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 - >> > >> > -- >> > You received this message because you are subscribed to the Google >> > Groups "Nighthawk Motorcycle Lovers!" group. >> > To post to this group, send email to [email protected]. >> > To unsubscribe from this group, send email to >> > [email protected]. >> > For more options, visit this group at >> > http://groups.google.com/group/nighthawk_lovers?hl=en. >> > >> > >> > >> > -- >> > You received this message because you are subscribed to the Google >> > Groups "Nighthawk Motorcycle Lovers!" group. >> > To post to this group, send email to [email protected]. >> > To unsubscribe from this group, send email to >> > [email protected]. >> > For more options, visit this group at >> > http://groups.google.com/group/nighthawk_lovers?hl=en. >> > >> > >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Nighthawk Motorcycle Lovers!" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/nighthawk_lovers?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/nighthawk_lovers?hl=en. > -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en.
