Piston & Cam

[gotwarrior]

I am building up my warrior and I am going to be rebuilding the motor. I XC all the time, so that is alot of low end. I wanting to know if I should do a cam when I do the Piston. Or... Just do the piston. Let me know what you think I should do.

if you have the money go for it


if your like me pistons are expensive enough

[gotwarrior]

All you have is a piston, no cam?

Originally posted by gotwarrior
All you have is a piston, no cam?

yea 12:1 compression wiseco piston

[cals400ex]

i would do both if it was me. you should be able to pick up a hotcam for a good price and it will help.

[gotwarrior]

What type of Hot Cam? About how much are they?

[Colby@C&DRacing]

they offer a stg1 and a stg2 but the 2 is for the stroker crank and piston

[gotwarrior]

Ok, so i need a stg 1 cam. Now what about the piston. Dose anyone recommand anything? I don't want to have to run race gas.

Another question, is my stock starter going to work with this compression?

[bubba's400ex]

they told me that i could run 11:1 on 93 pump but i was a little woried so i went with a 10.5:1, i'm in the middle of rebuilding right now.

[gotwarrior]

I think I am going to go with the 10.5:1, and a stage1 hot cam.

But, Can use just my slip on pipe, or do I have to buy a full exhaust?

And will my stock starter work?

[MO-EX-RIDER]

get the 11-1 youll be fine with 93 octane if it pings under load we'll just dump a lil 110 in it, and a stock starter will be fine

add a rev box to the list also:D :cool:

[bubba's400ex]

ya you want a full system.

[gotwarrior]

Not everyone has all the money like MO-EX-RIDER.

id go with 11:1 comp piston wiseco


i have 12:1 and im running 93-94 octane

your exhaust will be fine

[gotwarrior]

Did just doing the piston give you a noticeable amout of power.

[gotwarrior]

I was thinking about this kit. But that is alot of money if I don't need some of that stuff.

[gotwarrior]

After looking around I couldn't find a 11:1 pistion for a warrior. All I found was 10.25:1 by wiseco. If you no where a 11:1 is let me know.

[400eXr1d3rZ]

I found a 12:1 :

http://cgi.ebay.com/ebaymotors/YAMAHA-YFM-350-WARRIOR-JE-PISTON-STD-BORE-12-1-87-04_W0QQitemZ300029737625QQihZ020QQcategoryZ43977QQ ssPageNameZWDVWQQrdZ1QQcmdZViewItem

Item Number 300029737625

Stock compression is 9.2:1 on a warrior so that 10.25:1 would be a good difference


i could not find a 11:1 so i guess they dont make that compression for the warrior

[Colby@C&DRacing]

JE offers a 10.5:1 85mm and a 12:1 83mm
Wiseco 10.25:1

[gotwarrior]

Now can I use my stock valve springs?

[Colby@C&DRacing]

all you need is a piston,cam and gaskets

[gotwarrior]

Good! Now I am looking for heavier head studs for my warrior. Where might I find them?

[400eXr1d3rZ]

Originally posted by gotwarrior
Good! Now I am looking for heavier head studs for my warrior. Where might I find them?

GT Thunder and Colby sells them I believe.

[Colby@C&DRacing]

you won't need the heavy duty head studs on a warrior

[gotwarrior]

Well, If I don't need them than I will not get them. It will save me more money.