Gene, I was thinking about this; I agree that it is highly improbable that the needle valves would rot to the extent that fuel would bypass them to such a great extent. Here is another more plausable scenario. the torn diaphragm in the petcock could allow fuel to pass it and drain straight down the vacuume line directly into the #2 intake runner, bypassing the carb all together. this would fill the cylinder, and fuel would eventually drain past the rings into the crank case. If you started the bike in this condition it could hydrolock the engine. Even a little gas in the oil will destroy its viscosity, and prematurely wear the berrings and transmission gears. The reason I made such a strong warning is that I think this is a new member, and he may not be aware that this condition could occur. I'd hate to see another new member loose his bike prior to getting it on the road. Let me know your thoughts.
On Sat, Aug 14, 2010 at 6:13 PM, Allen Thomas <[email protected]> wrote: > I guess the problem would be that if the rubber in the diaphragm is rotted > to the point it leaks air then the rubber tips of the float needles could be > rotted enough to allow fuel past them. > > > On Sat, Aug 14, 2010 at 6:06 PM, Allen Thomas <[email protected]>wrote: > >> This forum isn't the only place where I have read that horror story >> either. >> >> >> On Sat, Aug 14, 2010 at 6:05 PM, Allen Thomas <[email protected]>wrote: >> >>> It shouldn't, but it obviously has for at least one member. >>> >>> >>> On Sat, Aug 14, 2010 at 6:03 PM, Gene Henry <[email protected]> wrote: >>> >>>> Will someone please explain to me why the float/needle(s) in the >>>> crab(s) does not stop the flow of fuel when the engine is not running, but >>>> does when it is running? >>>> 12" of head (height of the fuel column) = about 1/2 psi. The >>>> float/needle should handle that. ???????????????????? >>>> >>>> Inquiring minds want to know. >>>> >>>> Gene >>>> >>>> >>>> >>>> ----- Original Message ----- >>>> >>>> *From:* Allen Thomas <[email protected]> >>>> *To:* [email protected] >>>> *Sent:* Saturday, August 14, 2010 4:49 PM >>>> *Subject:* Re: [Nighthawk Lovers] Re: Digest for >>>> [email protected] - 13 Messages in 5 Topics >>>> >>>> Since you filled the tank, make sure you close the petcock when not >>>> running! otherwise you could fill the crankcase with gas, ruining your oil, >>>> and potentially destroy your engine or worse! >>>> >>>> On Sat, Aug 14, 2010 at 5:10 PM, surfswab <[email protected]> wrote: >>>> >>>>> > im thinking i will pull the petcock and clean it or replace it.< >>>>> >>>>> Good plan. You'll probly find the diaphragm rubber torn/worn out. It >>>>> keeps a fuel valve open when vacuum's applied (engine running) and >>>>> closes the valve in the absence of vacuum (engine not running). >>>>> >>>>> If it's malfunctioning, it allows raw gas to gravity feed to the float >>>>> bowls -- overflowing into the intake, cylinders, air box and >>>>> crankcase, causing a real mess. >>>>> >>>>> Rebuild kit's about $20. New petcock about $150. Add new plugs, new >>>>> oil, new air/oil filters and several hours of draining/mopping/sucking >>>>> raw gas/oil from everywhere it's not supposed to be. >>>>> >>>>> Don't ask me how I know all this. >>>>> >>>>> -- >>>>> 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]<nighthawk_lovers%[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]<nighthawk_lovers%[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]<nighthawk_lovers%[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.
