ok i was reading at curtis spark's web site about how with their 416 kits and stuff that you should get a heavy duty rod and stuff....
ok well im getting an 87mm (416) piston, web mild cam, ct rev kit, port and polish....would this require that? and how come their kit even minus the carb and clutch which i dont need now are so much more expensive...i think with labor and everything all my modifications should cost around 600.....their cost is like 1700....thanks for any help

 

You are wasting your money no need to port just have a 3 angle valve job done it helps more then porting Call powroll and talk to Pam they are great to deal with and are great help tell her matt told you to call I am doing 3 400ex's right now all strokers Mine is done and it is unreal.Give her a call and they will help you with anything you need here is there number 1-541-923-1290 and talk to Pam They have helped me out many times right now mine is a 440 and I am going to 465 I like to be faster then the rest of them you can never have enought power.Let me know how you make out. Matt

 

y go with the web cam...get an xr400 cam... you might want to think about hardening your rocker arms

 

What exactly is a 3 angle valve job? How much is it? What kind of performance comes with that and port and polish?

 

The rod is suggested for very high performance engines. What you are planning should be fine.

On the porting, just do mild cleanup work and portmatch the intake and exhaust, that should be all it needs unless you go much further with your engine.

A 3 angle valve job is just the correct way, nothing exotic. There are 3 angles cut on the valve and seat that attempt to make the fuel/air mix flow better across this area. There are more exotic methods, but the gains from either are minimal.

 

Hey Gabe, short story for ya. Went to pick up my Quad from my dealer (they sell everything but Honda) and it hurts them them that they sold me my 400ex. Anyway, they told me it ran worse than stock and I should ride it. I laid into it and it rode like the boot was off the carb (sputtering) and I asked what happened and they said they didn't know. I pulled my rear fender off to check if the boot fell off the carb or if the lid was on/off and where the choke was....
THEY duct taped my air intake shut. I will get revenge....This was at 9:00pm tonight so i have no clue how it really runs because it was starting to snow and I had an 80 mile trip back north to Des Moines.

 

YOu should look into http://www.GThunder.com they are new up and comeing shop that does very nice work. They have a sick new exhaust to! Later-
Eddie

 

Gabe...Rick Ritter told me that 400's already have a 3 angle valve job from the factory. I know he is known for Polaris set ups, but he works on all of them. I guess he builds some wicked 250R's. RCR is porting my 440 as we speak. Rick showed me his flow bench and that is a very interesting process.

Jay

 

Yep, like I said, nothing exotic, just the correct way to do it. Don't expect much from the valve job.