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Old 12-21-2014, 10:22 AM   #1
scraperbike
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crf450 motor rebuild

for the dirtbike guys im thinking about going through the motor on my 2007 crf450x this winter. nothing wrong with it but it has alot of hours on it and feel it needs to be freshened up before anything does go wrong. guy rebuilding recommends a stock rebuild for reliability. basically what would you guys recommend. stock parts? cylinder? piston? valves? crank bearing?
Is the 450r cam a worthy/reliable upgrade?
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Old 12-21-2014, 04:49 PM   #2
Jason_Canuck
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I only did top end on mine but went with SS valves.
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Old 12-22-2014, 07:35 AM   #3
Truckin_Thumper
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If it aint broke, dont fix it.

BUT, if yer gonnna go inside, do it right.

Weisco, Hot Cams, etc.. Just as dependable as OEM. The wrench monkey is usually what causes undependability.
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Old 12-22-2014, 10:43 AM   #4
Scorpio
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Have a competent builder check the motor and go from there.
My '06 had a few years of abuse on it and I recently re-did a few things just to be safe.
Went with a new OEM piston/wrist pin, re-honed cylinder, new oem head w/ Kibblewhite SS valves/springs, and state-2 hotcam.
Since putting the SS valves, they have stayed in spec after only one small adjustment.
You're going to be looking at a couple G's parts and labor for the above, but you'll have a good, strong, reliable motor.
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Old 12-22-2014, 10:59 AM   #5
UniFiddy
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Basically everything above, mine has now too...and knock on wood, valves have stayed in spec!

But I'm more of a if it aint broke don't fix it guy. And mine was broke.
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