Crank seal sizes

[johnben]

Does anyone know the dimensions of the crank seals?
My CRM has got hard to start from cold and it won't tickover, it just revs out a lot, I've been told it could be leaking crank seals.

[freebz1122]

i dont know what u mean by revs out alot but if its hard to start and wont tickover it sounds to me like the carb isnt set up right.
i carnt see it been leaking crank seals. but check to see what condition there in as there only about £10 from leisure trail.

first thing to do if you havnt allready done so is check the spark plug condition and maybe try a NGK B9EGV for better cold starting
if the plugs ok and not fouled and you have turned the idle screw all the way in and it still wont tick over then i would suggest trying to sync the carb and then if not clean it.

but first look for an air leak, check the inlet manifolds arnt split and that the clamps are tight and make sure the carb top and bottom are screwed on properly.

air mixture screw standard setting is mk1 2.25 turns out and mk2/3 1.25 turns out.

To check to see if the carb is set up right warm up the motor and let it idle as low as possible while still running smooth. From idle, whack the throttle wide open then let it close completely. Listen to the motor. If it bogs right when you whack the throttle open, then revs up, turn the air screw in 1/2 turn then try again. Do this until it revs up crisply. After the motor revs up, listen to it reving back down. If the revs drop quickly, and the motor starts to bog, and/or die, then you're too rich on the air screw, back it out 1/4 turn at a time. If after you let the throttle off the motor tends to run on and on while revving down very slowly, you're too lean and need to turn the air screw in 1/4 turn at a time. You want the revs to come up from idle quickly and smoothly, then drop back down to idle the same way. If you turn the air screw all the way in and it still needs to go further, then you will need a larger pilot jet. The opposite is also true: if you are backing the screw out so far that it darn near falls out, you will need a smaller pilot jet.

if you find you are turning the mixture screw to far out or in before buying smaller or bigger jets i would suggest taking the carb off and making sure the pilot jet isnt blocked.

[johnben]

Thanks for the info,I sold the bike a while ago.