I recently picked up a 1990 (I think) Yamaha TFM100 ATV pretty cheaply and need some parts for it. Someone messed up the rear axle and the rear brakes may need some work, so I'm considering replacing the whole rear axle assembly. Does anyone have a parts machine from which they'd sell one at a decent price? It's my understanding that any rear axle from a 1990 or newer YFM100, YFM80 or YFM50 will work.
Oh, and I also need the front guard.

Thanks in advance

 

I have the mid gear if its bad, as for the rearend, I just rebuilt a rearend on a 1985 model YFM80, so I know where to get the parts reasonable. pull it apart and see what the ring and pinion look like, the pinion will be 118 dollars the ring (which is part of the axle) is like 350 bucks, hopefully if anything sheared its the pinion, on mine I had to replace all the bearings and seals through the entire rear end 80 bucks for all the bearings. if you need any help just hit me up.
Bob

 

Yup, the pinion is definitely shelled, but the ring seems to be ok. However, there seems to be about 1/4" of side to side "play" in the rear axle, and it appears that someone welded the axle nut that's on the right end of the axle to the axle itself, so I don't know if I'll be able to salvage it or not. I'm guessing that's the reason the pinion shelled out, since it would have allowed the ring gear to become disengaged at times. I was hoping to find a complete rear end since I was planning on replacing all the seals and bearings if I fix this one. I may take you up on your offer once I dig into it. That welded nut has me bothered, though.

Thanks for your fast response.

 

[Hi, I came across thisbokd posting today and I hope u are still on this site. I just got a Yamaha champ 100 for my son as a Christmas present and the ring gear is blown. Do u still no where to find one. Please help.
thanks
josh

QUOTE=bruteforcebob;1955684]I have the mid gear if its bad, as for the rearend, I just rebuilt a rearend on a 1985 model YFM80, so I know where to get the parts reasonable. pull it apart and see what the ring and pinion look like, the pinion will be 118 dollars the ring (which is part of the axle) is like 350 bucks, hopefully if anything sheared its the pinion, on mine I had to replace all the bearings and seals through the entire rear end 80 bucks for all the bearings. if you need any help just hit me up.
Bob[/QUOTE]

 

Take a look in the Yamaha section. someone in Sweden has just fitted the rear end from a "Chinese copy" into their little Yam due to rear end failure. https://atvconnection.com/forums/yam...ar-axle-2.html