Ok the jetting is right on and the plug looks really good but I will try to put a new one in. Oh does anyone happend to know what the compresion is suppost to be so I can do a test?/ thanks.

 

Does anyone know what the compression should be?? Or would it be differant since I have a weisco piston, rings and a sleeve?? So can anyone tell me at least a close estimate of the compression? thanks.

 

Anything below about 90-95 is in need of a rebuild. 115-120 should be about right for a stock bike. Well at least that is what the banshee calls for.

Actually...I don't even think you will be able to get it started below 90.

 

Ok well I seem to be getting around 25psi so I would say I am in need of some engine work. Thanks for everybodies help!

 

What is meant by blowing the top end?

 

this happened to my freind to one of my freinds with a blaster,take your park plug out and look and see if it has little metal ***** than you piston might be chiped take your cylinder off and look.

 

you're screwed !!! Mine did the same thing. My oil pump quit pumping and the piston melted and got chewed up bad.

 

mt400ex- "blowing the top end" is a way of saying its time for a rebuild. s stroke need a new top end about every 300-400 hours depending on use. 4 strokes can get away with alot more hours. When you blow the top end, it means the piston/rings are no longer usable and need to be replaced. You will know when it happens. What happened to 420 happens alot.

 

get it bored, new piston, new gaskets, and your set.