Did you get this sorted out?
The YTM 200E, ERN and 225DX, DR all use the same pull start. Also the same as the YFM 200 and 225. There was a newer model quad too,,, bigbear or something that used it too.
The YTM200 (chain drive) has a thicker cover for the decompression gears. You can use the above pull starters on it without the decompression assembly.
There was a guy on the YTM Facebook group doing a buy for China made pull starts off a Chinese quad a while back. I don’t know what model that was.
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1984 Yamaha YT 60 Tri Zinger(current project)
1983 Yamaha YTM 200 (rear suspension kit)..... long term project
2004 BMW R1150R
1972 Honda CT 70
2007 Lifan 110