Small engine adustment


Old 03-16-02, 03:13 PM
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Small engine adustment

I have several small engines that all exhibit the same problem: They will run when primed with starting fluid but stop as soon as they use up the fluid. Does anyone know of a a common fix for this problem? They have been sitting for some time.
I did have success with aerosol carb cleaner on one, but it took much too long. Also, does anyone one know of any general principles of carb adjustment on small engines? Any help would be appreciated.
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Old 03-16-02, 07:47 PM
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Hello and Welcome Terry to our Do-It-Yourself Web Site and our Small Engine forum.

The common condition causing the problems is stale fuel. Fuel left in the float bowls of carbs turns to vanish and gums up the fuel passages inside the carb. The same conditions occur in diaphram carbs.

Once the condition occurs in a carb, about the only successful correction is to disassemble the carb and clean it out. All fuel passages and fuel ports must be cleaned and cleared as well as the fuel bowl.

Diaphram carbs usually require a new diaphram. Successful carb cleaning for all types of carbs oftens requires replacement of the needle and seat as well.

Stale fuel left in fuel storeage cans will turn stale and if used will also gum up carbs. The trick for 2 cycle fuels is never to pre mix more fuel then can be used in a month or store regular fuel for more then a month.

Without knowing the engines and carb types your referring to specifically, if your going to remove the carbs and clean them out, first turn any fuel or air screw inwards while counting the turns it takes to lightly bottom the screw in.

Then remove the screw. When reinstalling the screw, turn it in all the way until it lightly bottoms. Then unscrew it outwards the same number of turns it took to bottom it out. Doing this will insure returning the screw to as close to it's orginal setting as possible. A minor adjustment to the screw or screws may be needed after reinstalling the carb and running the engine.

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