what do i need

[MacMan27]

what can i do to my z400 to make it run with the 450s.
i already have the 440 kit but what else can i do ?:macho

[400exrider707]

well what does your "440" consist of? We need details to tell you what you can improve on.

[MacMan27]

i have it just bored with a low compression piston

[MacMan27]

bump

[z400riderz400]

easy, Athena 434 kit, run the drz base gasket, install drz valve springs, both hotcams, and a rev box. and a exhuast, lol

[hang1p]

hot cams,ct exaust,40mm fcr carb with cable from service honda.com 15 tooth sprocket and you will have a machine that will keep up and spank some of the stock 450s with mine i could beat a 450r with a hrc kit and that ain't no joke but if a yzf had a pipe and some jetting i could not take it and if the 450r had a pipe i could beat it( like a duncan 4 fatboy pipe)

[PeeWee21]

1st thing would be to pull that low comp piston out and get the ratio to atleast 12:1. Get a set of cams, if you go with the new style Hot Cams they'll have the auto decomp feature the old ones did'nt have. Next thing, get a higher rpm rev box so you can take advantage of the cams, i suggest Dyna's because of their adjustability. Install an FCR 39, they're the best for the Z motor, the 40mm works good but only if your really going nuts with your motor. A full exhaust system is definitely needed, most of the manufactures are within a 1/2 hp with each other. Alot of people will argue with me on this but i know from experience....if your gonna have it ported..have it done by a PROFESSIONAL...like TC Racin' engines, Yoshimura or Dab racing, more than 99% of the time, you'll lose hp by having some Joe Blow do it. I've talked to TC and the East Coast dealer for Yoshi and they said you'll only gain 1-3 hp at the most with a proper port job, you'll more likely to hurt it performance rather than help it! For anyone who disagrees....call TC Racing and they'll fill you in!