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How to tune the carburetor of your Royal Enfield Bullet
Tuning Pro.= I belive ur machine is Elec-CI350cc. So that means ur machine has 3 setting screw, carb = 2 tunning screws and emission controlling unit = auxy screw which is known as Auxilary Air Screw.
Step 1. Keep one table fan from front side for cooling the engine. (On High RPM, coz for newbie it takes some time to learn the setting, so engine might get overheat during the session, don't mind please)
Step 2. Engine should be warmed up for atleast 2 mins.
Step 3. Slightly increase the RPM so the bike will not stop.
Step 4. Close the auxilary screw which is given on the inlet manifold. Location of the screw is in between carburetor and head, one rubber pipe is connected to the same part , one end goes to resonator box(AirFilter-Chrome Plated) and another end of that pipe is connected to emission controlling kit. Equal tightening please coz we just have to close the port for some time. Do not over tight otherwise u may loose the threading portion of that alloy part.
Step 5. As u know ur carb is VM24, so the setting of Pilot screw or AF screw is in between 1 1/2 to 2 full turns.
Step 6. U should be able to feel some moisture from exhuast tail pipe.
Step 7. Decreasethe RPM by turning idling screw to lower side. Keep the idling till that point where vehicle should not stop. Due to no presence of RPM meter u can't get precise RPM number. So judgement......
Step 8. You are set with two screws till now. The next screw is Auxilary screw. Now u have to release the screw by unscrewing anti clockwise till u feel the RPM is getting HIGH. Auxilary screw increases the RPM. The point at which u will find RPM is high stop there coz if u turn it more RPM will go low. Exact point is the point where Left or Right turning will decrease the RPM. So that is the main setting point for auxy screw. Generally it comes near to 1/2 to 1 turn. depends on carb cleaning and engine overall condition.
Step 9. After setting up the auxy screw, again lower the RPM by turning Idling screw n set it near to 800 RPM.
Step 10. Checking the perfect idling
This way u are set to get good milage out of it. No lean no Rich. If u feel moisture or water droplets from exhaust tail then perfect setting. Sometimes u may feel chilled carburetor body.
The pleasure of riding a Bullet is the only thing bigger than the machine itself.
What else can I help you with?
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