High Comp.. Help Please

[red_rider_069]

My bro has a 400ex.. (friend) and we are not sure if this piston requires any kind ofa bore..?!?! or if it fits in the regular sleeve

here is one of them http://cgi.ebay.com/ebaymotors/Honda-400EX-Std-Bore-Wiseco-High-Comp-Piston-4628M08500_W0QQcmdZViewItemQQcategoryZ43977QQihZ00 8QQitemZ180246048050QQrdZ1QQsspagenameZWDVW

and heres the other im not sure about this one.. says makes 402cc's http://cgi.ebay.com/ebaymotors/Honda-400EX-040-Wiseco-High-Compression-Piston-Kit_W0QQcmdZViewItemQQcategoryZ43977QQihZ008QQitem Z180246048039QQrdZ1QQsspagenameZWDVW.. im pretty sure that the 1st listed does not need any kind of bore.. but not sure aboutthis one.. thanks alot peeps :D:macho

[drew416ex]

The first one doesnt have to be bored, but it will be slightly different than the stock size. Your best bet if you are rebuilding is to go up one size. The second one is no longer listed but it would require it to be bored according to the description.

[red_rider_069]

Originally posted by drew416ex
The first one doesnt have to be bored, but it will be slightly different than the stock size. Your best bet if you are rebuilding is to go up one size. The second one is no longer listed but it would require it to be bored according to the description. oh, well i think i'd have to send it off to a shop?!