Carburetor Jetting Software
admin 27.10.2019
Rejetting carbs can be a real hassle. In this post I’ll explain the process of rejetting your carburetors in 3 simple steps:. Main adjustment (main jets).
Found this info and though it may be useful. I was thinking a.036 was too big for my 107 but I was wrong. S&S Super E (1 7/8' Carburetor) Initial Jetting Settings.
Keihin carburetors are designed to be used with normal pump gasoline. Fuels that contain over 10% alcohol content may damage parts in the carburetors. This may prevent the carburetor from functioning properly. Jetting Your Slide Valve Carburetor (PDF) Jetting Your CDKII Diaphragm Carburetor (PDF) Jet List (PDF) Slide Chart (PDF). Above ground swimming pool liner installers. Jet-Plus, software for calculating the correct jetting or fuel control setting for your race vehicle to suit the current ambient conditions.
Fine adjustment (gas needle + air adjustment). Stationary adjustment (air screw / fuel screw)Before you startA carburetor has a lot of parts in it that consist of “soft” materials. That means that carbs will wear out over time. To make sure that your parts are in mint condition, it’s advised to use a carburetor rebuild kit. Since the materials are soft you have to work on them with proper tools and care!Parts overview:Carburetors come in a lot of different types but in general, they all work the same and have the same parts inside. Below is an overview of the most important parts inside the carburetor:1.
Main adjustment (main jets)The most important part of rejetting carbs is the main adjustment because the main jets are influencing all other adjustments. The main jets regulates the air/fuel mixture when the throttle is fully opened (braaaaaaaaaaaap!!). 1/4 to 3/4 throttle are regulated by the gas needle.First of all, it’s important to have the motorcycle running (how it’s running does not matter).
Take it for a small ride (1 or 2 miles) to warm up the engine, open up the throttle and shut it off while riding. Stop the motorcycle and remove the spark plug. The spark plug can tell you what happens inside the cylinder and what the overall operating condition of your engine is:The guys from Jets ‘r Us wrote a detailed guide on how to “read” your spark plugs, including pictures: check it out. Here you’ll find another color chart:. In general, you´re looking for a spark plug that is dry and has a coffee color without too much carbon (a little carbon is no problem). Any unusual colors, moisture or other “stuff” should be a red flag. Use the color charts to determine what your plugs tell you.
Carburetor Jetting Calculator
Rich & lean fuel/air mixtureNext to the spark plug, the overall running condition of your engine can tell you more about the fuel/air mixture. Below is a chart that can help you.