Javier,
Any chance you filled up at a pump that has a single hose and
got either low grade fuel or Diesel or some other form of contaminant
in the tank?
-Joey
On Thu, Aug 26, 2010 at 11:23 AM, Javier Garcia <[email protected]> wrote:
> Kurt,
>
> yes, I guess it does makes sense. In any case I think I need to gather more
> information to make a consistent statistics of the behavior. All that I can
> say so far is that it actually feels to be the other way around. When I
> started having the issue yesterday, every subsequent start would be more
> difficult than the previous one. After letting it seat the whole night, this
> morning feels like the excess of gas is gone. Again, I am just bouncing
> ideas between my gigantic ignorance about engines and the lack of
> information about the symptom itself.
>
> Javier.
>
>
> On Thu, Aug 26, 2010 at 11:06 AM, Kurt Nolte <[email protected]>
> wrote:
>>
>> Javier,
>>
>> It could still work with the "leaking petcock diaphragm" theory. When
>> you let the bike sit for a while, a slow leak has a chance to put out
>> enough gas to cause a starting problem. Once that gas is dealt with by
>> your initial difficult start, subsequent starts without a long wait
>> will be "problemless" because the leak hasn't had a chance to move
>> enough gas.
>>
>> If you don't have the problem again when you go home from work
>> (several hours from now, unless I'm mistaken), then you indeed have a
>> somewhat confusing issue.
>>
>> It's possible that suddenly having to use the petcock more often could
>> have caused a small tear in your diaphragm... thus the sudden onset of
>> the problem without much warning.
>>
>> That help at all?
>>
>> -Kurt
>>
>> On Thu, Aug 26, 2010 at 10:39 AM, Javier Garcia <[email protected]>
>> wrote:
>> > Hi guys,
>> > thanks a lot for such educational answers. Now I am a bit more confused
>> > than
>> > yesterday. This morning I checked again for leaking. Nothing. Engine,
>> > parts,
>> > and garage floor all very clean. I went to start the same way I always
>> > do,
>> > no choke (at least not this time of the year), and no gas. It tried to
>> > fire
>> > up a couple of times, but not quite there yet. I had to give it a bit of
>> > gas
>> > and then went on. Just a bit rough at the beginning, but mostly from
>> > being
>> > cold. Putted my gear on and the bike is idleling perfect as usual. Took
>> > it
>> > outside and I turned off because I forgot something inside the house.
>> > Came
>> > back, hit the start, and fire up without giving any gas. Lucky I guess.
>> > Came
>> > to work, and I did not experience any of the symptoms from yesterday.
>> > Pulled
>> > over in the parking lot. Turned off. Hit start and it fired up
>> > immediately
>> > as usual. Tried 4 or 5 times consecutively. The same. The problem is
>> > gone.
>> >
>> > Now, according to the general consensus, the diaphram in the petcook
>> > could
>> > be responsable for this issue. How does this scenario fits now? I
>> > actually
>> > was thinking what I have done differently recently, and one thing is
>> > that
>> > since my speedometer cable broke, I cannot calculate the gas level, and
>> > thus
>> > now I wait until I am empty and I have to change to reserve to go to the
>> > station and fill up the tank. The difference now is that I am using the
>> > petcook more often, swiching between tank and reserve. Before, I pretty
>> > much
>> > never touched it.
>> >
>> > Could it be also that going to reserve I just picked up some dirt
>> > deposited
>> > at the bottom of the tank, and then when to the carbs. I guess I could
>> > try
>> > Seafoam as well, just as a sanity check.
>> > I will let you know how it behaves when I get off work.
>> >
>> > Thanks again for your opinions.
>> > Javier.
>> >
>> >
>> > On Thu, Aug 26, 2010 at 8:55 AM, Kurt Nolte <[email protected]>
>> > wrote:
>> >>
>> >> After that, start wondering about float valve seats. Well, if it still
>> >> gives you problems after you've made sure that the carburetors weren't
>> >> at some point adjusted for a slight fuel leak into the intake, that
>> >> is.
>> >>
>> >> On Thu, Aug 26, 2010 at 8:39 AM, [email protected]
>> >> <[email protected]> wrote:
>> >> > I agree with replacing the petcock diaphram, i would even go as far
>> >> > to
>> >> > not check it, just replace it.... After that look at your vac lines,
>> >> > then i
>> >> > dont know after that....
>> >> >
>> >> > Good luck
>> >> >
>> >> >
>> >> > -----Original Message-----
>> >> > Date: Thursday, August 26, 2010 6:40:24 am
>> >> > To: "Nighthawk Motorcycle Lovers!"
>> >> > <[email protected]>
>> >> > From: "jaybird248" <[email protected]>
>> >> > Subject: [Nighthawk Lovers] Re: Fuel related problem
>> >> >
>> >> > Javier, the reason you have to give it lots of throttle to start is
>> >> > that it's flooded. Opening the throttle lets in more air, diluting
>> >> > the
>> >> > accumulated gas to the proper mixture. Then the engine can fire up.
>> >> >
>> >> > I also had this symptom due to a torn petcock diaphragm.
>> >> >
>> >> > Jay S
>> >> > 92 NH750
>> >> > South Florida
>> >> >
>> >> > On Aug 26, 5:39 am, jaybird248 <[email protected]> wrote:
>> >> >> Absolutely check the petcock, as surfswab says. These symptoms are
>> >> >> exactly like what happened on my bike and it turned out to be a
>> >> >> small
>> >> >> hole worn in the diaphragm. When I replaced the defective unit, not
>> >> >> only did the symptoms clear up, my gas mileage went from the 40s
>> >> >> into
>> >> >> the 50s.
>> >> >>
>> >> >> Jay S
>> >> >> 92 NH750
>> >> >> South Florida
>> >> >>
>> >> >> quoted text -
>> >> >
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>> >> >
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