1996 400xsplorer
Do u guys know if they make a high comp.for my 400? If so who makes it,and how much?
I have my motor out right now to put new rings or a new piston in.And there seams to be some slack in the crankshaft,is it that hard to chang out the bearing?I plan to enstall new a pipe, jet kit,clutch kit,K&Nfilter,reeds,shock and struts,shorter handle bars,stering bushing,waterpump seals,start kit,and battery.While I have my motor out any ideas ya'll can come up with to keep her dependable and improve proformance would help.
Thanks

 

everybody says there is no high comp, piston for the 400, but i have one, it runs best on cam II racing fuel from texaco, but i usally keep it on 93 oct.

 

Any body with some ideas speek up,please!!!!!!

 

I believe you need to have head work done to raise the pressures. A piston alone, won't do it. Call Rick Ritter, he can help you out.

 

I have never heard fo a high compression 2-Stroke piston, that inof itself will raise compression. Their are pistons available that are designed to work better in high compression 2-Stroke motors, IE Wiseco Forged, which is what I believe Kukerdan may in fact have.

Raising a motors compression is the easiest/cheapest route to HP. With the motor off I suggest you have the head shaved slightly (.020) by a reputable shop such as RCR or HPD.

Combine the head work with the mods you intend to get and it should wake the 400 up a bit. Also, spend the extra $ and get a new piston and have the jug honed or bored if neeeded! OE 400 pistons do not work well after a re-ring. It would be a shame to over look that adn ahve to tear ti all apart again in a month.

 

Talk to the HOTSEAT guys, they have lots of bolt on HP products for your 2 stroke

 

Aaen is a good route also, go with a Wiseco piston and get the head shaved for higher compression. The factory piston will not hold up to mods for long.

 

How much can you shave the head and still use 93 octane fuel? My head is currently planed 0.010" and i was wondering if i could go more, still use 93 oc. fuel and see a difference? Also, i finally got my front sway bar done and mounted - made a big difference when running TT's. thanks
hunt

 

I think the limit for 93 is .020".