Re: [Nighthawk Lovers] 1985 cb650sc runs poorly at high rpm

[Graham Rogers]

Ok, heres what I have on my 700S. There are two hoses going into the
cannister. One from the valve cover and the other from the top of the
crankcase. A third hose goes from the cannister to the airbox. Pretty
simple.
By the way have you checked the air filter?  If it is real dirty or oiled
up it will starve the carbs of air and the engine will fade at higher RPMs.
If the plugs are black and or sooty that could mean its starved for air
and/or carb issues.
Graham


On Tue, Feb 20, 2018 at 6:22 PM  wrote:

> ok
>
> On Tuesday, February 20, 2018 at 12:24:27 PM UTC-8, kiwinPA wrote:
>
>> Let me think about it a bit
>>  I don't have a 650 anymore just a 700S which has the CA EPA canister on
>> it. Ill check it when I get home
>>
> On Feb 20, 2018 3:19 PM,  wrote:
>>
> Kiwi does that change anything you stated before about the hoses being run
>>> to and from the charcoal canister from everything I can tell it seems to be
>>> a California model but I can't see any designation of that nor can I find
>>> the Pcv valve I have the Haynes manual and it says the two hoses running
>>> out of the canister one goes to the Pcv valve which I can't seem to locate
>>> and one goes to the fuel tank for fuel vapor emissions etc.  So the two
>>> going into the canister is one the crankcase breather and the other the
>>> valve cover ?  Sorry to be hungup on this your the only one I've talked
>>> online who seems to be knowledgeable on the subject I'm interested in
>>> keeping the bike stock.  But I'm guessing what your saying is it should
>>> still run decent if the carbs are working properly no matter how the hoses
>>> are run.
>>>
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Re: [Nighthawk Lovers] 1985 cb650sc runs poorly at high rpm

[gavintrades7]

ok 

On Tuesday, February 20, 2018 at 12:24:27 PM UTC-8, kiwinPA wrote:
>
> Let me think about it a bit
>  I don't have a 650 anymore just a 700S which has the CA EPA canister on 
> it. Ill check it when I get home
>
> On Feb 20, 2018 3:19 PM,  wrote:
>
>> Kiwi does that change anything you stated before about the hoses being 
>> run to and from the charcoal canister from everything I can tell it seems 
>> to be a California model but I can't see any designation of that nor can I 
>> find the Pcv valve I have the Haynes manual and it says the two hoses 
>> running out of the canister one goes to the Pcv valve which I can't seem to 
>> locate and one goes to the fuel tank for fuel vapor emissions etc.  So the 
>> two going into the canister is one the crankcase breather and the other the 
>> valve cover ?  Sorry to be hungup on this your the only one I've talked 
>> online who seems to be knowledgeable on the subject I'm interested in 
>> keeping the bike stock.  But I'm guessing what your saying is it should 
>> still run decent if the carbs are working properly no matter how the hoses 
>> are run.
>>
>> --
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>> "Nighthawk Motorcycle Lovers!" group.
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Re: [Nighthawk Lovers] 1985 cb650sc runs poorly at high rpm

[Graham Rogers]

Let me think about it a bit
 I don't have a 650 anymore just a 700S which has the CA EPA canister on
it. Ill check it when I get home

On Feb 20, 2018 3:19 PM,  wrote:

> Kiwi does that change anything you stated before about the hoses being run
> to and from the charcoal canister from everything I can tell it seems to be
> a California model but I can't see any designation of that nor can I find
> the Pcv valve I have the Haynes manual and it says the two hoses running
> out of the canister one goes to the Pcv valve which I can't seem to locate
> and one goes to the fuel tank for fuel vapor emissions etc.  So the two
> going into the canister is one the crankcase breather and the other the
> valve cover ?  Sorry to be hungup on this your the only one I've talked
> online who seems to be knowledgeable on the subject I'm interested in
> keeping the bike stock.  But I'm guessing what your saying is it should
> still run decent if the carbs are working properly no matter how the hoses
> are run.
>
> --
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Re: [Nighthawk Lovers] 1985 cb650sc runs poorly at high rpm

