I have a 200 hp Johnson outboard V-6 2 stroke. I put new spark plugs in it. I put new mid grade gas with the proper gas/oil mixture. The problem is that it won't start unless I take out any one of the spark plugs. Then I have to put it back in while it is running (quite the shocking experience). It seems like it has to much compression. The engine spins over fine but just will not start unless I take out a plug. The gas is good, the fire is good, the battery has plenty of juice. The boat set for about 4 months since I run it last. I have asked many people and the best thing I have heard is that there is carbon deposits on the pistons causing to much compression and that it can be corrected with a fuel additive. Does this sound right and are fuel additives safe for a 2 cycle engine? Any ideas?
2007-07-01 04:11:57 · 7 answers · asked by russbillen 4 in Cars & Transportation ➔ Boats & Boating
Simple enough to do a compression test yourself, Either buy one or borrow one from like Advanced auto parts, or equivalent. Put the spark plug adapter in the head crank and see what you get for each cylinder. They all should be close to one another.
Question: Do you remove the same spark plug each time you start? Could you have placed plug wires on wrong plug?
2007-07-01 04:26:59 · answer #1 · answered by tc_an_american 7 · 0⤊ 0⤋
go to a yamaha shop they have an additive that removes carbon I think it is ring free or something like that. did you fog the motor before storing it? if not try spraying some pb blaster in the spark plug holes and let it sit awhile just turn the motor over by hand a few times if there is some crud in there it should loosen it up put the plugs back and fire it up. additive are safe as long as it doesn;t thin out your premix ratio if you run 50:1 you'll be fine with a pint of additive. did you drain the tank or just put fresh gas in it you may have some water in it try some HEET in it to absorb the water
2007-07-01 04:21:33 · answer #2 · answered by answerman 1 · 1⤊ 0⤋
Quite simply it should be checked by a good mechanic. A piston or valve could be a problem, but do you really want to be pulling plugs once your out on the water. Worse yet is the small but present danger of fire. Get it looked at.
2007-07-01 04:18:31 · answer #3 · answered by rob_hallock 4 · 0⤊ 0⤋
it is an overfueling problem. it is giving to much gas to one or both of the cylinders. taking a plug out gives it air and then it runs. that says the fuel and air mixture is getting upset. take it to someone that understands how they work and is qualified to work on it. Or you could get it running and try running it out of fuel after it is running . this may clean out whatever is causing the problem.
2007-07-01 04:20:31 · answer #4 · answered by oscar m 2 · 0⤊ 0⤋
sounds like its in the carburetor its getting to much gas and when you pull a plug it lets the cylinder dry out enough to start its just getting to much gas for start
2007-07-01 04:16:59 · answer #5 · answered by Anonymous · 0⤊ 0⤋
there is a minimum cranking speed and battery requirement for this motor you need to check your battery and starter circuit for problems carbon deposits dont happen overnight
2007-07-01 09:58:34 · answer #6 · answered by gmc 4 · 0⤊ 0⤋
could be flywheel magnets loose. could be the low-speed coil in the stator is bad...which means r/r the stator.
2007-07-01 06:15:20 · answer #7 · answered by Anonymous · 0⤊ 0⤋