hey i was wondering if i could get a piston and sleve for a rex 12. motor 5 port how makes this motor nova,top. Got motor for free but took motor apart and there was little scratches on pistion everthing else looks cherry also discoverd there was no shims in the motor need help where i can get parts motor also has very cery very good compression but only will run for 4 mintues and shuts off..... would like to hear your 2 cents thanks