Re: Water Getting in Top Cylinder Yamaha 40hp Twin

[joesnuffy]

Getting closer I will post pics 2 morrow once they go to the icloud. 2 screw heads were missing on the top cylinder reed valves closest to the rod the 3rd and only screw left was barely holding the reeds and back stop on the screw being bent kept it from unscrewing. My bet is the rod knocked the screw heads off. Here is an auction on ebay right now for a used reed valve assy for that motor notice how the middle screw has been getting hit by the rod. http://www.ebay.com/itm/381402128198?_t … EBIDX%3AIT leads me to think it is a problem with these motors especially when compression is over 170 on each cylinder.

I put a used rod on the upper cylinder when I rebuilt it due to cost of new one which was in specs with a new big rod bearing assy. It is possible when it threw the rod it loosened those screws since the rod cap bolts had loosened causing the engine failure and they unscrewed and the rod hit them I didn’t notice that when I had it apart. I felt the rod with my finger where the two halves of rod come together it still feels tight. I decided to roll the dice and fixed the reed assy best I could and added new screws and lock washers re-installed it and the motor ran a lot better almost getting to WOT. I am going to pull them back out 2 morrow and see if the rod has pecked on the new screws if so the motor will have to come back apart and I haven’t wasted my new head gasket that is coming if not I will look for some good used reeds assy.

Thanks to all for the help,

Joe

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