Pull Start for 80cc chinese engine

One way to lock up the engine so you can remove the crank screw or in your case the magnet nut is remove the clutch side cover and put a shop rug into the gears teeth so as you turn the nut to remove it the rag will jam in the gears teeth so you can remove the nut this will work on all the nuts on the engines shafts. you can also take off the sprocket cover and hold the sprockets shaft with and end wrench. the rag trick works the best in my opinion. One of the guys said to pull out the sparkplug and put cotton clothsline in the hole this will also work but try to get the piston to almost the top of its stroke so some of the rope will not fall into one of the ports. I don't know if you could get that unlucky but I'd not want to find out that the rope became shorter after being in the cylinder.
Norman

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Tried just about everything but the shaft keep's turning so I cannot get the nut off.
When I try turning the nut the gear's don't move or the piston.
What about taking the cluch off so it would be direct and hold still?
Still lost with a two weel wonder.

Have you run this bike yet at all.

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visit my blog for Riding in the hood,... The home brew bike journal....http://frictiondrivebicycles.blogspot.com/ The deacon's fiction

Something is broken. Do the rope trick. Put a box wrench on the nut and turn it. Does just the nut turn? How about the shaft?

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It's almost impossible that the shaft is turning and nothing else is.

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If it ain't broke, and you mess with it long enough, it will be.

Which nut exactly are you turning?

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If it ain't broke, and you mess with it long enough, it will be.

I'm guessing the shaft or nut threads are gone.......

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the only way this would be a problem is if you had a freewheel sprocket