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Do you need to clean your carburettor before tuning it?
However, if correcting the oil level does not resolve the problem, you may need to clean the carburettor (See Checking and cleaning an SU carburettor ) before tuning it. Whenever possible, make adjustments with the air cleaner in place removing it alters the partial vacuum inside the carburettor.
How to diagnose a SU carburetter fault?
1 Slacken the filter plug on the AED. Crank the engine; fuel should leak from the plug. If no fuel, check the system leading to the AED. If fuel is present, tighten the plug. Then carry out check 2 under symptom A. 2 Note: This check is not applicable when AED temperature is above 35°C (95°F). Crank the engine for several seconds.
What should the oil level be on a SU carburettor?
On older SU carburettors, which have a vent hole in the screw-in plastic top of the dashpot, the oil level should be i in. (13 mm) above the top of the piston tube. On dustproof SUs, which have a hole in the dashpot neck instead of the top, the oil should be i in. (13 mm) below the piston top.
How big is the needle on a SU carburetor?
The needle is a precision piece, with nine to 16 specific diameters measured during the manufacturing process to ensure proper fuel flow throughout the range of air flow to the carb. Thus, the SU self-adjusts to the air/fuel requirements of an engine.
What is the low rpm jet on a carb?
Low rpm operation is controlled by the intermediate jet (#11). If sneezing or popping is experienced below approximately 3000 rpm’s the intermediate jet must be replaced with a larger sized (richer) jet.
How are carbs synchronized in a SU carburetor?
After the carbs are synchronized at idle, the throttle linkages can then be adjusted to ensure they remain synchronized throughout the rpm range. With just a little free play in the linkage, each throttle arm should start moving at the same time when the accelerator pedal is depressed.
What should the idle speed be on a carb?
Start bike, bring to operating temperature. Set idle speed adjusting screw, clockwise to increase rpm, counter-clockwise to decrease rpm. Idle rpm range should be 950 to 1050 rpms. Adjust idle mixture by turning idle mixture screw slowly clockwise until the engine runs poorly. Note position.