mine is a RB30, carbied, i have yet to pull the motor out to look at it but there is a big hole in the side of the block, guessing that i have distoyed a piston and the conrod has punched through , the motor had at least 300,000km on it the odomitor has not been working for some time and it is just over 300,000km on it so maybe closer to 400,000km