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Compare Products Compare Products. Price History Features. Fit for cc and cc GY6 carburetors. Cable luber Makes lubricating cables simple. This set is more suitable for chainsaws, grass trimmers, blowers etc. This 92 page manual includes exploded parts views, parts listings and optional parts. Guides you through tuning and trouble shooting for the popular lines of Mikuni Carburetors. The definite reference for Mikuni Carburetors and a must for any do-it-yourself type.
A handy pocket-size calculator which can be used to determine jetting due to elevation and temperature changes. The Use for both single and multi-carburetor applications on two-stroke and four-stroke engines. It also has a guide for determining rich or lean carburetor conditions.
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Login to Your Account. Remember Me? Register Forgot password? What's New? Forum Manufacturing Today General Carburetor jet measurment. Likes: 0.
Results 1 to 20 of Thread: Carburetor jet measurment. Thread Tools Show Printable Version. Carburetor jet measurment I'm trying to figure out what the measurment scale for carburetor jets is based off of. I want to be able to check the orfice size with a gage pin to see if it's worn out. The jet is stamped What is the orfice size of these jets in thousands? Are furnace and hot water tank gas jets measured the same way? Is there a formula for converting to a decimal diameter? Thanks, Don.
Ironhead is right. It is an arbitrary number. Some manufacturers go up in number when going smaller and some go down. As far as worn out jets go, personally I think jets wearing out is a myth. I am sure there are cases where it has happened, but I have never seen it. I spent about 5 years rebuilding carbs of all types.
Updraft, downdraft, side draft, etc etc. In the 70's we would take 2 bbl Ford v-8 carbs and drill out the jets one number size larger. This would improve power and mileage. The number should reflect the "Flow" of the jet. Since there are several thngs that can affect that, the hole size won't necesarily track what you think.
You could take a new jet, and measure it, and compare it to the worn jet, but only if from the same manufacturere, not another vendor of "equivalent" jets or just swap them, and compare results.
Chances are good to ruin the jet by using a gage pin. Jets are tested for the amount of flow in the flow direction read this again until you understand it. Comparing jets can be done with a fixed amount of fuel and a stopwatch. Mikunis, Keihins and European makes are most of the time dead nuts the same out of the box, so the stamping ist right. Other asian stuff is sometimes at least inconsistent Get an ultrasonic cleaner with the right cleaning solution and throw in the jets.
Same thing for the carbs, most carb problems are not from the jets but from clogged or messy holes that hinder the airflow to certain parts of the carb or disturb fuelflow at higher rpm. If the problem persists pull the pet cock and clean both fuelfilter and the tank itself.
And if you tune a bike yourself, buy the handful of jets you may need new from a trusted dealer. Jets are cheap, motors are not. Greetings, Johann. I was wondering about jet sizes myself sometime back. My question was specifically for a GM model 4G carburetor. Upon checking the jets with pin gauges, I found that the jet size was just the diameter of the orifice in thousandths in this particular case.
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