2002 blaster.full dg pipes. rad valve reeds,.50mm over bore. stock jets...put the bike together borke it in..ran great other than super fast idol. carb adjustments did not slow it down. about 6 hours on new top end and the stupid piston melts! is this a jetting problem?

 

You are running lean, either not enough fuel or too much air, or a combination of both. You could be sucking air from somewhere like from a bad seal at the base cylinder gasket or reed valve gasket which could also cause it to idle high.

 

Your gas/oil mixture could be off as well. If you are not running enough oil, you will get some meltage.

 

replaced the base cylinder gasket,and head gasket,reed valve seet...running 42:1 pre mix. do u think it might be the crank case leaking?

 

Maybe but I would bet your problem is you are just to lean. With pipes, reeds, and larger piston there is no way you should be running stock jetting.

 

We had a problem just like the one listed here. It ended up being a broke engine case that was sucking air and wouldn't let it idle down. I agree with the post above that with all the work stock jets are not probably good enough, but I am not sure that would affect your idle. Usually when it will not idle down there is an air leak somewhere.

 

can any one sudgest a kit or some sizes on jets?

 

45 piolet 260 main

 

With the overbore, aftermarket pipe and new reeds I bet your running very lean with stock jets.
Definatly check all conections and make sure everything is sealed correctly, but I'd bump the jets up maybe 2 sizes and work your way down. Always better to be rich than lean.

What mods have you done to the intake? Aftermarket filter? open airbox?

 

i have a dynojet stage 2 jet kit on my blaster with the biggest main jet i think its a 360 main the direction that come with it will tell you what to use