piston or cam...lowend power

[SKOAL400_311]

ok my 400ex listed with the mods below still needs some low end power for me
i was thinking about a new piston or cam
any suggestions on how i can get some low end power for the trails

[jb400exxx]

you could get just a high compression piston like 10.8:1 or a little higher and get a decent gain. or you could get the higher compression piston and a hot cams stage I if you want a **** of a lot of lowend. or you could get a high compression and hotcams stage II if you want good low, and also more mid and high along with it.

[Steven]

A higher compression piston around 11:1 is your best bet for bottom end. More displacement will also boost bottom end, like perhaps a 416cc motor.

All of the cams on the market sacrafice bottom end for top end and midrange. OEM cam is the best for bottom end.

Try a 14 tooth front sprocket, you will love it for bottom end.

[wilkin250r]

My girlfriend just added a FMF Q-series (quiet) and it really improved the bottom end, but she lost a bit of top end.

[jb400exxx]

he already has a pipe, he's lookin for more.

[northeast400]

are you looking to do them together or one or the other?

[redrider ex]

yes try a 14 tooth

[SKOAL400_311]

im looking for one or the other
if you guys could just tell me the best one for the buy here i will probaly go with that one
and could ya give a price too


well abotu the 14t front sprocket i have 18in tires and that made it alot better but a guy at my dealer said that a 14t front sprocket with 18 puts too much strain on the engine.....now let me tell you this guy dont know jack abotu fourwheelers but he said alot of people told him
i dont beleve it but is this true?
and since were on the topic i read somewhere that if you get a 406 you dont have to resleeve, is this true

[jb400exxx]

you can go up to 426 w/o resleeving. i wouldn't get a 14 with 18's. that will be really slow. i really don't think it would hurt the engine any.

if you can only get a piston or cam than get a J.E. or Ross 10.8:1 or 11:1 416 or 426 piston. but i would do a cam at the same time, while it's all apart. cam and high comp piston go really good together.

[Ralph]

u dont have to resleeve for 1 406, 416, or 426.
the best deal is a 416 great power and great reliability. get a 416 piston and kit(11:1), and hotcams stage 2

[Dune Surfer]

You need to do both. Doing one without the other defeats the purpose. Trust me.

[redrider ex]

i run a 14 and it does'nt hurt any thing

[SKOAL400_311]

Well after ya'll helped out i have decided just to go with a 416 kit
But i dont plan on doing it till next winter since winter is almost over and i plan on riding it now

so i guess i will just ride the sh*t out of it for now and just have her rebuilt with a 416 next winter

thanks again

[bmw500hp]

Originally posted by wilkin250r
My girlfriend just added a FMF Q-series (quiet) and it really improved the bottom end, but she lost a bit of top end.

Well it looks like your next decision is which surgeon and what cup size!