2006 Johnson 15 hp 2 stroke

[limacina]

So we got this sweet deal on a brand new 2006 johnson 15 hp 2 stroke that had been left over and sitting in storage (we thought) private sale, no returns.

We did a nice job breaking it in, never a consistent RPM, doubled up on oil fro first tank of fuel, and never more than 3/4 throttle.

So, I'dd guess we have 4 hours on it and its now dead. I worked it over, figured bad gas. Spark looke dgood on both plugs even with a load.I dumped gas right into the cylinder and it wouldn't fire, well it seemed to 1 out of 10 revolutions (more of a visual for you, not a real number) and spit back thru the carb.

I took it into the local boat yard, they put two different mechanics on it, the first found a broken flywheel key and fixed it but no luck running. The second got no where and took all the coils and carb off another motor in the shop to try and nothing. The head mechanic called today and said it looks like the engine is a lemon, the crank is pressed in and probably spun a bearing or something and is now the timing is out.

So, there is no warranty I'm sure and we're stuck with a dead motor.

I may tear it apart this winter and take a look; but I wanted to see what advise I could get on here. And hey, no "your screwed" posts please!!!

 

[Silvertip]

Re: 2006 Johnson 15 hp 2 stroke

Let's not be hasty with a not so very technical diagnosis. Before you rip into this thing, lets make certain you actually have to. First, since they told you a flywheel key had sheared, lets make sure they fixed it. Remove the plugs. Using a pencil with a rubber eraser, stick the pencil into the plug hole for #1 cylinder and roate the flywheel by hand. The pencil will push outward as the piston comes up. When it is out as far as it goes, the timing marks on the flywheel should be lined up with the zero degree mark or very close to it. That says the crank is not an issue. Next, do a compression test. Even holding your finger over a plug hole while someone pulls the cord is enough of a test to show whether or not there is good compression. Examine the plugs. Were they wet with fuel or black with soot or oil residue. It may be the carb needs adjusting if there are mixture adjustments on them. Did someone pull the kill switch lanyard? Continue with spark checks. Spark must be a nice "fat" snap on each cylinder. Make these checks and then post back with what you are finding. We can go from there but please provide precise details on what you are finding..