hi ppl erm bit of a problem with my savage 3.5 recently bought my dads old savage 3.5 back off a friend of minething was he said my old man bust the old engine so he went and put a picco p3 .21B rotostart in it problem is every 1 or 2 runs the whole thing comes looseand doesnt turn my engine over properly until i take the whole engine out and retighten it any help or advise on this problem would be much appreciated

2 words - ONEWAY BEARING and its not coming loose and your not tighting, the metal expands when its hot, by the time you put the motor and crak down on scews the motor is cool alowing you to turn the motor over. its like a 15$ part and $.20 of labor

thanks man ive got a spare one of those