Re: Water Getting in Top Cylinder Yamaha 40hp Twin

[joesnuffy]

I think you may have figured it out.

Its raining off and on today so I went out between the rain. I took a pencil and spark plug wrench. I pulled the plugs out and rotated the flywheel to the tdc was lined up on the pointer. I put the pencil into the number 1 spark plug hole and the piston was close to the bottom of cylinder. I put the pencil in the bottom plug hole and the piston was close to tdc for the bottom hole. On the 2 cylinder ignition notes (not 3 cylinder) I posted it showed using the top cylinder and the pointer to 1-3 atdc at idle speed (using timing light)which would still be close to the tdc mark. This could mean the key is sheared and the flywheel is almost 180 degrees out and would explain why it its not running correctly since the coil fires both cylinders at the same time it could run just not run right. I will pull flywheel tomorrow if it isn’t raining.

I also rotated the flywheel until the bottom cylinder was very close to tdc using pencil several times and looked at pointer it was very close to tdc. I guess this could mean that it is tdc for the bottom cylinder but I will have to check to see if the key is sheared at this point. I wouldn’t think the tdc and pointer would be for bottom cylinder?

On the 3 cylinder notes it shows using dial indicator for number 1 piston and running it to tdc then check the pointer/flywheel and adjust it if need be to where pointer points directly at tdc mark. So I wouldn’t think the tdc mark on my 2 cylinder would be for bottom cylinder.

Thanks,
Joe

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