[gavintrades7]

Kiwi does that change anything you stated before about the hoses being run to 
and from the charcoal canister from everything I can tell it seems to be a 
California model but I can't see any designation of that nor can I find the Pcv 
valve I have the Haynes manual and it says the two hoses running out of the 
canister one goes to the Pcv valve which I can't seem to locate and one goes to 
the fuel tank for fuel vapor emissions etc.  So the two going into the canister 
is one the crankcase breather and the other the valve cover ?  Sorry to be 
hungup on this your the only one I've talked online who seems to be 
knowledgeable on the subject I'm interested in keeping the bike stock.  But I'm 
guessing what your saying is it should still run decent if the carbs are 
working properly no matter how the hoses are run.

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Re: [Nighthawk Lovers] 1985 cb650sc runs poorly at high rpm

[Graham Rogers]

The color of the plugs will tell you alot. 16k miles is not much. If you
can give the bike a compression test that would be good.
The loop, for sake of a better word is just a metal ring through which the
hose from the air box and the clear battery breather tube are channeled to
the bottom outside of the bike. I cant think of an outlet/vent from the
crankcase. Any vent would blow oil out. You cant have that. Gases are
vented out the valve cover and the air box. It sounds like you have the CA
canister which is between the valve cover tand the air box.
, Feb 19, 2018 at 9:35 PM  wrote:

> I will check the plugs asap and get back to you I never took them out to
> check yet
>
> Sean
>
> On Monday, February 19, 2018 at 5:31:21 PM UTC-8, kiwinPA wrote:
>
>> Easier to work with you but you're too far away.  So a few questions.
>> How many miles on the bike?
>> Are the spark plugs sooted up, black, grey, white or what?  Check them
>> The carbs need taken apart and cleaned at least. As with the hoses. One
>> from the cannister goes to the valve cover. The two overflow hoses are open
>> ended, they hang down behind the carbs in front of the air box. There
>> should be one running from the bottom of the crankcase down. It has a plug
>> in it. Theres a loop for it to run through? That one is for junk, oil,
>> moisture that accumulates in of the air-box. It needs to be drained now and
>> then by removing the plug. Without it however, it shouldnt affect
>> performance. Your poor performance is at least due to the carbs needing
>> cleaning and if youve done some JB Welding in the bowls it sounds like the
>> fuel levels are off.
>> If you are interested in another set of carbs, let me know. I think i may
>> have a set around here, Graham
>>
>>
>>  Mon, Feb 19, 2018 at 7:55 PM  wrote:
>>
>>> new hampshire
>>>
>>>
>>> On Monday, February 19, 2018 at 3:59:51 PM UTC-8, kiwinPA wrote:
>>>

 Where are you?

>>>
 On Mon, Feb 19, 2018 at 6:52 PM  wrote:

>>> Hello guys hope someone on here can help me.  I bought a 1985 honda
> cb650sc for 300 dollars last year that had been sitting on someone's lawn
> for three years.  Bike started no problem when i got it home but leaked
> fuel profusely out of the bottom of the carb bowls.  I took the bowls 
> apart
> and fixed the leak but like a true amateur I forgot how the hoses were
> run.  When i say hoses I mean all the hoses.  Can anyone tell me beyond a
> reasonable doubt how they are all supposed to be run.  Currently the hose
> that comes off the crankcase is run to the charcoal canister and that is
> about it.  There is another spot of on the canister for another tube that
> is missing. Also there is a nipple on the bottom of the air box that
> doesn't have a hose run to it.  As well as the overflow t's between the 1
> and 2 carb and 3 and 4 are not run to anything.  Ive looked up lots of
> information and seen pictures but nothing that definitively tells how they
> are run. I know these old bikes can be finicky and best left stock and 
> that
> is how I would like to keep mine.  Running the bike without touching
> anything and leaking carbs I could easily cruise at 80-100 mph now the 
> bike
> gets up to about 60 mph and bogs out.  Other than that I have no other
> issues starts easily warms up idles etc.  Im thinking either I messed with
> important hoses or the large amount of jb weld I put in the float bowl
> housing to keep it from leaking disrupted the tune and it won't run right
> until I buy ones in better condition.  Any help would be greatly
> appreciated I want to get the most out of the bike this upcoming riding
> season
>
> --
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Re: [Nighthawk Lovers] 1985 cb650sc runs poorly at high rpm

[Tommy Hill]

I had a vaguely similar problem and it turned out to be some vent openings in 
the top of the carb bowls.  If you take apart to clean, check those, to.  Plugs 
sound quite possible and cheap and easy.

