Hello!

I have a GP50 diesel with a burned out motor, it may have been from lube in the gears, so I cleaned it out and was able to turn the shaft in the motor.  When I tested the motor (at half throttle or about 8 volts), it worked, but immediately began sparking and smoking.  I understand per the instructions that came with the engine, that the motor should have a lifetime warranty, I hope this applies?  Any help would be appreciated.

If I were to send it back, would I need to send the entire engine, or could I just send the motor?  Also - I see a new motor is only $10.00, but the part # on this site is 9902 vs. the part # in my instructions of 9915.  I do believe it's the same motor from the photo, but curious why the # variance?
 
Thanks in advance, Jim