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I have just destroyed my second set of gears this month, both times where downshifting from 4th to 3rd and the dogs broke off both times, I'm not racing or riding hard/aggressive shifting ever other than occasional full throttle in 4th as this engineis in a road bike, I always clutch when shifting up and down so not sure how this has happened twice.

I am wondering though if anyone knows if the z155 gearset is any higher quality? They are £45 for z155 and £30 for yx140/160 over here and I'm wondering if there is any difference or just a money grab?
 

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Have you ever tightened down the shift fork retention bolt? You need to loctite the bolt and get the bike to shift smoothly before it hardens the let it sit for 24 hours to cure. It is the bolt under the stator cover above the front sprocket under a rubber cap. I had to replace my gearbox after the bolt got too loose and tore a tooth off my 3rd gear in my yx160
 
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