Want more performance from your Harley-Davidson Knucklehead, 45, or UL? Already have a Mikuni carburetor, but don’t know how to adjust it? Doesn’t run “right”, and won’t respond to the changes you’ve made? Can’t make any sense of the original Japanese “instructions”? This booklet will help you!
    Mikuni VM Series “Grand Prix” carburetors have been used successfully on motorcycles for about 25 years. I’ve learned how to select and install them on older Harley-Davidson motorcycles (starting with a 45 solo over 20 years ago), including the Knucklehead, Panhead, U-Series Flathead 74” & 80”, VL Flathead, 45” Flathead solo, military & Servi-Car & K, KH & KR Models.
    Indian Chief 74 & 80 and Scout 45 owners will find this of interest, too.
    These carburetors are easy to find (click here to search for them on eBay:

) and tune, relatively inexpensive, small & compact. All sizes of this type have very similar components, with almost complete interchange within family size groups. The commentary in this booklet is limited to 30, 32, 34, 36, 38, 40 & 44mm VM carburetors, but does not cover the other CV, HS, RS, TM, TMS, TMX or OEM and proprietary models.
    My booklet includes specific choices of carburetor size and suggested jetting for Harley-Davidson 45, 45 stroker, UL & 74, and gives you something you can really use, along with many helpful hints, comments, observations, data, etc. including how to adjust for open exhaust, big cams, etc. I can’t include instructions for your motor - there are too many variables - but the bike will definitely start, idle, run acceptably with good throttle response, and allow you to make those final adjustments to get it running really sweet. Included are 25 jetting tables containing specific trial jetting suggestions for motors based on displacement and carburetor size; 13 entries for single carburetor, 12 entries for dual carburetors.
    This is not like the generic manual that came with your carburetor, but begins where they leave off, and goes far beyond into fine tuning. Not an expert mechanic? You’ll still find this useful to identify what adjustments and parts you need. All parts are easily available all over the world at reasonable prices. If you’ve considered using a Mikuni, you should read this booklet.
    I guarantee that you’ll find information in this booklet you’ve never seen before, and that will help you plan and complete your carburetor conversion.
    Consider this: if this booklet saves you from making even a single mistake or bad purchase, or gives you one new idea, doesn’t that make this purchase worth while? The price is a small fraction of what you will invest in the carburetor - plan more intelligently, and get better results. Contents are 36 pages (over 22,000 words) soft-bound, includes 30 black & white illustrations & diagrams. Information includes: »    Differences in components and function: Mikuni vs. Linkert.
»    What carburetor sizes are available, and how they are related.
»    Where the tuning parts are located in the carburetor body, what they do, and how to remove them.
»    2-stroke vs. 4-stroke needle jets.
»    Primary vs. bleed type needle jets.
»    Which jet types are correct for each model, and how to recognize them.
»    What the markings and sizes of components mean.
»    How the individual circuits work, and affect each other.
»    Planning and re-location of new intake ports.
»    Dual carburetor selection, installation and tuning.
»    How to adjust for open exhaust or megaphones.
»    Mixture adjustment for big cams.
»    Velocity stacks: how they work, and how to select them.
»    Air filter sizing and selection.
»    Increased airflow with the “U.F.O.” and similar devices.
»    Dynamometer testing: how to prepare.
»    Analyzing needle tapers.

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IBRARY is the original source of side-valve performance (since 1971). Click here for a brief bio on the author: . This information is not reprinted from other articles, magazines, or factory literature and is not available anywhere else, and not included in any of my other books; click here for other related titles: .
    I’ve also written booklets on Mikunis for British twins: , Amal Concentric carburetors: , Amal Monobloc carburetors: , and Linkert Model “M” brass carburetors, used on all older Harley-Davidson & Indian models: .