; for all 1937-73 Harley-Davidson 45 & UL flathead engines. All 1954-73 KR, KHR, XLR, and early XR factory racing engines had very different breather systems than their flathead ancestors. Learn how they work, and how your factory parts can be modified to increase performance (sorry, the OHV big twins utilize the same basic system, but the parts are completely different, and no advice is offered for knucklehead, panhead, or shovelhead).

; is my complete booklet on the Linkert (L&L) bronze Model “M” carburetor, as used on all Harley-Davidson motorcycles 1933-56 (and some until 1964). This includes: Knucklehead 61” & 74” 1936-47; Panhead 61” & 74” 1948-64; VL Flathead 74” & 80” 1930-36; 45” Flathead solo, military & Servi-Car 1933-58; K, KH & KR Models 1952-65; U-Series Flathead 74” & 80” 1937-48 (sorry, not Sportsters).
    Although I’ve written this primarily for H-D models, the information is generally applicable to Indian Chief 74” & 80”, Scout 45”, Junior Scout 30.50”, Motoplane, 841 & 741 Military, and Four Cylinder. Click the cover picture for complete details.

; is the complete edition of 45 power & speed booklets, subject titles including strokers, relieving, porting, factory hot parts, big valves, motor data, bore & stroke chart, sprocket ratio chart, transmission ratio charts, racing specs, service tips, more. Your “obsolete” 45” side-valve is capable of surprising speed & power, without loss of original appearance or reliability. Over 30 years of research and experience has gone into this booklet. It’s the original, best, and most complete do-it-yourself literature you can buy to get the most from your Harley-Davidson 45. Before making any decisions about modifying (or even rebuilding) your motor, get the best help available, and do it right the first time.

    This book is not a repair manual, but goes far beyond into fine tuning, improvements and modernization. Use it with your service manual for best results. Not an expert mechanic? You’ll still find many improvements you can make yourself with common hand tools. Click the cover picture for complete details.

Buy both at once and save money. Click a cover picture for complete details.

; is the complete edition of 1937-48 U-Series power & speed booklets, subject titles including strokers, relieving, porting, factory hot parts, motor data, racing specs, more. Your “obsolete” 80” side-valve is capable of surprising speed & power, without loss of original appearance or reliability. Over 30 years of research and experience has gone into this booklet. It’s the best do-it-yourself literature you can buy to get the most from your Harley-Davidson UL. Before making any decisions about modifying (or even rebuilding) your motor, get the most help available, and do it right the first time. This booklet is not a repair manual, but goes far beyond into fine tuning, improvements and modernization.

    Use it with your service manual for best results. Not an expert mechanic? You’ll still find many improvements you can make yourself with common hand tools. Click the cover for details.

Buy both at once and save money. Click a cover picture for complete details.

(and Indian Twins); for the 30-44mm Mikuni round-slide “VM” type carburetor. Want more performance from your Harley-Davidson Knucklehead, Panhead, 45, etc.? 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”? Looking for an affordable alternative to replacing or rebuilding your tired Linkert? If you’ve considered using a Mikuni, you should read this. Click the cover picture for complete details.

; my comments, hints & shortcuts to installing an early non-unit British 4-spd. box from a Triumph, BSA, Norton, Royal Enfield, etc. in your 45 solo for hand-clutch & foot shift operation, better acceleration. Compares all four of the the stock and close-ratio H-D factory 45 transmissions 1934-73, with calculations. Also explores some possible complex mods including a medium-close 3-speed without using any factory WR parts, and constructing a 3-speed + overdrive transmission from the common 1941-* 3-speed. Click the cover picture for complete details.

my comments on installing 900cc 1957-71 iron Sportster cylinders & heads on 45 lower end for killer performance and appearance, very compex, requires heli-arc welding, machining and frame modifications. Includes dimensions, list of required parts, illustrations and diagrams. Click the cover picture for complete details.

Carburetors and Intake Systems for British Motorcycles; want more performance from your 1955-68 AJS, BSA, Matchless, Norton, Royal Enfield, Triumph, or Velocette single or twin with Amal Monoblocs? Already have 375, 376, 389, or 689 carburetors, but don’t know how to adjust them? Doesn’t run “right”, and won’t respond to the changes you’ve made? Can’t make any sense of the xeroxed generic 50 year old “instructions”? This booklet will help you. Click the cover for more details.

