pmptrk
03-28-2006, 06:57 PM
After doing tons of searching, I think I am going to build up my basically stock 400 (except for whats in my sig). After combining a lot of post info, I am planning to go with a 450r carb, crf chain, and HRC cam. However, while running a hrc cam with a rev box, I read a few places that HD valve springs are recommended. Is this right??
If I'm going to do the springs, I figured it would also be the time to go with a 416 or 426 while the head is off.
I live in Nebraska, so i do mostly trail riding, but also make an annual trip to the dunes.
1. Are HD valve springs needed with cam and rev box?
2. What would your recommend: 416 or 426? Why?
3. What brand piston and what compression?
4. Any other changes that would be necessary or recommended while doing all of this?
If I'm going to do the springs, I figured it would also be the time to go with a 416 or 426 while the head is off.
I live in Nebraska, so i do mostly trail riding, but also make an annual trip to the dunes.
1. Are HD valve springs needed with cam and rev box?
2. What would your recommend: 416 or 426? Why?
3. What brand piston and what compression?
4. Any other changes that would be necessary or recommended while doing all of this?