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Tohatsu 15hp 2 stroke outboard. Approx 10 years old. Starts fine, revs fine and idles when in neutral.

But on engaging forward gear, the engine would not accelerate past approx 1/4 of throttle, added to this a stuttering sound from the outboard, and the same in reverse. Any ideas for me to try?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: I have a 1994 Yamaha 40 HP 3 cylinder 2 stroke

all 3 carbs had A  clogged jet totally dis assembled and cleaned the carbs put them back on and the engine runs great I will need to fine tone the needle valves once I put some fresh gas in it. 
Thanks John

Posted on Jul 09, 2009

  • 6 Answers

SOURCE: 35hp Johnson evinrude outboard not running at full potential

Hi, did you buy your engine used? Sounds like your gonna have to get the carb or carbs cleaned. Its possible you could have a stopped up fuel filter, or not enough spark but i am guessing its gonna be the carbs. They got some gunk in em i bet. Probably old fuel turned to gunk from setting up. I had the same problem on my 40 horse.

Posted on Aug 22, 2009

Testimonial: "Hi, thank you very much for your help, I will strip the carb down and have a look. Once again, many thanks, I am very greatful"

goldbill
  • 184 Answers

SOURCE: tohatsu outboard 15hp 2 stroke was running great,

First: with flashlight or mirror look down the carb- with switch off- and gear and throttle wide open and see what the butterfly valve inside there is doing. It should be parallel to the air flow.

If not you need to find the actuator am and be sure it moves with the control and opens all the way.

Next make sure the timing plate under the flywheel moves at the same time the throttle is opened. Then -using timing light- see if the timing is set to the correct "wide Open throttle" - this is a 2 man job done at sunset with good marks on the flywheel (don't wear a tie). This can also be done static by running it out of gas and using the pull cord- if it has no safety interlock.

Last- and the saddest part- is the compression test. The strength of the reading is not as important as the similarity. When I worked on Chryslers, they were bad if the two readings were as little as 8# apart. The minimum reading should be over 80#.

Posted on May 26, 2011

  • 107 Answers

SOURCE: 2006 Honda CRF 100. Running good,

The carb jet needle clip position controls partial throttle conditions. If it hasn't been moved from it's stock position, the needle is probably worn and should be replaced along with the main jet and the e-clip put back to the stock position. It's really hard to see if they're worn because the parts are so small. They're cheap parts and the fix is pretty simple so good luck!

Posted on Jun 12, 2011

Testimonial: "Great advice! Really helpful! Thanks"

Mikew515
  • 28 Answers

SOURCE: 2009 Buick Lucerne won't accelerate. Engine just revs.

Sound like bad transmission. Will it go into reverse?

Posted on Feb 28, 2014

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