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Originally Posted by Duncan_Idaho
I'm looking at a 2001 Yamaha 150 OX 66. Presently there is a 1987 200 Merc Black Max on the boat. The mechanic is telling me the Merc is tired and firing on just 5 of the 6 cyl. Anybody out there got one of these Yamahas and are you happy with it.
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Those Yamaha motors are great, but don't give your merc away (unless you want to send it to me!!).
Did the mechanic tell you which cylinder isn't firing?
Shouldn't take more than 30 minutes troubleshoot that problem and fix it (assuming you have the parts).
Start at the plug (that isn't firing) and trace the connection back.
Things it could be.
1. bad plug
2. plug wire
3. Coil
4. Bad switch box (1,3,5 or 2,4,6)
5. Corroded wire or lose connection b/w the switchboxes and the coil.
Assuming your compression is normal around 125 psi in all 6, I'd say fix the Merc (don't forget the yank the oil injection if you do).