400 rebuild questions

[400exracer511]

Im goin to rebuild my 400ex now and ive decided to do it myself, I dont know much about this kind of thing so i have a few questions

1. Im trying to decide between a high compression on the stock bore, a 416 or a high compression 416... what would you all reccomend?

2. will i notice a difference on a high compression with the stock bore?

3. if i go with i 416 does anything need to be done to the head or do i just have the cylinder bored?

4. For high compression is 50/50 pump gas/cam 2 ok?

5. if i go with a 416 is there any thing besides pison, rings, gaskets, and having the sleeve bored that i absolutely need to make it work?

any help or other tips will be greatly appreciated thanks

[400exracer511]

one more question

can an autoshop bore the cylinder if i take them the piston and rings or do i ahve to have a motorcyle shop do it?

[velocityatv]

Whats going on? I live in Council Buffs, Ia If youd like I can hook ya up with a great machine shop I use for my customers motors, here in Omaha.

Joe's Machine
4715 so. 162nd ave.
Omaha,Ne 68135
402-895-0183

Tell him Trent from Velocity Atv told you to call. He's a great guy and has the best prices. Just tear your top end off and UPS it to him. He does some great work. He can get you anything you want, pistons, cams, clutches, and stands behind everything. e-mail me @ velocityatv@aol.com if ya have any questions, take care:devil:

[Pele05]

I've had my 400 with a stock bore high compression piston and you can notice the power. Anytime you up the cc there will be greater power. My best friend has the same quad with a 440 and I can tell the difference in the bigger bore. I am now big boring my bike. If you want to save money, don't get a big bore, just have it punched out to a 416 high compression. Your going to have to hone it anyways for a new piston to seat right, while it's at the machine shop anyways have it bored. You don't have to do any head work. If you do, the cheapest thing is a hotcam, and you don't have to use different springs or rockers with that cam. I used a stage 2.

[400exracer511]

ok thanks guys i think im goin to go with a JE 10.8:1 416 with a stage 2 hotcam

any suggestions on what fuel mixture?