Coolster 125cc valve issue
#1
Coolster 125cc valve issue
I've got this little machine that is a bear to start, then has no power. It smokes badly and if I remove the crankcase vent tube, there's a steady stream of compression pulses and blue smoke there too. I called the dealership I bought it from and the mechanic told me that the exhaust valve was probably "tight" and out of adjustment. I youtubed it and adjusted the valves to specs. It helped a little, but still hard to get running and smokes.
Think maybe a vale seat problem?
Thanks
Think maybe a vale seat problem?
Thanks
#4
Figgered it out
I finally built an ATV lift and got the machine off the ground, so I could work on it.
I pulled the head off and there it was, a freaking blown head gasket.
It had separated at the cam chain passage, so the compression blew down into the crankcase. Hence the steady pulse of fumes out of the exhaust vent. Bought a new one for about five bucks, buttoned it up and it runs great. Whew...
I pulled the head off and there it was, a freaking blown head gasket.
It had separated at the cam chain passage, so the compression blew down into the crankcase. Hence the steady pulse of fumes out of the exhaust vent. Bought a new one for about five bucks, buttoned it up and it runs great. Whew...
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#8
Okay, so that elminates the smoke issue from a valve adjustment. Mine idles blue smoke all the time I tore into the top end and low and behold the piston rings were really out of spec and the piston it's self was all marked up. I'm buying a new piston and rings the head was fine. Perhaps this is your issue too. If not could be valve seals.
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