If your Kawasaki motorcycle is having trouble starting or runs rough after a long period on inactivity, you may have a problem with the motorcycle's carburettors. Most likely, the small jets and passages within the carburettor have become clogged by debris or build-up, preventing fuel from reaching the motor. This can be caused by debris in the fuel tank, or more often, from the degradation of fuel over time, which creates a sticky "goo" that clogs the jets. The only effective method to remove these clogs is to disassemble the carburettor and clean it out.
- Skill level:
Things you need
- Aerosol carburettor cleaner
- Compressed air
- Plastic bags
- Lemon juice
- Metal pot
Turn the fuel valve off and remove the drain screw from the carburettor's float bowl with a screwdriver. Drain the remaining fuel in the float bowl into a container. Remove the carburettor from the motorcycle and place it on a clean, level work area.
Disassemble the carburettor. Use a screwdriver to remove the float bowl and top cover from the carburettor. Carefully remove the carburettor's gaskets. Pull the diaphragm and spring out of the top of the carburettor. Remove the brass slide in the throttle valve, using a screwdriver to remove its mounting bolts, and pull the slide out of the carburettor. Place these in individual marked plastic bags to prevent loss.
Remove the jets from the lower portion of the carburettor with a small flat screwdriver. Clean each jet as you remove them, spraying the jet with carburettor cleaner and clearing the jet's passages with compressed air. Place the jets in marked plastic bags.
Clear the passages in the carburettor with carburettor cleaner and compressed air. Spray the float bowl liberally with carburettor cleaner and clear any passages in the float bowl with compressed air.
Mix a solution of 1 part lemon juice to 6 parts water in a metal pot. Place the solution over a hotplate and heat to a gentle boil. Submerge the entire carburettor and float bowl into the solution and allow it to soak for 20 minutes.
Remove the carburettor and float bowl from the solution and rinse immediately with clean water. Scrub the carburettor with a toothbrush to remove any remaining debris or build up and rinse thoroughly. Dry the carburettor with compressed air, directing the air into the fuel passages to dislodge any trapped water and loosened debris.
Reassemble the carburettor and install it onto the motorcycle.
Tips and warnings
- Add a fuel stabiliser into the fuel supply to prevent fuel degradation over long periods of storage.
- Add an inline fuel filter between the fuel tank and the carburettor to prevent debris or rust within the tank from fouling the carburettor.
- Mark and bag all parts as you remove them to keep from losing them.
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