Strange Tinny noise before startup ??

I've had a couple engines where the clutch cover actually comes on contact with the clutch. When I removed the cover I could see a circle wear pattern on the inside of the cover. Added another gasket and problem solved!!

Try just slightly rounding the back edge of the flat with a dremel. The edge that pushes the clutch pin. Makes the clutch alot smoother and easier to pull.

Hi Robin,

Boy, I've been @ that place before, with chainsaws, car motors, transmissions and whatever. At which point do I replace this or that.

I have two of these two stroke engines but all two strokes are similiar. Still learning what I don't know about these chinese engines.

I think if I were to rebuild the top end on one of these things there are some considerations I would take into account. Rod and pistons slop at both ends and the condition of the cylinder itself. Any time you replace the rings you cross-hatch the cylinder. You want the new rings to "seat" or wear in. If I replaced the piston I would replace the wrist pin, stays and rings.

It starts to get complicated in a hurry for a straight forward job that seems simple. It all depends on the "wear factor".

Two thousand miles seems pretty good for one of these engines verses how much money you would spend in gas to make a car go that far. I've seen where you can buy just the motor for less than a hundred bucks. Not a bad deal considering the hassle of the rebuild and time into it. Then if something goes wrong your out your money and time. (experience speaking here)

I've only got a hundred and fifty miles on my 49cc engine and fifty or so on the 68.5 cc but am having problems already and its brand new. It seems there is always something to do on these engines.

RPM

RPM

robin said:

After the above incident i ordered a new piston and jug--it ran 5 minutes and the retainer clip came off jamming itself on the piston wall and it too seized solid---now ill buy the whole new engine !!!!

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I did the same thing, the little end bush disintegrated went into the crankcase then back up the transfer ports scoring the bore and piston. I got a new piston and barrel and thought i got all the bits out of the crankcase but sure enough same thing happened again, new motor!