Re: [Nighthawk Lovers] Should I do the top end on my 1983 NH 650

[aajawo]

Thanks guys.  That seems like sound advice.

It was mostly the relatively low pressure on cylinder 2 (105 psi) that made 
me think I should tear into the top end.  But that seems to have remedied 
itself somehow.  Hopefully, it isn't an intermittent valve sealing issue.  
I'll keep an eye on it.

I'm still puzzled by the oily fluid that collects in the drain tube and 
airbox.  



On Sunday, November 10, 2019 at 6:45:43 AM UTC-7, kiwinPA wrote:
>
> Right on!
>
> On Sun, Nov 10, 2019 at 6:58 AM Donny Ravioli  > wrote:
>
>> 17k miles.Your readings are consistent across the for cylinders. And they 
>> are less than 10% below spec... I wouldn't even think about rebuilding it.
>>
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Re: [Nighthawk Lovers] Should I do the top end on my 1983 NH 650

[Graham Rogers]

Right on!

On Sun, Nov 10, 2019 at 6:58 AM Donny Ravioli  wrote:

> 17k miles.Your readings are consistent across the for cylinders. And they
> are less than 10% below spec... I wouldn't even think about rebuilding it.
>
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> .
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Re: [Nighthawk Lovers] Should I do the top end on my 1983 NH 650

[Donny Ravioli]

17k miles.Your readings are consistent across the for cylinders. And they are 
less than 10% below spec... I wouldn't even think about rebuilding it.

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Re: [Nighthawk Lovers] Should I do the top end on my 1983 NH 650

[aajawo]

Graham, it has 17,200 miles on it.

On Saturday, November 9, 2019 at 1:18:55 AM UTC-7, kiwinPA wrote:
>
> How many miles on your bike? Graham
>
> On Fri, Nov 8, 2019 at 11:13 PM aajawo > 
> wrote:
>
>> So I've been thinking about doing the top end on my 1983 Nighthawk 650 
>> for a few reasons.  The compression on all four cylinders is a little low 
>> at 120 psi.  That is tested with the engine warm and throttle wide open.  
>> The shop manual spec is 170 psi.  But, correcting for my elevation of 7,000 
>> feet, that would be more like about 134 psi.  So maybe 120 psi isn't too 
>> bad???  
>>
>> Also, I'm getting oil in the drain tube that comes off the separator tank 
>> attached to the the crankcase breather - maybe an inch of oil will collect 
>> over the course of a 50 mile ride (pictured). The airbox which is connected 
>> to the separator tank also has oil in it. My guess is that I am getting 
>> some blow by past the rings which is forcing vapors out the crankcase 
>> breather into the separator tank and airbox where they collect.
>>
>> The bike doesn't visibly smoke, but I can smell either oil or unburned 
>> gas when I let the bike idle in the garage.  
>>
>> The plugs don't look too bad - a little too brown maybe, but dry 
>> (pictured).
>>
>> Originally, the number 2 cylinder was only reading about 105 psi.  But 
>> now that all four cylinders are at 120 psi, I am having second thoughts 
>> about doing a top end.
>>
>> The top-end job would include a cylinder hone, new rings, lapping valves, 
>> new valve seals, new gaskets, and anything else I might run in to.
>>
>> I think I could do it myself.  I already have a top end gasket kit.  
>> Rings would be about $100.  As long as I don't run into other issues, the 
>> cost isn't too bad.
>>
>> What do y'all think?  Is it necessary?
>>
>>
>>
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>>  
>> 
>> .
>>
>

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Re: [Nighthawk Lovers] Should I do the top end on my 1983 NH 650

[Graham Rogers]

I agree.

On Sat, Nov 9, 2019 at 6:23 AM Dave duChêne  wrote:

> If it ain't broke don't fix it. Seriously, the numbers you provided don't
> indicate any issues. Just enjoy your ride.
> Dave
>
> On Sat, 9 Nov 2019 at 00:13, aajawo  wrote:
>
>> So I've been thinking about doing the top end on my 1983 Nighthawk 650
>> for a few reasons.  The compression on all four cylinders is a little low
>> at 120 psi.  That is tested with the engine warm and throttle wide open.
>> The shop manual spec is 170 psi.  But, correcting for my elevation of 7,000
>> feet, that would be more like about 134 psi.  So maybe 120 psi isn't too
>> bad???
>>
>> Also, I'm getting oil in the drain tube that comes off the separator tank
>> attached to the the crankcase breather - maybe an inch of oil will collect
>> over the course of a 50 mile ride (pictured). The airbox which is connected
>> to the separator tank also has oil in it. My guess is that I am getting
>> some blow by past the rings which is forcing vapors out the crankcase
>> breather into the separator tank and airbox where they collect.
>>
>> The bike doesn't visibly smoke, but I can smell either oil or unburned
>> gas when I let the bike idle in the garage.
>>
>> The plugs don't look too bad - a little too brown maybe, but dry
>> (pictured).
>>
>> Originally, the number 2 cylinder was only reading about 105 psi.  But
>> now that all four cylinders are at 120 psi, I am having second thoughts
>> about doing a top end.
>>
>> The top-end job would include a cylinder hone, new rings, lapping valves,
>> new valve seals, new gaskets, and anything else I might run in to.
>>
>> I think I could do it myself.  I already have a top end gasket kit.
>> Rings would be about $100.  As long as I don't run into other issues, the
>> cost isn't too bad.
>>
>> What do y'all think?  Is it necessary?
>>
>>
>> --
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>> "Nighthawk Motorcycle Lovers!" group.
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>> https://groups.google.com/d/msgid/nighthawk_lovers/d584d518-3f7d-40db-951d-131bc7880e0c%40googlegroups.com
>> 
>> .
>
>
>>
>
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> .
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Re: [Nighthawk Lovers] Should I do the top end on my 1983 NH 650

