Okay all. I've been out of racing for a couple of years now, but I'm planning on getting back in.[img]i/expressions/face-icon-small-happy.gif[/img] Also, before the season starts again, I want to build up my motor again. I have a few choices, but hopefully you all can help me out, and give some suggestions.

<u>416</u>
*87mm JE piston (? compression)
*Cylinder bore & hone
*Port & Flow head (w/3-angle valve job)
*Camshaft (drop-in or other?)
*FCR carb (? mm)

I've also thought about the following:
*Oversized valves
*Hard-faced rockers
*HD timing chain
*HD connecting rod
*Weld and true crank
*HD valve springs

I just feel confused on everything right now. Any info, help, or opinions you can offer about my potential setup would be greatly appreciated. Thank you.

 

ttt

 

You got a nice list there. I would go with 11:1 comp. JE or Ross piston, and FCR 39. Porting will help a lot, the HRC cam is a drop in cam, made by Honda, gives awesome top end. I don't think you need a the HD stuff, but it woulndn't hurt. Also the Sparks X-6 is a great pipe.

 

Right now, my motor has the following:

*Stock bore, 11:1 Wiseco piston
*XR400 cam
*Sparks X-6 full system
*rejetted factory carb

I noticed a really nice gain in power over stock (obviously), but I'm needing more power.

Should I just go with an overbore (416cc) TRUE 11:1 piston, HRC camshaft, Port/Polish head (3-angle valve job?), and 39mm FCR carb? Or is there something I should change? What kind of rear wheel numbers are we looking at? Thanks.

 

I know, I know. I've got a Wiseco ![img]i/expressions/face-icon-small-happy.gif[/img] It's not terrible, but there is certainly better available! I was actually looking at a 12:1 or 13:1 JE or Ross piston, and a hotter cam. A better carb is in the cards too.

I still have a few questions. Should I overbore any? Also, where can I get these parts cheap? (You must remember I've been out of racing for a couple of years now.) Any help you guys can give is greatly appreciated.

 

madracing,

I was planning on running something like 20 races during a season. What kind of modifications did you do to the 416cc bikes you built yesterday? Thanks.

 

one was a ported 416 with sparks pipe, fcr39mm timing advance cdi box aluminum air box k&n stage two hot cam

 

madracing, I got your PM, and sent you one back. Do you have any dyno numbers before and after? I'm just curious how much I'll gain over my current setup. I'm so stoked about racing again.[img]i/expressions/face-icon-small-happy.gif[/img]

 

ttt

 

I would deffinatly get the oversized valves too. Last year I added a 39mm fcr fully ported head with the o/s valves and It was a good jump over how it was before.

Depending on how much money you want to spend powroll can stroke your crank put on a heavy duty rod. It would jump a 416 to 440cc's. It should give you some more grunt and you wont have to worry about braking a rod if your running higher compresion like 12 or 13:1