Two stroke blubbering

[Wahoo Sails]

The Nissan 8 horse on my dinghy has taken to blubbering excessively. It has one speed (I would guess around 3000 rpm) where it runs just fine ... try and go slower or faster and it wants to "blubber" ... anybody know what causes this?
Bob

[Vasco]

Had one of these great little motors a while ago. The problem's usually the carburetor. Take it all apart (fairly easily done) and clean with a can of spray carb cleaner. Make sure you clean the jets and the reed valve too. Wouldn't hurt to put clean plugs in too.

[Alan Wheeler]

Check, clean and or replace the plugs. Ensure you have fresh clean fuel. Ensure you have the correct mix of oil.
I recomend using a synthetic mix oil. Amzoil has a great one. This means you can run 100:1 instead of 50:1 which aids in keeping the plugs running clean. the full synthetic Amzoil greatly reduces smoke emmision from any two stroke.
no I have no affiliation with Amzoil, I just use the product and the more I have used, the more impressed with it I am getting. Expensive though darn it. I want to put Amzoil in my boat engine, but it will cost me over $400 to do so. I would mean a change every 1000hrs, but ya have to have $400 don;t ya.

[SkiprJohn]

Ethanol fuels and their carb clogging characteristics will cause what Wahoo describes too. We're going through that problem here in Hawaii where all our gas stations have converted to Ethanol and we can't get good gas for our outboards/weedwhackers/mowers etc..
JohnL

[Wahoo Sails]

Been a while since I posted this, but finally found the cure ... bad needle & seat in the carb. I can't prove one way or the other, but John L might be right ... itty bitty rubber tip on the needle may have not been compatible with the new fuels ..... for that matter .... the replacement one might not be either.
Bob