Planet Minis

03SVrider

Whaat other engines have compatible internal parts with the 107 SDG motor. I'm in bad need of the tranmisson main shaft and I can't find anywhere online or dealership that sells any sdg internal parts. Any input?

Kurlon

You first need to find out if you have an 'old' or 'new' style gearbox and cases. The old style transmissions had stepdowns on one of the shafts where it went through the cases, and was a common break point. The repair was a revised case half, and a set of shafts without the stepdown.

The new style motors should be transmission compatible with Lifan 120s.

03SVrider

Thanks for the info. I see now that my engine is an old style gear box because the shaft does shrink down where it goes through the case and that's exactly where it broke on both the 107 engines that I have. But where online could I buy just the case half and the shaft. THis is exactly why I stayed away from chinese motors all these years cause you can't just go to a dealership or check a microfiche and buy what you need. Especially not where i'm from.

Kurlon

You CAN buy a 'fix kit' from SDG directly, but for what you'd pay for a case half and and some transmission bits, you'd be almost all the way into a 125 or bigger import mill to replace it outright with.

doopsx3

Malcolm Smith Motorsports was selling the repair kits for these engines...I bought 2...they come with all the needed parts to strengthen up that bottom end..

Malcolm Smith Motorsports California Yamaha Suzuki Motorcycle ATV Dealer - Malcolm Smith Motorsports, Riverside, CA - BMW Husqvarna KTM Bombardier Dinli Sea-Doo Zieman Scooter Watercraft Utility-vehicle Trailer

they had sold them on the flebay but just give them a call and they might can help

03SVrider

Thanks for all the help guys. I'm at my wits end with trying to find parts for this motor, and considering it's what i used to do for a living this is pretty lame. I just ordered a mainshaft and countershaft for a CRF50F to see if they'll hopefully work for this application. But any other input is more than welcome.

deep relations

every bottom end part from any 15mm output shaft 120,125,138,140,pitster,rcm,lifan,jialing,krp,etc. except the left crankcase is interchangeable.if your right crankcase isnt broke you can drop in a 15mm output shaft bearing from any of the motors mentioned along with the tranny and kickstart gear train and your good to go.