need help identifying a dirt bike motor

fxracerx

New Member
Joined
Jan 18, 2010
Location
Fayetteville
I got a 99 Kx125 and shortly after taking off the top end I found its a 144cc big bore. Now I need to know if it is a stroker or not. How can I figure that out?
 
piston to top dead center.

then bottom dead center.

how much from top to bottom you got ?

and mm spec would be best if you can .

prob just a over bore / sleaved jug tho.

i know i caqn get around a 550 big bore kit for my 500 quadzilla. top end only stuff.
 
Well I know its bore out. Its the furthest you can bore a kx125 before you hit the power valve vanes. From inspection the crank looks like its not stock. Im gonna have to take it to someone who can help me with this because I dont really know what is done to this motor and I dont want to spend money on parts that dont fit. The piston and bore job was done to be more competive in the mx lites divison so the the 125s could be up to par with the 250 four strokes.
 
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