When do you need to Rejet a carburetor?
If you’re just swapping the exhaust with a new one of the same type, there’s probably no need to rejet your carburetor at all. Where it becomes an issue is when you are installing a stronger or tuned exhaust. Doing so raises the running temperature of your engine and more fuel is needed to compensate. This requires a larger jet.
How does carburetor jetting work on a Harley?
Install the carburetor back onto the bike and perform the tuning procedure as described under Carburetor Tuning. As you can see, Harley carburetor jetting is a fairly simple procedure that under most conditions will yield greater performance when requiring a richer fuel mixture.
How does a jet carburetor affect the fuel mix?
Both modifications will lean out the air-fuel mix. The stock jet can only allow a certain amount of fuel to pass through and is designed according to the specification of the vehicle. Installing larger jets increases fuel to the carburetor to restore the 14 parts air to 1 part fuel optimum mix. This mixture is called stoichiometric ratio.
Do you need to change the carburetor after changing the exhaust?
Replacing an exhaust with a carburetor-type engine is more than just bolting on a new pipe. Whether it’s a car or motorcycle or scooter, you are likely going to need to make sure your carburetor is running with the correct jetting for the new exhaust.
How much horsepower do you get with a hypercharger?
Normally, replacing a stock air cleaner with a Hypercharger will net you a 7-9 horsepower increase at the rear wheel, with no other modifications! Add a carb recalibration kit, a good performance exhaust system (not drag pipes) and a 12-14 horsepower increase is normal.
Where are the Jets located on a 4160 carburetor?
The jets are accessed by removing the fuel bowls on each end of the carburetor. But there is an important exception: 4160 carburetors (such as most O-3310’s and O-1850’s) do not have replaceable jets on the secondary side. In place of the jet block is a special metering plate.
Can a hypercharger be used as an air cleaner?
The Hypercharger set the standard over 20 years ago as the benchmark in V-twin performance! Normally, replacing a stock air cleaner with a Hypercharger will net you a 7-9 horsepower increase at the rear wheel, with no other modifications!
Do you have to re-drill Jets in Holley carburetor?
As a result, jets should never be re-drilled, nor should they be strung on a piece of wire for storage. Jets aren’t the only components to consider when it comes to richening the fuel circuits in your Holley carburetor.