I have a Yamoto 150 (my daughters) and the transmission case cracked, it looks to be caused by engine mountsallowing the motor to twist under very low power.
My question is, is there any Yamoto service/dealers in Orange County that could work on this bike?

first you do know that labor costs are not covered under warranty issues, that being said if it's the cvt transmission case cracked and you need to find a dealer to replace it, it would have to be a independent service center that works on all models of atv's and replacement labor costs to replace the case should run between $300-500,plus the new case, not worth the money since you could buy a new engine for $400 or a new 200 hi bird atv for $800 includes shipping. now if it's the reverse gear box cracked, then you can remove this yourself and send it back to the dealer where you purchased the atv and let him replaced it under warranty cost would be just shipping charges or if the dealer refuses (most do) honor your warranty you could purchase a new reverse gear box for around $150, now if you have no warranty and want a quick and permanent fix then buy some JB WELD from any auto parts store or wal mart, this will fix the crack and stop the gear oil leak cost around $5, also make sure all engine mount bolts are tight and not missing any, your engine should not be torqueing to cause this problem,

Thanks Bill
At this point the bike is scrap. If you know anyone that needs a 05 Yamoto 150 for parts, let me know. I should have never bought a Yamoto, I knew better.

Can you post a picture of the break and effected area, there may be an easier fix as Bill stated! It's easy to upload a picture at www.putfile.com!

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mean their's quick and easier fix than JB WELD, i should would like to see it