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Re: [Nighthawk Lovers] 1985 cb650sc runs poorly at high rpm

[gavintrades7]

I will check the plugs asap and get back to you I never took them out to 
check yet

Sean 

On Monday, February 19, 2018 at 5:31:21 PM UTC-8, kiwinPA wrote:

>
> Easier to work with you but you're too far away.  So a few questions.
> How many miles on the bike?
> Are the spark plugs sooted up, black, grey, white or what?  Check them
> The carbs need taken apart and cleaned at least. As with the hoses. One 
> from the cannister goes to the valve cover. The two overflow hoses are open 
> ended, they hang down behind the carbs in front of the air box. There 
> should be one running from the bottom of the crankcase down. It has a plug 
> in it. Theres a loop for it to run through? That one is for junk, oil, 
> moisture that accumulates in of the air-box. It needs to be drained now and 
> then by removing the plug. Without it however, it shouldnt affect 
> performance. Your poor performance is at least due to the carbs needing 
> cleaning and if youve done some JB Welding in the bowls it sounds like the 
> fuel levels are off. 
> If you are interested in another set of carbs, let me know. I think i may 
> have a set around here, Graham
>
>
>  Mon, Feb 19, 2018 at 7:55 PM  wrote:
>
>> new hampshire
>>
>>
>> On Monday, February 19, 2018 at 3:59:51 PM UTC-8, kiwinPA wrote:
>>
>>>
>>> Where are you?
>>>
>>
>>> On Mon, Feb 19, 2018 at 6:52 PM  wrote:
>>>
>> Hello guys hope someone on here can help me.  I bought a 1985 honda 
 cb650sc for 300 dollars last year that had been sitting on someone's lawn 
 for three years.  Bike started no problem when i got it home but leaked 
 fuel profusely out of the bottom of the carb bowls.  I took the bowls 
 apart 
 and fixed the leak but like a true amateur I forgot how the hoses were 
 run.  When i say hoses I mean all the hoses.  Can anyone tell me beyond a 
 reasonable doubt how they are all supposed to be run.  Currently the hose 
 that comes off the crankcase is run to the charcoal canister and that is 
 about it.  There is another spot of on the canister for another tube that 
 is missing. Also there is a nipple on the bottom of the air box that 
 doesn't have a hose run to it.  As well as the overflow t's between the 1 
 and 2 carb and 3 and 4 are not run to anything.  Ive looked up lots of 
 information and seen pictures but nothing that definitively tells how they 
 are run. I know these old bikes can be finicky and best left stock and 
 that 
 is how I would like to keep mine.  Running the bike without touching 
 anything and leaking carbs I could easily cruise at 80-100 mph now the 
 bike 
 gets up to about 60 mph and bogs out.  Other than that I have no other 
 issues starts easily warms up idles etc.  Im thinking either I messed with 
 important hoses or the large amount of jb weld I put in the float bowl 
 housing to keep it from leaking disrupted the tune and it won't run right 
 until I buy ones in better condition.  Any help would be greatly 
 appreciated I want to get the most out of the bike this upcoming riding 
 season 

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Re: [Nighthawk Lovers] 1985 cb650sc runs poorly at high rpm

[gavintrades7]

The bike has 16k miles on it.  I had the carbs complete apart and cleaned 
them up so I'm thinking it might be like you said the fuel levels are off 
because of how much jb weld I had to put in there to stop the leak.  I will 
start by taking the hoses off and cleaning them etc.  What do you mean when 
you said  by a loop for it to run though?  Does one of those hoses connect 
to the air box from the crankcase loop?   I just found stuff out about that 
tonight.  I think one of the hoses from the crankcase got in advertently 
bent or kinked because I have the classic case of oil leaking out of the 
shifter from blowing out the seal due to excess crankcase pressure.If 
you have another set of carbs I would love to buy them off of you.  Thanks 
a lot for you knowledge I must have spend hours and hours tinkering with 
the bike all last summer trying to get it to be roadworthy overall not a 
bad bike and even in the state of disrepair it always starts up pretty much 
all original.  

