Well I'm pretty certain the rod & rodbearing finally exceeded their wear limit last weekend on my 99 WR 400.
The bike has a lot of hours/ miles on it. I want to freshen it up, make some good upgrades and get it ready for another decade or so of abuse.
As it sits the bike's current mods engine wise are : grey wire, yz timed, dr.d pipe, and airbox mods, and that's basically it.
The power on this bike has always been ok and it has been a solid runner. starts first kick unchoked stone cold and will go right to idle.
So basically I'm wondering what upgrades are recommended to be done while I have this thing torn down.
Here's what I had in mind.
have a new 426 rod pressed on the crank.
bore cylinder to 95mm.
13.5:1 weisco 426cc piston.
freshen up the head, most likely do some porting or at least port clean up (myself).
was thinking of upgrading the carb to something off a newer 426 or 450 (thoughts on this?)
should I change any bearings out?
should the clutch be upgraded for the increased power?
any other tips/ tricks/ suggestions?