[Tommy Hill]

Maybe run a little Marvins Mystery Oil in it. 

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Re: [Nighthawk Lovers] Should I do the top end on my 1983 NH 650

[Dave duChêne]

If it ain't broke don't fix it. Seriously, the numbers you provided don't
indicate any issues. Just enjoy your ride.
Dave

On Sat, 9 Nov 2019 at 00:13, aajawo  wrote:

> So I've been thinking about doing the top end on my 1983 Nighthawk 650 for
> a few reasons.  The compression on all four cylinders is a little low at
> 120 psi.  That is tested with the engine warm and throttle wide open.  The
> shop manual spec is 170 psi.  But, correcting for my elevation of 7,000
> feet, that would be more like about 134 psi.  So maybe 120 psi isn't too
> bad???
>
> Also, I'm getting oil in the drain tube that comes off the separator tank
> attached to the the crankcase breather - maybe an inch of oil will collect
> over the course of a 50 mile ride (pictured). The airbox which is connected
> to the separator tank also has oil in it. My guess is that I am getting
> some blow by past the rings which is forcing vapors out the crankcase
> breather into the separator tank and airbox where they collect.
>
> The bike doesn't visibly smoke, but I can smell either oil or unburned gas
> when I let the bike idle in the garage.
>
> The plugs don't look too bad - a little too brown maybe, but dry
> (pictured).
>
> Originally, the number 2 cylinder was only reading about 105 psi.  But now
> that all four cylinders are at 120 psi, I am having second thoughts about
> doing a top end.
>
> The top-end job would include a cylinder hone, new rings, lapping valves,
> new valve seals, new gaskets, and anything else I might run in to.
>
> I think I could do it myself.  I already have a top end gasket kit.  Rings
> would be about $100.  As long as I don't run into other issues, the cost
> isn't too bad.
>
> What do y'all think?  Is it necessary?
>
>
> --
> You received this message because you are subscribed to the Google Groups
> "Nighthawk Motorcycle Lovers!" group.
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> https://groups.google.com/d/msgid/nighthawk_lovers/d584d518-3f7d-40db-951d-131bc7880e0c%40googlegroups.com
> 
> .
>


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Re: [Nighthawk Lovers] Should I do the top end on my 1983 NH 650

[Graham Rogers]

How many miles on your bike? Graham

On Fri, Nov 8, 2019 at 11:13 PM aajawo  wrote:

> So I've been thinking about doing the top end on my 1983 Nighthawk 650 for
> a few reasons.  The compression on all four cylinders is a little low at
> 120 psi.  That is tested with the engine warm and throttle wide open.  The
> shop manual spec is 170 psi.  But, correcting for my elevation of 7,000
> feet, that would be more like about 134 psi.  So maybe 120 psi isn't too
> bad???
>
> Also, I'm getting oil in the drain tube that comes off the separator tank
> attached to the the crankcase breather - maybe an inch of oil will collect
> over the course of a 50 mile ride (pictured). The airbox which is connected
> to the separator tank also has oil in it. My guess is that I am getting
> some blow by past the rings which is forcing vapors out the crankcase
> breather into the separator tank and airbox where they collect.
>
> The bike doesn't visibly smoke, but I can smell either oil or unburned gas
> when I let the bike idle in the garage.
>
> The plugs don't look too bad - a little too brown maybe, but dry
> (pictured).
>
> Originally, the number 2 cylinder was only reading about 105 psi.  But now
> that all four cylinders are at 120 psi, I am having second thoughts about
> doing a top end.
>
> The top-end job would include a cylinder hone, new rings, lapping valves,
> new valve seals, new gaskets, and anything else I might run in to.
>
> I think I could do it myself.  I already have a top end gasket kit.  Rings
> would be about $100.  As long as I don't run into other issues, the cost
> isn't too bad.
>
> What do y'all think?  Is it necessary?
>
>
>
> --
> You received this message because you are subscribed to the Google Groups
> "Nighthawk Motorcycle Lovers!" group.
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> 
> .
>

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