How to Make Yammy 90 2 Stroke Oil Injected Run Smoother at low RPM?

[TSCTSC]

Aside from using Sea Foam, what else can be done to make a 2 stroke run smoother at low idle speeds? Will Shock treatment be useful or some other method? Thanks

[blacksheep]

i would find the best sythetic you could, possibly something from amzoil.

[Northlander]

I would also recomend trying Amsoil. I run their 4 stroke in my yamaha 115 4 and love it. I ran their 2 stroke in my old yamaha 25 horse and it sure made a difference. Easier starts, smoother at trolling speeds and way less smoking.

I also run their oils in my mower, snowblower, weedeaters, Ice Auger and it hasnt let me down in any of them.

[Surface Tension]

Sea Foam decarbs the engine. You can use it on a regular basis or as a shock treatment. It isn't a cure all product.

Assuming you've done the sea foam already and the engine is still running rough. Using a syn-oil may or may not improve your idle but your only treating the symptom. After all your engine should run smooth using a 2 stroke oil if everything is right. Theres quite a few things that'll cause a rough idle. Air/gas mixture, ignition, bad seals, low compression to name a few. Start with inspecting the old plugs, they'll tell you a lot. Then replace along with the fuel filter. Inspect the fuel line and connections then go onto checking the compression. Next would be carb adjustment and most likely a cleaning which goes back to the Sea Foam. I know they claim it to be a carb cleaner along with a fuel stabilizer but as I mentioned its a good engine decarber.

IMO your better off using a product who's use is specific to one task. So when I want to treat gas for storage I use Stabil or if I want to clean a carb I use a carb cleaner like Gumout. Those products are made to do one thing.

[delmuts]

i had the same problem when i bought my current boat.( 1990 90 hp. yam) it wouldn't idle,would cut out alot! finally took it to a shop where they cleaned the carbs.( they showed me how much gunk was on the idle screws and such. after they got done it runs like a dream. they told me to always run seafoam in the gas. to help keep the carbs clean.

[TSCTSC]

Well, brought my boat to the dealer. Told them my problem. They changed the plugs and changed the gear oil. That was it. They never heard of shock treatment and they did not clean my carbs. So how do I go ahead to clean my carbs. Can someone walk me through it? I have never worked on a outboard before but I am a fast learner and I have done quite a bit of work on my boat expect the motor. Thanks!