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Topics - petrolderek

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Japanese Bikes / yamaha ds5 engine
« on: May 14, 2018, 11:30:57 AM »
I am new to this forum. I bought a yds6 which has the earlier ds5 engine fitted. It is a usa import and was piston seized, I have fitted new rings and cleaned the carbs. It starts first kick but is not running as it should its well down on power. The left cylinder is not firing as it should there is very little smoke from the exhaust and the head is only warm to touch after running for a few mins while the right is hot.
The spark is good I have switched the plugs around and removed the carbs which seem ok. I am thinking the crank seals are leaking. The question is can the seals be changed with the engine in, what is the best way of checking them first.

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