BIKE RUNNING LEAN?

[monster malibu]

Hey guys, I rebuilt my 500's topend and blewout the paper base gasket. While replacing the paper base gasket, I couldn't help but notice the piston top was hardly discolored and not black like I thought it should be. I've never messed with jetting before, but doesn't this sound like the bikes running lean?  I'm not sure what jets are in the carb and don't know where to start to fix my problem. I do know I don't want to burn my bike down after JUST rebuilding the topend.

[don46]

When your base gasket blew, it caused the bike to run leaner. After you replace the gasket you can do some jetting if needed.

[monster malibu]

I didn't think of that Don after I run the bike tomorrow I'll pull the plug and see what color it is. Thanks for the reply.

[FactoryPhil]

It also takes quite a few hours of hard running before the piston starts to collect carbon. That's why some two strokes that are not racing oriented require periodic decarbonizing of the piston and cylinder head after a certain number of hours.