On Monday, February 19, 2018 at 5:31:21 PM UTC-8, kiwinPA wrote:
>
>
> Easier to work with you but you're too far away.  So a few questions.
> How many miles on the bike?
> Are the spark plugs sooted up, black, grey, white or what?  Check them
> The carbs need taken apart and cleaned at least. As with the hoses. One 
> from the cannister goes to the valve cover. The two overflow hoses are open 
> ended, they hang down behind the carbs in front of the air box. There 
> should be one running from the bottom of the crankcase down. It has a plug 
> in it. Theres a loop for it to run through? That one is for junk, oil, 
> moisture that accumulates in of the air-box. It needs to be drained now and 
> then by removing the plug. Without it however, it shouldnt affect 
> performance. Your poor performance is at least due to the carbs needing 
> cleaning and if youve done some JB Welding in the bowls it sounds like the 
> fuel levels are off. 
> If you are interested in another set of carbs, let me know. I think i may 
> have a set around here, Graham
>
>
>  Mon, Feb 19, 2018 at 7:55 PM  wrote:
>
>> new hampshire
>>
>>
>> On Monday, February 19, 2018 at 3:59:51 PM UTC-8, kiwinPA wrote:
>>
>>>
>>> Where are you?
>>>
>>
>>> On Mon, Feb 19, 2018 at 6:52 PM  wrote:
>>>
>> Hello guys hope someone on here can help me.  I bought a 1985 honda 
 cb650sc for 300 dollars last year that had been sitting on someone's lawn 
 for three years.  Bike started no problem when i got it home but leaked 
 fuel profusely out of the bottom of the carb bowls.  I took the bowls 
 apart 
 and fixed the leak but like a true amateur I forgot how the hoses were 
 run.  When i say hoses I mean all the hoses.  Can anyone tell me beyond a 
 reasonable doubt how they are all supposed to be run.  Currently the hose 
 that comes off the crankcase is run to the charcoal canister and that is 
 about it.  There is another spot of on the canister for another tube that 
 is missing. Also there is a nipple on the bottom of the air box that 
 doesn't have a hose run to it.  As well as the overflow t's between the 1 
 and 2 carb and 3 and 4 are not run to anything.  Ive looked up lots of 
 information and seen pictures but nothing that definitively tells how they 
 are run. I know these old bikes can be finicky and best left stock and 
 that 
 is how I would like to keep mine.  Running the bike without touching 
 anything and leaking carbs I could easily cruise at 80-100 mph now the 
 bike 
 gets up to about 60 mph and bogs out.  Other than that I have no other 
 issues starts easily warms up idles etc.  Im thinking either I messed with 
 important hoses or the large amount of jb weld I put in the float bowl 
 housing to keep it from leaking disrupted the tune and it won't run right 
 until I buy ones in better condition.  Any help would be greatly 
 appreciated I want to get the most out of the bike this upcoming riding 
 season 

 -- 
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Re: [Nighthawk Lovers] 1985 cb650sc runs poorly at high rpm

[Graham Rogers]

Easier to work with you but you're too far away.  So a few questions.
How many miles on the bike?
Are the spark plugs sooted up, black, grey, white or what?  Check them
The carbs need taken apart and cleaned at least. As with the hoses. One
from the cannister goes to the valve cover. The two overflow hoses are open
ended, they hang down behind the carbs in front of the air box. There
should be one running from the bottom of the crankcase down. It has a plug
in it. Theres a loop for it to run through? That one is for junk, oil,
moisture that accumulates in of the air-box. It needs to be drained now and
then by removing the plug. Without it however, it shouldnt affect
performance. Your poor performance is at least due to the carbs needing
cleaning and if youve done some JB Welding in the bowls it sounds like the
fuel levels are off.
If you are interested in another set of carbs, let me know. I think i may
have a set around here, Graham


