Shown in the Above Diagram and below on the Mikuni Catalog Pages are the operational ranges that the different jetting systems (Main Jet, Jet Needle, Needle Jet, Throttle Valve, and Pilot System) work in relation to the throttle slide position as it moves up and down inside the carburetor's throttle bore. Carburator Theory and Tuning. ¶ For some reason everyone seems to think tuning a carb is just real easy. Change a jet or two and boom, your there. Yeah, right! There are quite literally millions and millions of jet combinations. A rough check on Bing carbs shows there are at least 13,860,000 different combinations of jets. See tuning guide: Hop-up Tips Carb Jetting-Each thing that you change will effect the carb jetting. It is not possible to tell you exactly what jets to run. Carb jetting is time consuming but dollar for dollar will pay off in performance more than any part you can buy. Here's some instructions for jetting a carb: This carb fits BSA Singles, Triumph 650 twins and other British motorcycles with a 30mm Amal carb, or single carb application. This will bolt right on to the manifold flange and use your stock cable and air filter or Triumph TR6. These will fit a standard flange mount manifold with a h*** spacing of 2 on center. Buyer's Guide. 2022 Honda CB650R. Reviews. 2022 CFMoto 700CL-X and 700CL-X Sport First Ride Review. News. Ducati CEO Rides and Talks MotoE. News. Royal Enfield Readies New 650 Cruisers. News. We are confident that you will agree with us that your new Mikuni carburetor is one of the best modifications you have made to your Harley-Davidson motorcycle. The Mikuni substantially increases power compared to the stock carburetor. However it is the dramatic improvement in throttle response that makes the Mikuni flatslide HSR carburetors Then turn clockwaise the air screw till the idle speed starts to drop off rapidly and return the screw position to just before that. This should result to be within 1+1/2 to 2 turns out. If it is less than 1+1/2 turn then you may need a bigger idle jet. If it is more than 2 turns then you may need a smaller idle jet. Depending on the inside diameter of the needle jet, it will affect the jet needle. The needle jet and jet needle work together to control the fuel flow between the 1/8 thru 3/4 range. Most of the tuning for this range is done to the jet needle, and not the needle jet. FIG 4 . The main jet controls fuel flow from 3/4 thru full throttle, fig 5 have determined the correct jetting for your engine make a note of the temperature and altitude of your location at that time. You should then convert your jetting to the baseline 1.00 condition of jet sizes on the chart. (for example if you determined your correct main jet to be a #188 at 95 degrees F and 3200 ft based on single jet. Please order Large Hex Main Jets in multiples of 4. † 6mm hex width, 5mm thread diameter Jet Size: (Increments) 50 thru 200 (5) OEM Carbs, Banshee Banshee OEM , OEM applications TCI PART#M28/1001 - Jet Size $ 3.49-J † Length 5.5mm, Outer Diameter 4mm Jet Size: (Increments) Want to know what those screws and jet needle slots do? Tuning Mikuni piston slide carburetors, the basics. A clean Mikuni carburetor with a properly adjuste Want to know what those screws and jet needle slots do? Tuning Mikuni piston slide carburetors, the basics. A clean Mikuni carburetor with a properly adjuste Designed to fit Honda Goldwing GL1000-1100 models. Manifold