The stock petcock is a terrible design once you try a petcock from Sick Bike Parts! They call it a Precision Fuel Petcock with Barb (Item # SBP-FV007) for $9.95. It is the best $10 I have spent so far on my bike. Paul, the man in charge of sales, spent 30 minutes on the phone with me teaching me how to properly apply some teflon paste so insure to leaks and offered me further support whenever I need it! Try it; you will be satisfied!
Love / hate thing for sure. But the tinkering and learning is part of the beauty too. When ever possible, I replace the lil WTFs (Things that break at the worst possible time) with ATV or dirt bike parts. They are made to put up with a lot more then a MB can do so outlive any 3 engines. It costs a great deal more $, but I never have to worry about that part again. That and they look like overkill.I think I'll look at some motorcycle parts tomorrow to see if they work with the engine: My clutch lever spring popped out when I was riding in front of my house tonight.
In spite of all these little irritations, I really love this bike! I already have my next build planned, all I have to do is save up around a thousand bucks.
Not sure if this is usual: the petcock is right at the tank. If I don't ride for a few days , the fuel in line has dropped about 1 inch. So the fuel drained into the carb..I'd like to put another petcock where the fuel line enters the carb. Has anyone noticed this drainage prob, and moved or added another pc?