Carburetors and Intake Systems for British Motorcycles; want more performance from your 1967-* BSA, Triumph, Norton or Royal Enfield single, twin or triple with Concentrics? Already have 626, 928, 930, &c. carburetors, but don’t know how to adjust them? Doesn’t run “right”, and won’t respond to the changes you’ve made? Can’t make any sense of the xeroxed generic 40 year old “instructions”? This booklet will help you; click the cover picture for complete details.

“Super-Tuning Amal Concentric Carburetors” + “Super-Tuning Amal Monobloc Carburetors”

and Intake Systems for British Motorcycles: buy both at once and save money. Click either cover picture for complete details.

Carburetor and Intake Systems for British Motorcycles; for the round-slide carburetors. Want more performance from your older Triumph, BSA, Norton, Royal Enfield or Matchless? Already have Mikuni VM carburetors, but don’t know how to adjust them? Doesn’t run “right”, and won’t respond to the changes you’ve made? Can’t make any sense of the original Japanese “instructions”? Looking for an affordable alternative to replacing or rebuilding your tired Amal Monoblocs or Concentrics? This product will help you. Click the cover picture for complete details.

“Amal GP”

Carburetor Tuning; want more performance from your B.S.A., Triumph, Norton, Royal Enfield, or Velocette with a GP carburetor? Already have a GP carburetor, but don’t know how to adjust it? Doesn’t run “right”, and won’t respond to the changes you’ve made? This product is a collection of all 13 GP original Amal factory documents, reproduced in .PDF format, which will help you. Click the cover for a larger picture on a separate page. Click the button below to purchase these files by PayPal for $9.95:

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    This is not an actual, physical carburetor booklet, but 13 .PDF files which you can read and print from any computer or lap-top using “Acrobat Reader”.

“Amal GP2”

Carburetor Tuning; want more performance from your B.S.A., Triumph, Norton, Royal Enfield, or Velocette with a GP2 carburetor? Already have a GP2 carburetor, but don’t know how to adjust it? Doesn’t run “right”, and won’t respond to the changes you’ve made? This product is a collection of all 9 GP2 original Amal factory documents, reproduced in .PDF format, which will help you. Click the cover for a larger picture on a separate page. Click the button below to purchase these files by PayPal for $9.95:

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    This is not an actual, physical booklet, but 9 .PDF files which you can read and print from any computer or lap-top using “Acrobat Reader”.

“Amal Spitfire GP2”

Carburetor Tuning; want more performance from your B.S.A. Spitfire equipped with the GP2 carburetor? Already have a Spitfire carburetor, but don’t know how to adjust it? Doesn’t run “right”, and won’t respond to the changes you’ve made? This product is a collection of all 10 original BSA factory documents, reproduced in .PDF format, which will help you. Click the cover for a larger picture on a separate page. Click the button below to purchase these 10 files by PayPal for $9.95:

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    This is not an actual, physical booklet, but 10 .PDF files which you can read from any computer or lap-top using “Acrobat Reader”.

“Amal TT”

Carburetor Tuning; want more performance from your BSA, Triumph, Norton or Royal Enfield with a high performance TT carburetor? The TT carburetor is the descendant of the “RN” (= “remote needle”) model carburetor, and the ancestor of the famous “GP” model carburetor. Already have a TT carburetor, but don’t know how to adjust it? Doesn’t run “right”, and won’t respond to the changes you’ve made? This product is a collection of 9 original Amal factory documents, reproduced in .PDF format, which will help you. Click the cover for a larger picture on a separate page. Click the button below to purchase these files by PayPal for $9.95:

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    This is not an actual, physical booklet, but 7 .PDF files which you can read from any computer or lap-top using “Acrobat Reader”.

“Amal Standard”

Carburetor Tuning; want more performance from your B.S.A., Triumph, Norton or Royal Enfield with a pre-Monobloc “Standard” (4/74/274, 5/75/275, 6/76/276, 29/89/289 &c.) carburetor? Already have a Standard carburetor, but don’t know how to adjust it? Doesn’t run “right”, and won’t respond to the changes you’ve made? This product is a collection of the original Amal factory documents, reproduced in .PDF format, which will help you. Click the cover for a larger picture on a separate page. Click the button below to purchase this combined file by PayPal for $9.95:

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    This is not an actual, physical booklet, but 7 .PDF files which you can read from any computer or lap-top using “Acrobat Reader”.