Big Bore

[JStylz0383]

Dose anyone know how big a stock 250ex engine could be bored over? And what all do I need to buy to have someone do this?

[COOTERGUY]

TO MY KNOWLEDGE ALMOST ALL STOCK HONDA CYLINDERS CAN GO .80 TO .100 OVER, BUT YOU GET INTO HEAT ISSUE IF YOU GO TOO FAR WITHOUT RUNNING AN OIL COOLER. ALL YOU HAVE TO GET BEFORE YOU MACHINE WORK IS THE PISTON THAT YOU PLAN TO RUN, SO IT CAN BE CLEARENCED FOR THE BORE.

[JStylz0383]

What should I look for when getting a piston and about how much are they?

[COOTERGUY]

AS FAR AS WHAT PISTONS TO RUN GO WITH EITHER A WISECO OR A JE. NEARLY ALL OF THE SAME QUALITY, USUALLY COME IN EITHER STOCK OR FROM 11:1/11.5:1 BOTH OF WHICH YOU CAN RUN ON PUMP GAS 92. YOU CAN FIND PISTONS ON EBAY ALL THE TIME FOR AROUND $75.00 THAT WOULD GET YOU ON THE WAY.