Hey all. I have a 2005 CRF450X that i've had since 2007, and have put a good amount of miles and hours on. About 3 years ago my 5th gear went out, so I had it professionally fixed. This last November while pre-running down in baja I lost 4th gear:(. I had to ride it to the nearest town (10 or so miles) where I put her on the chase truck. I haven't touched her other than draining out the Pemex gas.
I always run the full quart of transmission oil, and never slam the shifter (knowingly).
I am finishing up another bike project I had going on, which means I need to pull apart the 450X that has been staring at me every time I pass her in the garage.
Should I upgrade the parts to a certain year's parts? As far as I know, the shop I had do the repair last time said they were the updated parts.
Perhaps have the gears and shift forks shot-peened for extra strengh and oil holding properties? I really don't want to have to rebuild the tranny again...
I am very curious to hear everyone's advice on this matter.
Thanks!