My petcock broke....

Careful.

Yeah I use very nicely machined ball valve. Feels very heavy duty. I love it.

Here's the weird part. This new ball valve, actually works as a valve. Turn it on, fuel flows mightily, filter fills up with fuel, etc. Turn it off, fuel stops. So you ask what the heck is so wrong with that. Well nothing, but the old valve just about peed like a 97 yo guy with prostate problems....just sorta dribbled and got worse with life....must of had a leak and an obstruction!

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Here's what I have now:

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My engine is now running rich.

Is this even plausible? My plug looks rich, engine sounds and runs rich…. At mid and fuel throttle. I had the thing running nearly PERFECT before.

The fuel flow through this thing like a fire hose! I guess I never thought much about how bad the old valve was (until it snapped) - BTW I never used the POS intank screen and my plastic "VW" clear fuel filter has caught a good amount of crud. Now here's the weird part, the filter would only be 1/2 full of fuel at best when the bike was new and got worse with time. Recently the filter just would have just a tiny amount of fuel in it - enough to run really great with zero problems. Change the valve and it runs rich....I don't understand why. Maybe the fuel flow was metered by the valve not the carb that just sounds whacked…..

Input?

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since it's a gravity-fed carb, it's not unlikely to think that you have more fuel flowing with the ability to flow more quickly, thus exerting more force on the carb i.e. higher fuel pressure.

Yeah maybe more fuel blows by the float needle valve. It ran OK last even just had some funky rich throttle stuff going on. I will adjust the needle tonight.

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The gravity of the fuel would not make a difference unless the float valve wasn't sealing, and then only if your fuel flow was about 5% of what it is now. The float valve shuts off fuel flow when the chamber is full.

Maybe you have a float leak?

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If it ain't broke, and you mess with it long enough, it will be.

No float leak - but my fuel flow was very minimal before.

Lemme ask this - when the stock fuel petcock is removed and dry - when open it should have very little flow impediment and: Can you see light through it?

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I can't see a thing through it....

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If it ain't broke, and you mess with it long enough, it will be.

Thanks....I'm gonna mess with the dead fuel soaked one this weekend when I'm playing with fire......

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Dude - it runs great now!!

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