125-200cc wr144

How many hours is to long on crank bearings . I have 121 hours on motor.

Whens the last time you did a top end? I will usually check the con rod for play when I do a top end/ or re-ring.

sometimes they last double that...pull the flywheel cover off and see if there is up/down play. they can last a long time if they never see dirt.

If the premix is a good oil and the air filter is maintained properly (so no little dirt particles enter) it last much much longer then that

when replaced already and with good bearings a 300 or higher can be achieved.

I did mine with mirco blue coated bearings.

checking can be done on the flywheel as justintendo said.

Robert-Jan

I change the oil and filter after every race . I was going to do the 165 this summer we have 2 more races.

simply check it but its in my opinion not an hour wear item but a working condition wear item.

you keep it working in a happy environment it simply last longer.

Robert-Jan