If you are also experiencing unexplained losses of power at any speed in any gear, or if the engine is pinking, the problem is likely to be the valve-stem seals. It is also highly likely that you are loosing compression in one or more cylinders. This could be down to heavy scoring on the bore, or a damaged or worn piston and / or rings. Also check valve clearances / injectors for obstruction / wear, exhaust pipes for loss of back-pressure, spark plugs & HT leads for correct gap or damage / wear, valve timing, and the carburettor, air filter & fuel hoses for blockages & dirt.
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sounds like the choke is not working correctly
fuel pump keeps running after the key is out what do I need to check I have to remove the fuses to stop the pump.
check for bare wires or short in the wiring to the rear lights
When installing the cr 125 head gaskets, make sure to check the surfaces for any old gasket materials or scratches. Check the head to make sure that it isn't warped. Make sure that the cylinder pressure isn't too high. Tighten the head bolts in the proper sequence and at the proper torque, and the gasket should stop blowing.
Inertia