NOTE – Advanced Options – You can just go with the default settings here as all motorcycles are factory set to run at sea level and at 20′ Celsius (68′ Fahrenheit).
For example: Carburetor number 17058201 followed by a Julian date of 1238 would have been built the 123rd day of 1978. The bike only stays on if the choke is on. For example, a jet may be stamped (on its head) with the number 30. When the operating altitude of the engine will be 2000 feet higher than your normal altitude, you'll need to insert a jet one or two sizes smaller than the size currently installed in the carb, which reduces the amount of fuel entering the engine to match the reduced level of oxygen in the air.
42.5 (pilot jet).
This gives you a good place to start your fine tuning.Needles are a little trickier, I think each needle clip was worth a change in CF of 0.1 on my KX. Below are 2 different carbs, one has parts circled in yellow and another carb has parts circled in orange.
Carburetor Jet Size Calculator. As mentioned in step 1, you'll need to increase the jet size for lower altitudes, while a smaller jet size will be needed for higher altitudes. Below are 2 different carbs, one has parts circled in yellow and another carb has parts circled in orange. You can calculate that the jets should be increased by exactly one size. You need to fiddle with the slow circuit more.
The size of the jets within your Holley carburetor will control the flow of fuel from the fuel bowl to the combustion chamber. The jets on a carburetor meter the amount of fuel that enters the throttle bores of the carburetor where it mixes with incoming air. When the operating altitude of the engine will be 2000 feet higher than your normal altitude, you'll need to insert a jet one or two sizes smaller than the size currently installed in the carb, which reduces the amount of fuel entering the engine to match the reduced level of oxygen in the air. Once I fully close it, the bike shuts off even when the engine is warm. Price is for 1 jet. If you go to sea level to race on a 70 degree day this is what you should try first. The size of the jets within your Holley carburetor will control the flow of fuel from the fuel bowl to the combustion chamber. Second the jets need to be located.
The Higher the Jet Number the Bigger the hole init so more fuel goes into engine to make it richer, the smaller = vice versa less fuel means lean running. CF=1 for sea level, 70 degrees F. If it is 80 F at 5000 ft, you calculate a new CF, say 0.9 (this is just an example).
To submit your questions or ideas, or to simply learn more about It Still Works, Each jet is stamped with its size, so adjustments can be made without measuring. Remember, its a good place to start but is not the same as jetting by someone who is good at it. Holley jets range in size from 40 to 99, with the stock jet size differing based on the carburetor model and engine application. To submit your questions or ideas, or to simply learn more about It Still Works, Each jet is stamped with its size, so adjustments can be made without measuring. I made it into a table and pasted it on the inside of my toolbox lid. The first three numbers are the Day of the Year the carburetor was built; the last number is the Year. Second the jets need to be located. The jet sizes for Carb 1: 110 (main), 130 (pilot air), 42.5 (pilot jet). Up hill works best.If the motor is back firing at decel this is a good indication the pilot jet is to lean. When the 1st number is 4, then the jet size is .100 inch or more. This is probably to avoid engraving “.5” on the jets PART NUMBER PICTURE DIMENSIONS SIZES 99-101-357-SIZE 6mm Hex head M5x0.8 Thread 16.5mm Length 80-190 (Δ 2/3) 195-220 (Δ 5) 220-230 (Δ 10) 99-101-393-SIZE 6mm Slot Head M5x0.8 Thread 8mm Length 60-200 (Δ 2/3)… Read More »
Be sure you are full throttle under load for at leased 200 yards or so. Save the gasket that was pressed between fuel bowl and the carburetor's metering block (what the fuel bowl is bolted to). Eg: 100,102,105,108,110. Screw the new jet(s) into the jet mount(s) in the metering block and press the fuel bowl gasket and bowl to the metering block.Tighten the bolts of the fuel bowl to complete the jet sizing change. We are passionate about carburetor repairs and we want to share our passion with you.
For Denver: Take 0.948(Denver atmospheric pressure at 70 degrees) x jet size(60) = new jet size(56.88) round up 57 would be the proper jet size to start at for a stock scooter using a 12mm carburetor. If the air temp raises above 105 degrees, larger jets will be needed to increase the amount of fuel entering the combustion chamber, known as a "rich" condition. This of course assumes that you are starting out with the stock jet size. If not running (idling around 1k RPM) optimally between 1/2 and 2 1/2 turns out, change the pilot. If you go more than 2 1/2 turns to get rid of backfiring, change the pilot richer (bigger).I have the formula at home, I will get it and post it. This would improve power and mileage. The jets are under the float bowl cover. Keihin Jets are sized in steps of 2 and 3. A # 100 jet is 1.00mm in diiameter. This larger jet sizing may foul your spark plugs, but that's better than burning up your pistons. If the carb continues to under perform, remove the bowl and make another one to two jet sizing adjustment, either up or down based on your circumstances, until the engine runs well.Install a smaller jet size if the ambient temperature dips below 35-degrees Fahrenheit.
Replace the jets with a larger jet sizing by two to three sizes. If you decide to test the engine by experimenting with different jet sizing, always start with a larger jet size than you deem necessary. First identify the carb manufacturer, mikuni, keihin, hitachi, holley. FREE SHIPPING OVER $150 (We are still shipping parts during this epidemic) Thanks again for the support! The jet sizes for Carb 1: 110 (main), 130 (pilot air), 42.5 (pilot jet).
So you should try a 187 * .918= 172.
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