How To, Drain Bad Gas From your Motorcycle and test your petcock If you have a carbureted motorcycle. You will need to get the bad gas out of your tank. Chances are, if you’ve been running bad gas through your fuel system, there’s residual gunk left inside the tank that could cause fuel delivery problems. That will cause a bad running motorcycle. This will work on vacuum petcocks on Honda, Yamaha, Suzuki and Harley Davidson carbureted Motorcycles. It is always a great idea to have fresh gas and a fully charge battery before you try to start your stored motorcycle.

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