1964 Triumph T100 ?Jack Pine Special? Review The 1964 Triumph T100 Jack Pine Special isn?t just a motorcycle?it?s a purpose-built piece of American racing history. Named after the grueling Jack Pine Enduro, one of the oldest and most prestigious off-road motorcycle competitions in the United States, this model represents a time when British bikes dominated American enduro racing through grit, innovation, and light weight. Background & Purpose The Jack Pine Special was a factory-modified version of the Triumph T100C scrambler, tailored specifically for endurance events like the 500-mile Jack Pine Enduro held in Michigan. It was built in extremely limited numbers?often modified either by U.S. dealers or under Triumph?s Eastern U.S. distributor, Johnson Motors (JoMo)?making it an ultra-rare collectible today. This model was a result of Triumph?s strategy to compete with rugged American bikes like Harley-Davidson and Indian, by building a lighter, more agile off-road machine that could survive punishing terrain. Design & Features Engine 499cc air-cooled parallel twin Dual-carb setup (in some versions), high-compression pistons Around 34?36 horsepower Tuned for tractable power and mid-range torque Factory modifications sometimes included stronger bottom ends and special ignition timing The engine was a standout for its time?responsive and relatively lightweight, making it ideal for long-distance trail competition. Chassis & Suspension Lightened frame, often stripped of unnecessary street parts High-mounted exhausts with skid plates Reinforced subframes and sometimes stiffer springs 19-inch front wheel and 18-inch rear for better obstacle handling With its shorter wheelbase and lighter frame than larger American machines, the Jack Pine Special handled woods, sand, and rocky terrain with nimbleness rarely seen in 500cc machines of the time. Instrumentation & Ergonomics Minimalist layout?no tach, sometimes no speedometer Flat, wide bars for better control over rough ground Stiff solo seat or thin dual saddle Large fuel tank (~3.5 gallons) for endurance range Comfort took a back seat to function. Riders were expected to live with the discomfort for 500 miles of woods and ruts?and they did. Performance The Jack Pine Special was light, fast, and agile, designed to be tossed through trees and bombed down sandy two-track. Compared to heavyweight competition, it felt like a featherweight boxer: nimble and quick on its feet. 0?60 mph in under 7 seconds (on road) Top speed of around 90?95 mph, though irrelevant in woods racing Excellent torque curve for low-end grunt in mud and sand Though the drum brakes weren?t stellar, the light weight made them adequate. The biggest asset was handling?where riders could keep speed up in tight trails while heavier bikes bogged down or got stuck. Legacy & Collectibility The Jack Pine Special holds a near-mythical status among Triumph collectors and off-road racing historians. With so few built?and many raced hard and lost to time?surviving examples are exceedingly rare. When they do appear at auction or in vintage shows, they?re snapped up quickly. Its legacy also helped pave the way for later factory enduro bikes and influenced Triumph?s modern scrambler resurgence.
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1964 Triumph T100 ?Jack Pine Special? Review
The 1964 Triumph T100 Jack Pine Special isn?t just a motorcycle?it?s a purpose-built piece of American racing history. Named after the grueling Jack Pine Enduro, one of the oldest and most prestigious off-road motorcycle competitions in the United States, this model represents a time when British bikes dominated American enduro racing through grit, innovation, and light weight.
Background & Purpose
The Jack Pine Special was a factory-modified version of the Triumph T100C scrambler, tailored specifically for endurance events like the 500-mile Jack Pine Enduro held in Michigan. It was built in extremely limited numbers?often modified either by U.S. dealers or under Triumph?s Eastern U.S. distributor, Johnson Motors (JoMo)?making it an ultra-rare collectible today.
This model was a result of Triumph?s strategy to compete with rugged American bikes like Harley-Davidson and Indian, by building a lighter, more agile off-road machine that could survive punishing terrain.
Design & Features
Engine
499cc air-cooled parallel twin
Dual-carb setup (in some versions), high-compression pistons
Around 34?36 horsepower
Tuned for tractable power and mid-range torque
Factory modifications sometimes included stronger bottom ends and special ignition timing
The engine was a standout for its time?responsive and relatively lightweight, making it ideal for long-distance trail competition.
Chassis & Suspension
Lightened frame, often stripped of unnecessary street parts
High-mounted exhausts with skid plates
Reinforced subframes and sometimes stiffer springs
19-inch front wheel and 18-inch rear for better obstacle handling
With its shorter wheelbase and lighter frame than larger American machines, the Jack Pine Special handled woods, sand, and rocky terrain with nimbleness rarely seen in 500cc machines of the time.
Instrumentation & Ergonomics
Minimalist layout?no tach, sometimes no speedometer
Flat, wide bars for better control over rough ground
Stiff solo seat or thin dual saddle
Large fuel tank (~3.5 gallons) for endurance range
Comfort took a back seat to function. Riders were expected to live with the discomfort for 500 miles of woods and ruts?and they did.
Performance
The Jack Pine Special was light, fast, and agile, designed to be tossed through trees and bombed down sandy two-track. Compared to heavyweight competition, it felt like a featherweight boxer: nimble and quick on its feet.
0?60 mph in under 7 seconds (on road)
Top speed of around 90?95 mph, though irrelevant in woods racing
Excellent torque curve for low-end grunt in mud and sand
Though the drum brakes weren?t stellar, the light weight made them adequate. The biggest asset was handling?where riders could keep speed up in tight trails while heavier bikes bogged down or got stuck.
Legacy & Collectibility
The Jack Pine Special holds a near-mythical status among Triumph collectors and off-road racing historians. With so few built?and many raced hard and lost to time?surviving examples are exceedingly rare. When they do appear at auction or in vintage shows, they?re snapped up quickly.
Its legacy also helped pave the way for later factory enduro bikes and influenced Triumph?s modern scrambler resurgence.