How to tips for boring & resleeving your 400ex

[hawiianpwr]

Yeah thats some nice info that should go into the maintenance forumn

[Dunlap]

Glad to help, I hate to see so many people having problems with high performance parts on there 4-stroke because they got a 4-stroke for reliability in the first place. There should not be any reason you cant have killer power and reliability just like my 500cc kits.



To get any real power you must go inside.

[EXevan91]

i have a Q about the 500cc kit of yours, do u have a chocies of a piston with low enough comperrsion ratio that u can still run it on pump gas or no?

[taino_racing]

interested in above question

[BlackTrx440ex]

thats another thing i have a wiseco big bore 440 in mine and i want more power or more speed or something i race mx with it wat should i do? i have a hott cam stage 1 in it too plz pm me with wat i can do thank you jared

[400exrules]

im want to bore my 400ex to a 416, and their is a local shop that can do it for me. now, do i need to take them just the cylinder? so, do i have to install the piston myself? how would i go about getting heavy duty studs put in if i have to put it back together myself???