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To form a proper homogeneous inflammable mixture of fuel and air.Changes in atmospheric pressure and air temperature.FACTORS WHICH CAN ALSO AFFECT THE CARBURATION.Selection of correct pump cam and pump jet.Selection of the throttle valve cutaway. #DELLORTO VHSB 38 MANUAL FULL#Full throttle system as usually used on four-stroke engines.Full throttle system as usually used on two-stroke engines.Selection of the correct size of idle jet.Setting the idle with an air adjusting-screw.Setting the idle with a mixture adjusting-screw.Selection of starter emulsion tube and starter jet.Selection of the correct carburettor size.OPERATION, SELECTION OF CORRECT PARTS, TUNING AND USE.Carburettor diagram and principal parts.Please contact Gregory Bender with any questions, corrections, or suggestions for improvement.Ī GUIDE TO THE CHOICE, SETTING AND USE OF TAPERED NEEDLE MOTORCYCLE CARBURETTORS Technical : The complex stuff - exciting but heavy reading, take your time. O-rings, seals, and gaskets - what you need to repair. Special tools - see why you'll need them. Gearing - Contains a nice utility for calculating gear ratios, Wiring - more warnings than help, I guess.Ĭarburetor - drawings, charts, and a how-to guide. Tuning - information on what will make it go faster. Gasoline - will a Moto Guzzi run on unleaded gasoline ?Įxpected mileage of parts - a VERY rough guide to the expected lifetime of various parts. Step 7: Clean the bench, put away the tools and enjoy the rest of your day :)įollow this link to purchase any of the required parts for this job or if you have any questions, please leave a comment or send an enquiry here.Moto Guzzi frame numbers - is your bike what's its supposed to be ? Tighten the 3 M5 cap screws and you are all set. ![]() #DELLORTO VHSB 38 MANUAL INSTALL#Step 6: Replace the float bowl gasket, install the floats so that you can read the weight of them when you are looking at the carburettor and install the float bowl. Step 5: Re-install the jets, starting with the smallest pilot jet. Step 3: Install air bleed screw all the way to its home position, then return it to 2 complete turns anti-clockwise. TIP: There are 3 settings for the float that we have found to work well, 23.0mm is the leanest (for wet races), 23.5mm is medium and a good all-round setting and 24.0mm is the richest and used when the engine is leaning out/hesitating off slow corners. Step 2: Install the pin and float lever and check the float lever for correct height, using your verniers. Step 1: Firstly install the new gasket and seat, followed by the needle. Your carburettor is now ready to reassemble with a new needle and seat. #DELLORTO VHSB 38 MANUAL SKIN#TIP: Use your pointy-nose pliers to hold the parts whilst cleaning to avoid skin contact with solvents. Step 7: Using your solvent/carburettor cleaner, clean all the jets and orifices and dry with compressed air. Step 6: Use the side-cutters to remove the pin and float lever, then, using the 9mm socket remove the old seat and needle (remembering to remove the old seat gasket at the same time). Make a note of the measurement, so that when you replace the needle and seat, you can adjust to the same measurement. Step 5: Measure your float height with a set of digital verniers. Step 4: Using a flat blade screwdriver, remove the air bleed screw. Step 3: Remove fuel sieve with the 12mm ring spanner. Step 2: Remove the jets with a flat blade screwdriver. Step 1: Remove the 3 cap screws with a 4mm allen key. Please remember leave any comments or questions below.ĬAUTION: Always remember to wear safety glasses when using solvents, particularly if you will also be using compressed air. Here we will break down the steps in a little more detail for you, as well as providing images and links to purchase the parts. #DELLORTO VHSB 38 MANUAL HOW TO#We recently posted a video to the Power Republic YouTube Channel showing you how to service your Dellorto VHSB 34 carburettor for a Rotax Max 125 go-kart engine. ![]()
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