I have been battling a weird hanging idle with my hobbit for quite awhile,
after much trial and error, realized the culprit was the used 19phbg's warped float bowl and gasket. It's Jetted spot on, and would be fixed for a few weeks after using Yamabond on the gasket, but then with any removal of the bowl the problem would resurface. Stupid hanging idle again.
There was no fuel spilling out of the bowl at all.
Today I really dove into the project and noticed how very warped the bowl was. I sanded it down on some flat marble to be very flat, made a new gasket and it ran fantastic, no idle hang, consistently returning to idle quickly after a high speed run.
Here's the question.
With no fuel spilling out of the bowl, I'm assuming that I had an air leak that was sucking in air in to the bowl. How would this cause the hanging idle I had? I thought since the float bowl was vented already that an air leak couldn't be the issue, and the gasket was just there to keep fuel from spilling out....
So what gives? Air bubbles in the gas in the bowl causing weirdness?
A vacuum issue (air or fuel or both?) causing the motor to not pull fuel at low vacuum? please enlighten me.