How do I know if my Sportster is running lean?
The first sign you’ll have of a motorcycle running lean is if you are having a rough idle. If you start the motorcycle and it has a difficult time staying on by itself or you notice a rough sputter while it’s in a stationary position, this is a good indication of a lean mixture.
Where is the fuel air mixture screw?
Look at all the different screws on the carburetor until you spot the gold one with a flat slotted head. This is the air fuel mixture screw. Most air fuel mixture screws are located on the side of the carburetor, but it depends on the specific engine.
What kind of engine does a Sportster have?
05/1200C with SI-II AC and HD 49 state script exhaust. 48 pilot, 185 main with stock needle (no shims) and 1.75 turns out on mix screw. I think I’m on the lean side on the slow, but I’m leaving it in there as I’m hitting Colorado this weekend… 48/180 seems awfully rich for an 883, but what do I know? All bikes like different things.
When to adjust the mixture on a Harley Davidson CV?
Anytime you rejet or change exhaust or air cleaner intake it is suggested to adjust the mixture. The mixture screw or EZ-Just is the key to proper tuning. These tuning steps apply to all Harley CV carbs from 1989 to present that use the CV 40mm style Harley Davidson carburetor but also apply to the CVK40 found on other models.
Where is the mixture screw on a Harley CV carburetor?
The CV style Harley carburetor has a small cylindrical tower protruding from the bottom rear of the spigot (behind the bowl). The tower is plugged with a soft metal insert covering the mixture screw. Gaining access to this screw is key to fine tuning and must be remove.
How do you adjust the idle mixture on a Harley?
Pry out the plug with a small pick. Turn the idle mixture screw in (clockwise) until it stops. Do not over-tighten the idle mixture screw. Damage to the screw and its seat may result. Turn idle mixture screw two turns out (counterclockwise) to an idle speed of 1,000 rpm. Adjust the screw 1/2 turn at a time.
The CV style Harley carburetor has a small cylindrical tower protruding from the bottom rear of the spigot (behind the bowl). The tower is plugged with a soft metal insert covering the mixture screw. Gaining access to this screw is key to fine tuning and must be remove.
Anytime you rejet or change exhaust or air cleaner intake it is suggested to adjust the mixture. The mixture screw or EZ-Just is the key to proper tuning. These tuning steps apply to all Harley CV carbs from 1989 to present that use the CV 40mm style Harley Davidson carburetor but also apply to the CVK40 found on other models.
What to do with the mixture plug on a Harley?
Pry the plug out using a pick or you could twist a small sheet metal screw into the hole and use to pull the plug out. With the plug removed clean the area around the mixture screw so no metal fragments remain.
When to use mixture screw on Harley Davidson cvk40?
The mixture screw or EZ-Just is the key to proper tuning. These tuning steps apply to all Harley CV carbs from 1989 to present that use the CV 40mm style Harley Davidson carburetor but also apply to the CVK40 found on other models.