"Harley-Davidson" name & logo for reference purposes only. Not affiliated with Harley-Davidson Motor Co.
“The Linkert Book”
by Jeffrey Diamond
This is the complete
IBRARY booklet on the Linkert (L&L) Model “M” brass 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; plus Indian Chief 74” & 80”, Scout 45”, Junior Scout 30.50”, Motoplane, 841
& 741 Military, and Four Cylinder (sorry, not Sportster).
If you own (or plan to own) one of these great classics, they all came factory-equipped with a Linkert carburetor! For restoration or performance, you should learn all you can about the Linkert carburetor, and how to get the best results from yours. This is not a repair manual, but begins where they leave off, and 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 this useful to identify what parts you need, detect wear and damage, mis-matched parts, etc.
IBRARY is the original source of side-valve performance (since 1971). This information is not reprinted from other articles, magazines, or factory literature and is not available anywhere else. This booklet is stapled in paperback to minimize printing costs, and includes all the following subjects in 58 pages (over 42,000 words), with over 30 black & white illustrations & diagrams, plus 35 data tables:
How the Linkert Works; an in-depth examination of how the different circuits operate, exactly what each
component does, how to interchange parts and make adjustments. This is the only place you’ll see this
information (much more detail than the factory service bulletins).
Linkert Speed Tuning; any Linkert carburetor can be adapted to another motor, or fine-tuned for better
performance with these simple modifications and adjustments. This chapter explains how to make high-performance modifications, adapt the larger 4-bolt 1½” model to the 45 or U-Series, improve throttle
response, make adjustments for hot cams, more air-flow, includes formulas, list of tools & supplies,
worksheet for you to record your progress. No complex machining is required.
Linkert Carb ID; gives the body casting size, serial number, throttle disc (butterfly) & venturi size, and
application for more than 50 models (including knucklehead, panhead, 45, UL, K & KH Models, Indian, etc.).
Linkert Carburetor Selection; can’t find the original
carburetor for your motor, or don’t want to use it?
explores possible alternate choices, depending on your motor type, size, intake manifold, cam timing, etc.
Linkert MR-5; can’t find (or afford) a big factory
racing Linkert for your hot 45? Here’s how to make an
“MR” replica for your WR or racing WL from the more easily available M-74B.
Dual intake manifold fabrication; how to convert your engine to dual carburetors, size
selection, what parts are
needed for your current carburetor, how to make your own
individual manifolds from common materials.
Tuned length intake manifolds; how to make calculations for more power, including 5 Tables of pre-set
manifold lengths based on cam duration, RPM, etc.
Tunnel-ram intake manifold; more power for single-carburetor racers with theory, calculations and dimensions,
including illustrations and Tables of pre-set data.
Tuned “Helmholtz” resonator; add an air box for power, discusses theory, calculation and dimensions,
including Tables of pre-set data.
New intake port fabrication; how to convert your side-valve cylinders or OHV 1936-47 knucklehead or
1948-65 panhead heads to dual port, alignment, size, &c. with illustrations.
Dual 1½” Linkerts; setting up a big twin dual-carburetor installation, using the common M-74B.
Dual 1¼” Linkerts; setting up a 45 dual-carburetor installation, using the common M-51 or M344.
Indian Chief & Scout owners: make your own “Altoona” motor!
Linkert MR-8; making a high-flowing, adjustable “MR” replica for your knucklehead or panhead OHV stroker
from an M-74B for maximum performance with old-time appearance.
Linkert MR-9; making a high-flowing, adjustable 1¼” carburetor for your pre-1940 H-D racer or Indian Chief
or Scout from the common M-51 or M344, etc. for maximum legal performance where later & larger
carburetors are not permitted.
Linkert Air Cleaner; how to modify & improve the standard “bell” air cleaner for more air flow, while retaining
Velocity stacks and ram tubes; how they work, which ones are best.
Beck Replacement Carburetors; decoding the numbers.
Converting the Linkert to Alcohol; methanol, ethanol, etc. effects on jetting, ratios, safety, etc.
Please note: this is not a coffee table book, it is intended to be a research tool for those who seriously want to improve their Linkert carburetors. It is not a repair manual. If your bike won’t start, float bowl leaks, spark plugs foul, &c. my booklet will not help you. It does not contain information on tune-ups, or explain how to remove, disassemble, clean or restore the carburetor. If you do not already have this information do not buy this booklet. If your engine is stock and you’re pleased with how it runs now, this booklet is not going to be of much use, although you might find it interesting.
This same identical booklet is also offered under a different title as eBay item number 200907619632: “Linkert Book: Indian Chief 74 & 80, Scout, 741”.
Do you own, or plan to own, a Harley-Davidson 1937-52 45” or 1937-48 80” flathead? Buy my “45 Performance” or “80 Performance” booklet together with the “Linkert Book”, and save money.
Click here to buy “45 Performance” plus the “Linkert Book”: .
Click here to buy “80 Performance” plus the “Linkert Book”: .
Price: $19.95 + shipping charges as shown. Payment & shipping instructions: please read carefully! No hidden handling charges. I'll ship anywhere. Two forms of shipment are available: a strong tear-proof Tyvek envelope (least expensive), or a corrugated cardboard box (strongest). Find your shipping address below, select a shipping method, and pay the amount shown.
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