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FRAHO
06-14-2006, 11:57 PM
hey i have 400ex whit HFM slip only olso jet kit n k & N fielter i was thinking of doing some thing to my motor like a 426 kit or a 440 kit but i dont know what is the best to install whitout doing any damages to my motors how hard is to install
killa03ex
06-15-2006, 12:05 PM
neither will hurt your motor if done correctly.
FRAHO
06-15-2006, 01:42 PM
HEY THANK IST HARD TO INSTALL A BIG BOARD KIT OR THAKE A PROFESINAL TO INSTALET
killa03ex
06-15-2006, 01:44 PM
have you ever put in a piston? if not take it and get it professionally done, and atleast then you know its done right.
400exstud
06-15-2006, 02:18 PM
While boring the motor will increase power, it will be minimal if it is done alone. You might want to consider a cam to compament the bore, and may having your slip-on converted to a full system. With these mods you will start to get some real power.
killa03ex
06-15-2006, 02:20 PM
also id suggest going with a high compression piston, that will also give you more power through the entire power band
ELewandowski
06-15-2006, 02:37 PM
You will need to get a new sleeve pressed in and bored for the 440 kit. I just had mine done with the 440 and a full system, huge power increase. Its worth it to be able to keep up with the new quads.
400exstud
06-15-2006, 02:39 PM
Originally posted by killa03ex
also id suggest going with a high compression piston, that will also give you more power through the entire power band

That depends on his use of the bike. Anything greater than 11:1 will require the use of race gas. Also, the higher the compression, the more stress is placed on the motor.