1984 Yamaha Moto4 200 - New Rings/No Compression

[Heater]

C

Edited January 17, 2013 by Heater

[oxidized_black]

looking abit online, causes might have been bad set of rings or not seated yet, honing done but not cross hatched, or wrong size piston or rings ???

[b1jackson]

Rings installed incorrectly, stuck valve or yeh....incorrect honing. Had that happen to me with a scooter motor rebuild. Had to disassemble and rehone. Also if you are using a compression tester, make sure you have some oil on the cylinder wall. A little squirt down the plug hole

[Mudflap64]

If it's a 2 stroke......make sure the piston isn't rotataed 180 degrees. Mist 2 strokes the piston has to be clocked correctly to line up the ports.......some 4 strokes require that too, but not for port alignment.

[marioweldinginc]

Moto4 200 are air cooled 4 strokes. Make sure the starting decompressor isnt stuck open. I have an 86 moto4 200 that had a stuck open decompressor.

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[Mudflap64]

I wasn't sure on the 4-stroke. good advise on the decompressor.

[marioweldinginc]

I wouldnt of known if it didnt happen to me lol

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