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I'd like to learn myself and would like to know if anyone could come down and help/show me howto rebuild a top end. Obv I'll pay for the help.
I have a 2005 RMZ450.
Thanks
What do you need to do specifically? New piston and valve adjustment? Will the head need to be machined? Valves? Guides?
It's all water under the bridge, and we do enter the next round-robin. Am I wrong?
TBH bud Im really new to the mechanics of dirtbikes. I hear frequently I need to re build the top end of a dirtbike every season. So whatever that entails
Start with checking valve clearences, if you keep them in spec you won't damage the head and valves and have to dump real money. As far as pistons, it's not like a 2 stroke, so you don't have to replace them anywhere near as often. Is the bike hard to start? That's a good indication that they're tight/too tight and you're looking at a hefty price.
It's all water under the bridge, and we do enter the next round-robin. Am I wrong?
on checking valve clearances. If you do your maintenance there is no reason to tear down a dirt bike every season. Especially when you are not racing it. Note the hours on the engine and go from there.
If you don't know how to check clearences let me know and I'll see if i can swing by and walk you through it. It's not hard.
It's all water under the bridge, and we do enter the next round-robin. Am I wrong?
The RMZ isn't bad at all.
I recently checked the valves on my 09 CRF250R and this is what I found.
They're fucked. Feeler Gage doesn't fit the intake or exhaust valves at TDC.
The manual mentioned something about the valves "sticking" which would give irregular clearances even though they are adjusted properly.
Anyone ever heard of this?
I would double check that you are at TDC and go from there. Something isn't right, wrong gauge, not at TDC...
Then you're def doing somethign wrong.
http://www.thumpertalk.com/forum/sho...d.php?t=179775
It's all water under the bridge, and we do enter the next round-robin. Am I wrong?
You're most likely one rotation off. Spin the motor one more revolution of the crank, you'll probably find much better results. If they're beyond repair, the bike won't start for shit. The valves may need to be adjusted (different shims) but Hondas usually don't go out more than a couple thousandths in a season.
-Brian
15 S-Works Venge