need moe power for 99 yz 400f

[yamaha racing 230]

what r u guys doing for power my 400f needs more whats the best mods for the money my bike is stock now and has anyone put a wr transmission in a yz. thanks

[642MX]

The best performance mod for the money is a Wiseco 13.5:1 piston, followed closely by a set of Hot Cams. ?

[felix 222]

full system exhaust helps as well

[Birdy426]

The best performance mod for the money is a Wiseco 13.5:1 piston, followed closely by a set of Hot Cams. ?

Yup...hi comp piston followed by Hot Cams, then a big bore kit, and finally, the pipe in order of bang for buck.

[yamaha racing 230]

will i have to run race gas with 13 5 1 and i heard the wiesco is a piece of shit piston

[642MX]

will i have to run race gas with 13 5 1 and i heard the wiesco is a piece of shit piston

I use race fuel, but some people don't. Wiseco makes very high quality parts. They have been in business longer than you've been alive, if they sold junk they would've been out of business along time ago. ?

[GONE1445]

dont get a high comp piston unless you plan to race a lot

the power it adds vs buying race gas is something you should think long and hard about before you get one

if you can get race gas easily then go for it

[DPW]

top end?

[Laurentian]

Over 4 seasons on this set-up :

Wiseco 420 kit

Full white Bros E-Series, using all 12 plates

Uni-Filter

Jetting

Outcome is solid crisp, hangs with any 426 and revs to the moon

Kep top end fresh with new rings every season and you will have

more than enough power.

Then again if you ride deep sand that is another issue.

[SpceSpff]

The best performance mod for the money is a Wiseco 13.5:1 piston, followed closely by a set of Hot Cams. ?

I followed that HOT CAMS link, and saw nothing for Yamahas?

[grayracer513]

The link takes you to page one of the listings. Go to the next page. (there's a link)

[captaincaveman]

look on ebay! I got both for my 99 yz400f for $250 shipped!