Photo 1 of 59 Remove engine from bicycle and place on an uncluttered, clean work area. Easier to keep track of both parts and tools.
Photo 1 of 59 Remove engine from bicycle and place on an uncluttered, clean work area. Easier to keep track of both parts and tools.
Photo 2 of 59 If you haven't already done so, remove the spark plug. You will notice that the pictures are posted in the wrong sequence as the engine
Photo 3 of 59 Remove the (4) cylinder/head nuts, washers, and lock washers. If not already done, I'd replace the OEM studs and acorn (not to be
Photo 4 of 59 Remove head and check for a true flat surface. I mill the head as little as possible (couple of thousands) with 200-320 grit DA self sti
Photo 5 of 59 Remove these two 6mm bolts. These are 2 of 8 that hold the case together.
Photo 6 of 59 After the head is removed pull cylinder jug up to expose the piston.
Photo 7 of 59 Here you can see the set (2) rings on the piston.
Al.Fisherman

Photo 1 of 59 Remove engine from bicycle and place on an uncluttered, clean work area. Easier to keep track of both parts and tools.

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Teardown Chinese HT 49/80cc engine.
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