Yamaha Pro V 150 wet plugs

[Jack O]

Hi Guys
I just purchased a Baron 2100 with a Pro v 150 on it. The Motor was rebuilt do to ian oil injection pump failure. I have had it out a dozen times with noo problems. Tha Last trip I made out the motor was running really rough and sound like its missing. When I got home I checked the plugs. All 3 plugs on the left are wet. The 3 on the right are dry. I tried new plugs and got the same problem. does anyone know why this is happening. I am concerned that all 3 on the one side are doing it.

Thanks
Jack

[jb123]

could be one of your fuel pump diaphrams is compromised letting excess fuel into crankcase.do you see unspent fuel coming out of exhaust ports?

[Jack O]

I dont see unspent fuel coming out the exhaust ports. Is there one diaphram for each side? I thought it may be a head gasket cause its all three cylinders but if a head gasket is broke I think 2 cylinders would loose compression at the very worst not 3. I havent done a compression test. I will do that next to rule out compression. I was also thinking a bad ground on that side of the head may give me a weak spark. I have taken the ground wire off and re tightened it.

[Ken]

Jack,
Sounds like you are losing spark on the port side.
I could be wrong, but I believe there are charge and pulser coils for each side.
You really need a shop manual to help you trouble shoot the ignition and check out the coils of the stator - can order online at www.yamahapubs.com .
Good luck [img]smile.gif[/img] ,
Ken K