 Mon, Feb 19, 2018 at 7:55 PM  wrote:

> new hampshire
>
>
> On Monday, February 19, 2018 at 3:59:51 PM UTC-8, kiwinPA wrote:
>
>>
>> Where are you?
>>
>
>> On Mon, Feb 19, 2018 at 6:52 PM  wrote:
>>
> Hello guys hope someone on here can help me.  I bought a 1985 honda
>>> cb650sc for 300 dollars last year that had been sitting on someone's lawn
>>> for three years.  Bike started no problem when i got it home but leaked
>>> fuel profusely out of the bottom of the carb bowls.  I took the bowls apart
>>> and fixed the leak but like a true amateur I forgot how the hoses were
>>> run.  When i say hoses I mean all the hoses.  Can anyone tell me beyond a
>>> reasonable doubt how they are all supposed to be run.  Currently the hose
>>> that comes off the crankcase is run to the charcoal canister and that is
>>> about it.  There is another spot of on the canister for another tube that
>>> is missing. Also there is a nipple on the bottom of the air box that
>>> doesn't have a hose run to it.  As well as the overflow t's between the 1
>>> and 2 carb and 3 and 4 are not run to anything.  Ive looked up lots of
>>> information and seen pictures but nothing that definitively tells how they
>>> are run. I know these old bikes can be finicky and best left stock and that
>>> is how I would like to keep mine.  Running the bike without touching
>>> anything and leaking carbs I could easily cruise at 80-100 mph now the bike
>>> gets up to about 60 mph and bogs out.  Other than that I have no other
>>> issues starts easily warms up idles etc.  Im thinking either I messed with
>>> important hoses or the large amount of jb weld I put in the float bowl
>>> housing to keep it from leaking disrupted the tune and it won't run right
>>> until I buy ones in better condition.  Any help would be greatly
>>> appreciated I want to get the most out of the bike this upcoming riding
>>> season
>>>
>>> --
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>>> Groups "Nighthawk Motorcycle Lovers!" group.
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>> To unsubscribe from this group and stop receiving emails from it, send an
>>> email to nighthawk_love...@googlegroups.com.
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>>>
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Re: [Nighthawk Lovers] 1985 cb650sc runs poorly at high rpm

[gavintrades7]

new hampshire

On Monday, February 19, 2018 at 3:59:51 PM UTC-8, kiwinPA wrote:
>
>
> Where are you?
>
> On Mon, Feb 19, 2018 at 6:52 PM  wrote:
>
>> Hello guys hope someone on here can help me.  I bought a 1985 honda 
>> cb650sc for 300 dollars last year that had been sitting on someone's lawn 
>> for three years.  Bike started no problem when i got it home but leaked 
>> fuel profusely out of the bottom of the carb bowls.  I took the bowls apart 
>> and fixed the leak but like a true amateur I forgot how the hoses were 
>> run.  When i say hoses I mean all the hoses.  Can anyone tell me beyond a 
>> reasonable doubt how they are all supposed to be run.  Currently the hose 
>> that comes off the crankcase is run to the charcoal canister and that is 
>> about it.  There is another spot of on the canister for another tube that 
>> is missing. Also there is a nipple on the bottom of the air box that 
>> doesn't have a hose run to it.  As well as the overflow t's between the 1 
>> and 2 carb and 3 and 4 are not run to anything.  Ive looked up lots of 
>> information and seen pictures but nothing that definitively tells how they 
>> are run. I know these old bikes can be finicky and best left stock and that 
>> is how I would like to keep mine.  Running the bike without touching 
>> anything and leaking carbs I could easily cruise at 80-100 mph now the bike 
>> gets up to about 60 mph and bogs out.  Other than that I have no other 
>> issues starts easily warms up idles etc.  Im thinking either I messed with 
>> important hoses or the large amount of jb weld I put in the float bowl 
>> housing to keep it from leaking disrupted the tune and it won't run right 
>> until I buy ones in better condition.  Any help would be greatly 
>> appreciated I want to get the most out of the bike this upcoming riding 
>> season 
>>
>> -- 
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>> "Nighthawk Motorcycle Lovers!" group.
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>> .
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>>
>

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Re: [Nighthawk Lovers] 1985 cb650sc runs poorly at high rpm

[Graham Rogers]

Where are you?

