Quote:
Originally Posted by xlint89
OK guys, this one has me puzzled.
Yerfdog with the Howhit 150 and Mikuni VM 26-606 carb.
After you make a WOT run and let off the gas (fully closed) the RPMs start to decline as normal. But as it starts to come around 3000 RPM, bubbles form inside the fuel filter, and it actually forces the fuel back inside the fuel tank. And there it stays until you kill the engine or fiddle around with it until the pressure releases.
My overflow tube is not clogged. I checked that, and occaisionally because of this problem, I have fuel forced out of that hose.
The fuel tank vent is not clogged. I can actually remove the fuel tank cap, and it does not change anything.
I know about reversion on motorcycles, but I have not heard it mentioned on these before. But even still, with the overflow being clear (and venting the carb bowl), how does it build up pressure inside the carb and force the fuel back into the tank????
Like I said, weird.......
And I can get a video of it once I charge the batteries.
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That's a new one on me...sounds like a vapor lock. What kind of intake manifold are you running? cam? anything, non-stock we should know about? Hva you had the cam out recently?
just grabbing at straws for any info that might suggest an intelligent answer.
