Engine problem - What to try next?
#41
Thank you for the info!
Last edited by MM900RR; 03-16-2019 at 12:15 AM.
#42
#43
It's just so puzzling how fuel could flow from the tank, through the filter, pump, and carbs, and fill up the intake tract (guessing close to 1/2 liter or more per cylinder).... just sitting, key off. And it was all carbs (well, 1, 3 & 4... guessing #2 as well, but couldn't tell since intake valves were open.) I'm really being taught a lesson to not let my bike sit for 15 years aren't I?
#44
One thing now is you know your getting too much fuel at the carbs, if floats ,jets and pilots screws are correct , we have to look at outside forces , that leaves the pump, is it a new one or existing, if the pump is running all the time it will force more into the bowls ,in the same case if its letting fuel pass then its faulty, try the method in #42 just to see
#45
Perhaps the original needle valves are sticky from being aged, allowing only a slowing filling bowl (maybe even starving the needle jet when throttle is opened, hence little to no response), and now they are stuck open.
I'll replace them with new tomorrow... see what happens.
I'll replace them with new tomorrow... see what happens.
Last edited by MM900RR; 03-16-2019 at 02:31 AM.
#46
One thing now is you know your getting too much fuel at the carbs, if floats ,jets and pilots screws are correct , we have to look at outside forces , that leaves the pump, is it a new one or existing, if the pump is running all the time it will force more into the bowls ,in the same case if its letting fuel pass then its faulty, try the method in #42 just to see
But I think you're correct... it should not allow fuel to pass through it when it's not pumping (or not powered.) I was going to replace it just for good measure (regardless if it seemed to be working), but those OEM pumps are expensive! Nevertheless, I'm running out of things to blame...so pump is next.
#48
#50
Just reread my 'theory' regarding possibly stuck float needles... that made no sense. (Note to self, don't post late at night.) I was confusing float needle and jet needle. If the float needle was stuck closed.. float bowl would be empty. No fuel for anything. Only way to get fuel through just the idle circuit (that I can think of late at night), is if main jet was clogged...which it definitely isn't. So scratch that theory. (Although stuck open could explain the flood of fuel in the intake.) Editing that post so I sound a bit less ignorant.
Last edited by MM900RR; 03-16-2019 at 02:32 AM.