What does a bigger carb jet do?
A larger jet number means a bigger hole and more fuel. A smaller jet number has smaller holes and should be used if your engine needs to run leaner. Whether your machine is running too lean or too rich is a good starting point for choosing your jets, but using a jet calculator minimizes trial and error later.
What happens if my main jet is too big?
(A too-large main jet also mimics this symptom.) – The engine runs hot, knocks, pings and overheats. – The engine surges or hunts when cruising at part-throttle. – Popping or spitting through the carb occurs when the throttle is opened.
How do you know if your pilot jet is too rich?
If the pilot circuit is rich, the engine will have a rough idle or may not return to idle without “blipping” the throttle. You may also notice a distinct smell of raw fuel and some eye irritation from the exhaust.
What AFR is too lean?
Generally, the engine is considered to be running too lean when fuel trim is above 10% (with the engine running in closed-loop mode). If fuel trim is below -10%, the engine is typically considered to be running rich.
How many Jets does the 26mm Amal carburetor have?
The 26mm Amal has smaller threads so a larger filter will have to be sourced. (also available from JRC Engineering, please see website or catalog for details). Fig.9Jets The carburetor comes with extra jets, a pilot and four main jets. The jets can be changed easily whilst the carburetor is mounted in place on the bike. To replace the main jet, the
Are the carburetors pre-jetted?
the nipple sits in its place in the throttle slide. Fig.5 JRC Superior carburetors are pre-jetted if the application is specified upon ordering. If no application was given the carbs are supplied with the factory jetting specs. Jetting is done for the stock motorcycle not taking into account any modifications that your bike may have.
Will a Volkes carb filter fit a 26mm Amal?
The stock pancake Volkes type filter will fit as long as it has the removable insert and is for a 900 or 389 series Amal carburetor. The 26mm Amal has smaller threads so a larger filter will have to be sourced. (also available from JRC Engineering, please see website or catalog for details). Fig.9Jets
Is there a 26mm flat slide carburetor?
INSTALLATION GUIDE FOR THE JRC 26 or 30MM FLATSLIDE CARBURETOR Introduction Congratulations on your purchase of the JRC Flat slide carburetor. This carburetor has been developed to give better starting, engine performance, and throttle control for your classic motorcycle.