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Need help getting a 1999 6hp Johnson 2 stroke to run with maybe 40 hours of use on it.

Back Ground: The motor has sat for about 10 months and was serviced by a professional mechanic about 14 months ago. It ran fine last time I used it but now it won’t start.

What I have done so far: Since it sat for this long I drained the gas and cleaned all the lines, both on the tank and in the motor. Check and cleaned both spark plugs. Filled tank with 93 octane gas and tried to start but nothing. Pulled plugs again to see if motor was flooded but looked good. Pulled the air filter to get to the carb. The carb looked new with no grease build up. Tried to start again but nothing. Check the fuel lines again to make sure nothing was clogged. They looked good but still no go. Put gas directly in carb and it ran for a few seconds. Did this several time but the motor never stayed running. Even sprayed carb cleaner but nothing.

When I drained the gas before I tried to start it I noticed it had a milky look to it. That gas was probable inside the block thus the reason I put gas directly in the carb thinking it might blow any crud out.

Before I take it to the mechanic I was hoping one of you might have another idea of something I can try. All suggestions are appreciated.

Since the motor runs when you put gas directly into the carb, my first thought would be to check the jets in the carb. You may need a carb kit. I think you may have already done the following but if not make sure the line from the tank to the carb is open. If there is a filter between the two, change it. If there isn't one, put one in.

I agree with Sir Reel. FWIW

FWIW ... not much But thanks anyway

Got no suggestions other than what you've tried. Really sounds like fuel filter. If it was jets, I'd think it wouldn't start when you put gas directly into carbs. I bought a 1999 6hp johnson brand new once. Most aggravating little motor to crank I ever owned. Especially if it sat very long. Check to see if there is a filter where it goes into carb.

Not a mechanic by no means, but I had similar problem with my 4-wheeler this year. I was able to get a can of Seafoam (I run it in everything now) and add to the gas. I turned it over for about 15 seconds for or five times. Then I would let it sit for a couple of minutes. After the third series it finally fired and runs fine now. That Seafoam will help break up the gunk and clean out the fuel system. It also helps break down any moisture that may be in the tank. Seafoam is worth it's weight in gold to me.

Good luck.

Does this motor have a gravity feed tank or does it have a separate tank from the motor? If it's separate, it could well be that the diaphragm for the fuel pump dried out and split, thus making it not pump fuel. If the fuel line goes into a small rectangular piece and then out to the carb, the rectangular piece is the pump and is easy to remove and replace the diaphragm in it

Just pulled the carb apart and think I found the problem. There was a bunch of black gunk in a brass fuel tube that was inside the carb. Now I just need to remember how it all goes back togeather. Thanks for the help. Once I figure out how it goes back togeather we will see if that did the job.

Sir reel wrote: FWIW ... not much But thanks anyway

NO CHARGE BRO!