Dirt and debris are the usual suspects when it comes to clogged carburettor jets on a Yamaha TT-R125. But long periods of inactivity can create cause problems for your dirt bike as well. Fuel has a tendency to degrade over time, changing from its highly-combustible form into a sticky, green sludge that can clog the carburettor's tiny jets and fuel passages, just like dirt would during a race. Removing and disassembling the carburettor for a good cleaning is the only way to rid your TT-R125 of either problem. Expect to spend at least two hours on this project
- Skill level:
Things you need
- 10mm socket
- Socket wrench
- Phillips screwdriver
- Flat screwdrivers
- Carburettor cleaning spray
- Compressed air
Remove the bolt from the top of the motorcycle's number plate with a 10mm socket. Unwrap the number plate's plastic strap from the handlebar. Pull the number plate away from the motorcycle. Remove the bolts from the tank shroud covers on both sides of the fuel tank with a 10mm socket. Pull the shroud covers away from the fuel tank. Turn the fuel tank's valve to the "OFF" position and pull the fuel line off of the valve. Remove the bolts from the sides and base of the fuel tank with a 10mm socket. Pull the fuel tank off of the motorcycle.
Pull the fuel line and the over flow hose off of the carburettor. Unscrew the starter plunger assembly from the top of the carburettor, just to the side of the top cover. Pull the start plunger assembly away from the carburettor. Unscrew the top cover from the carburettor. Pull the top cover, throttle cable and needle assembly out of the carburettor.
Loosen the air filter clamp and the intake manifold clamp on both ends of the carburettor with a Phillips screwdriver. Pull the air filter off of the carburettor. Pull the carburettor off of the motor's intake manifold.
Remove the drain plug from the carburettor's float bowl with a flat screwdriver. Drain the remaining fuel in the float bowl into a container. Remove the float bowl's screws with a Phillips screwdriver and pull the float bowl off of the carburettor.
Remove the float pin from the bottom of the carburettor with a punch. Remove the float and needle valve from the carburettor. Remove the pilot and main jets with a small flat screwdriver.
Clean the float bowl, jets and needle valve with a carburettor cleaning spray. Blow compressed air through the jets and float bowl's fuel passages to remove any trapped sediment or debris. Spray the carburettor's body with a carburettor cleaning spray. Blow compressed air through the carburettor housing's air and fuel passages.
Reassemble the carburettor and reinstall it onto the motorcycle following the reverse order of removal.
Tips and warnings
- Place the carburettor's screws, jets and other components into separate plastic bags as you remove them to prevent the loss of parts.
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