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I have an old 175 it is hard to start and dont idle well what should the plug gap be

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Gap should be .028. Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
Drain the carburetor. There should be a screw on the lower side or bottom of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK B8ES spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine.

If the bike still rund poorly, check the crank bearings. Remove the left case cover. Hold the flywheel firmly in your hand. Lift it up and down then move it left and right. Any movement or is it rock solid? If movement then you will need to take the engine apart and install new crank bearings and seals. File or replace the points and set at .015 gap with the points arm on the high point of the cam.

While you are checking things, pull the cylinder head and de-carbon the head and cylinder. Run the piston down and check the exhaust port. Over the years carbon may have built up in the port and plugged it nearly closed. It should be about the size of the intake port. Remove the buildup to allow the engine to breathe. Please rate this solution. Thanks!

Posted on Aug 26, 2010

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