Question about 1985 kawasaki KE 125

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Hi I have rebuilt the bike with a rebore due to some scoring and fitted new crank seals, the bike has only done 1200 miles from new, it runs real bad and has lots of fuel blowing back thru the carb. Any ideas please?

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Your carb is gummed up from old fuel. ALWAYS have a fire extinguisher on hand when working on carburetors.
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 ). Your gas tank should be removed , dumped and flushed out. Install an in-line fuel filter. If the tank is badly rusted, Google kreem fuel tank liner or go to www. I

Drain the carburetor. There should be a plug on the bottom or a bolt on the lower side of the carb float bowl. Remove it 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 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.

After sitting for 24 years the crank bearings may be in bad shape. Remove the left case cover and lift the flywheel up and down and left and right. The flywheel should be rock solid with no movement at all.
This shows a 1983 carb. Yours will be very similar.
Hi I have rebuilt the bike with a rebore due to - f31864c.gif

Posted on Jun 25, 2009


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Most late modle MX & enduro (from about 1990 on plus some even earlier)
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This is a very thin plating on the alloy cylinder. They use this so as to allow heat to dissipate quicker & can run tighter piston cylinder tolerances for improved performance.
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No, they can't be re-bored(like the older style steel sleeved bore bikes could)
Yes, they can be honed but it requires a special type of hone(finger type bottle brush style hone).
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