What should I do if my carb jetting is not working?
Once the bottom end or low RPM area is running correctly, it is time to address the mid-range RPM, also known as the acceleration portion of riding. Problems in this RPM range are corrected by adjusting or changing the fluid needle located in the top of the carburetor.
How to correct a carb jetting motorcycle backfire?
Start the motorcycle cold with the choke on and see if there are any signs that it is loading up with fuel. Decrease the choke to lessen the fuel. Allow the bike to warm up to riding temperature, about two minutes. How does the bike respond to a standing throttle range? Is it smooth in the low RPM range from idle to about 1200?
Why does my carb jetting start on fire?
Be sure that the fuel is going down the OEM drain hoses into the drain pan on the floor. Do not allow the fuel to run down the engine. This can ruin block paint. Or worse, fuel can spill on to the starter motor or hot pipes, causing a fire when the bike is cranked.
Can a needle be adjusted on a carb jetting?
If your needles can be adjusted, there will be a clip on the needle and possibly a washer under the clip. The lower the needle hangs into the carb, the less fuel you get. By adding a washer under the clip or needle head, you raise the needle up out of the carb, thereby increasing fuel supply in the mid RPM range.
What causes the carburetor on a Harley to slow down?
If there is a vacuum leak the gas will be drawn into the leak and cause the engine RPM to slow or fluctuate. DO NOT PERFORM THIS NEAR AN OPEN FLAME. Again it should be emphasized, the #1 cause of carburetor related problems on a Harley or other V-Twin motorcycle is VACUUM LEAKS.
How big is a Sportster carburetor jet engine?
Sportster Carburetor Jet Sizes. KEIHIN CARBURETOR MAIN JET SIZES 1988 TO 2006. Year 1988 Engine 883 – Jet Size 170 (California 165) Year 1988 Engine 1200 – Jet Size 200 (California 180)
What do you do to a carburetor jet on a Harley?
New accelerator pump – rejetted both the pilot and main using a 48/190 jet package – replaced all the screws with allen caps & added a lock washer. Supreme change. Low end power restored – smooth top end response with a little extra on top. No decel popping & no idle fluttering. But the most significant change was restoring the heartbeat.
Why does my V-twin have a slow jet?
No big deal just carry a srewdriver with ya and make things a little richer. Dont know about 883’s ..but with a 1200 they come with a slow jet that is too small.Putting in a #45 slow jet cured my problem with that.Only other thing that will cause it on occasion is inferior 92 octane (in other words-crappy gas).