Bolts-On!!

[cannibalq8]

Looking for best performance

1- Exhaust system
2- Airfilter and jets
3- drop-in cam
4- High comp piston ( 12.5:1 )

I'm doing trails and dragging with friends

thanks

[idontknowwhoiam]

i dont get it......is that what your asking about?

[GoldenGloves]

I'm not positive, but I think hes asking which brands are the leading performers..

I've learned that most brands are a preference, in most cases the dyno numbers are usually pretty close to each other, some perform in different ways, i.e. hp and torque..

[underpowered]

1- Exhaust system

Full or slip on? looking for low end power, top end? got to tell us more. most people like the HMF (including me!). or the sparks X-6, Yosh and some others. it is up to you, but i know alot of people will suggest the HMF

2- Airfilter and jets

I like K&N but many dont, some just prefer a quality foam filter like UNI, or twinair. jets, just talk to whoever you get the pipe from and they can help you with jetting for your elevation and mods.

3- drop-in cam

Hotcams stage 1 would be good, but really depends on what bore you are going with and how you ride. if you are going big bore and ride fast alot a stage 2 would probably be better.

4- High comp piston ( 12.5:1 )

First off, you do know that you will have to run race fuel with that high of a comp ratio. wiseco is probably the easiest brand to find, but JE and ross seem to be a little better and more accurate in their compression ratios. what bore are you looking at? stock, or going larger?

[cannibalq8]

Our pump gas here is 96 and 98 unleaded octane so we shouldn't have any issues with 12.5:1 comp. I know some guyz use 13:1 with our unleaded pump gas.

What about Nmotion pipe?..I'm thinking of CP high piston...what do u think?

thanks for replies :)

[02440exkid]

NA 98 is not really enough plus race gas has lead in it so it will make it run cooler and better lubricates the top end.

[GPracer2500]

98 RON? -------> the method used in much of the world
98 MON?
98 (R+M)/2? ------> the method used in the US

If your getting 98 octane at a pump and it's not advertised as a racing fuel than it's probably 98 RON. RON is an octane rating method that yields higher numbers than any other method.

(approximately)
98 RON = ~88 MON = ~93 (R+M)/2

98 RON won't cut it in a 12.5:1 400EX under all but very unusual circumstances.