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Yamaha F150 Two Stroke built year 1999

Okay, so instead of spending time with work you are at this forum telling people how bissi you are this time of the year and that they are stupid *******s, right?
All North East and seasonal Marine Mechanics are extremely busy this time of the year.

I never called anyone (Your Words not mine) "stupid *******s".

Just pointing out that you have to be more accurate with the information that you supply us..........The "I GIVE UP" remark was directed at all who ask abstract questions on a Marine engine or system.

You finally got to it in your post #22

That should have been your first post.

Now onto why this happened......

First check the fuel pump, if the diaphragm has a hole in it it will pump raw fuel into the crank case and this will destroy one cylinder.(Haven't looked at a V4 Yamaha in a while, Not sure which Port Cylinder powers the pump)

Second, Lack of fuel to that cylinder will destroy it..Lean Condition.

Carbon build up on top of the piston will Pre-ignite that cylinder and destroy the piston.
 
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