On Mon, Feb 19, 2018 at 6:52 PM  wrote:

> Hello guys hope someone on here can help me.  I bought a 1985 honda
> cb650sc for 300 dollars last year that had been sitting on someone's lawn
> for three years.  Bike started no problem when i got it home but leaked
> fuel profusely out of the bottom of the carb bowls.  I took the bowls apart
> and fixed the leak but like a true amateur I forgot how the hoses were
> run.  When i say hoses I mean all the hoses.  Can anyone tell me beyond a
> reasonable doubt how they are all supposed to be run.  Currently the hose
> that comes off the crankcase is run to the charcoal canister and that is
> about it.  There is another spot of on the canister for another tube that
> is missing. Also there is a nipple on the bottom of the air box that
> doesn't have a hose run to it.  As well as the overflow t's between the 1
> and 2 carb and 3 and 4 are not run to anything.  Ive looked up lots of
> information and seen pictures but nothing that definitively tells how they
> are run. I know these old bikes can be finicky and best left stock and that
> is how I would like to keep mine.  Running the bike without touching
> anything and leaking carbs I could easily cruise at 80-100 mph now the bike
> gets up to about 60 mph and bogs out.  Other than that I have no other
> issues starts easily warms up idles etc.  Im thinking either I messed with
> important hoses or the large amount of jb weld I put in the float bowl
> housing to keep it from leaking disrupted the tune and it won't run right
> until I buy ones in better condition.  Any help would be greatly
> appreciated I want to get the most out of the bike this upcoming riding
> season
>
> --
> You received this message because you are subscribed to the Google Groups
> "Nighthawk Motorcycle Lovers!" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to nighthawk_lovers+unsubscr...@googlegroups.com.
> To post to this group, send email to nighthawk_lovers@googlegroups.com.
> Visit this group at https://groups.google.com/group/nighthawk_lovers.
> For more options, visit https://groups.google.com/d/optout.
>

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[Nighthawk Lovers] 1985 cb650sc runs poorly at high rpm

[gavintrades7]

Hello guys hope someone on here can help me.  I bought a 1985 honda cb650sc 
for 300 dollars last year that had been sitting on someone's lawn for three 
years.  Bike started no problem when i got it home but leaked fuel 
profusely out of the bottom of the carb bowls.  I took the bowls apart and 
fixed the leak but like a true amateur I forgot how the hoses were run.  
When i say hoses I mean all the hoses.  Can anyone tell me beyond a 
reasonable doubt how they are all supposed to be run.  Currently the hose 
that comes off the crankcase is run to the charcoal canister and that is 
about it.  There is another spot of on the canister for another tube that 
is missing. Also there is a nipple on the bottom of the air box that 
doesn't have a hose run to it.  As well as the overflow t's between the 1 
and 2 carb and 3 and 4 are not run to anything.  Ive looked up lots of 
information and seen pictures but nothing that definitively tells how they 
are run. I know these old bikes can be finicky and best left stock and that 
is how I would like to keep mine.  Running the bike without touching 
anything and leaking carbs I could easily cruise at 80-100 mph now the bike 
gets up to about 60 mph and bogs out.  Other than that I have no other 
issues starts easily warms up idles etc.  Im thinking either I messed with 
important hoses or the large amount of jb weld I put in the float bowl 
housing to keep it from leaking disrupted the tune and it won't run right 
until I buy ones in better condition.  Any help would be greatly 
appreciated I want to get the most out of the bike this upcoming riding 
season 

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