Motion Pro builds control cables, specialty tools and service equipment for motorcycles, and is the name most shops reach for when a job needs the correct tool rather than an improvised one. Its cables are built to OE routing specifications.
The Motion Pro Sprocket Jammer is a crucial tool for V-twin owners performing drivetrain maintenance. It effectively prevents unwanted chain and sprocket rotation, making tasks like counter shaft nut removal or rear axle service significantly safer and easier.
Why riders pick this
Prevents chain and sprocket rotation during service
Assists in tightening rear axles against chain blocks
CNC billet aluminum construction for durability
Blue anodized finish with laser etching for visibility
Simplifies counter shaft nut removal and installation
When servicing your V-twin's rear wheel or front sprocket, stability is key. This Motion Pro Sprocket Jammer provides that stability, locking your drivetrain in place so you can apply torque confidently. Crafted from CNC-machined billet aluminum, it's built to withstand the rigors of your workshop.
Precision Engineered for Drivetrain Service
Securely prevents chain and sprocket rotation during maintenance
Can be used to pull the rear wheel against chain blocks for axle tightening
Constructed from high-strength CNC billet aluminum
Features a striking blue anodized finish with laser etching for easy identification
Essential for V-Twin Mechanics
Whether you're swapping sprockets, replacing a chain, or simply performing routine rear wheel maintenance, the Motion Pro Sprocket Jammer is an indispensable tool. Its robust design and clear anodized finish not only ensure long-lasting performance but also make it easy to spot in your toolbox. This tool is compatible with V-twin motorcycles, including Harley-Davidson and Indian Motorcycle models, simplifying complex tasks.
Specifications
Brand: Motion Pro
Manufacturer Part #: 08-0642
Length: 5.98 in
Width: 3.97 in
Height: 0.43 in
Weight: 0.07 lbs
Country of Origin: China (Mainland)
Common questions
What is the primary use of a sprocket jammer?
A sprocket jammer is used to lock the chain and sprockets in place. This prevents the engine or rear wheel from rotating when you need to remove or install the counter shaft nut, or during other drivetrain service.
Can this tool help when tightening the rear axle?
Yes, the Motion Pro Sprocket Jammer can be positioned to pull the rear wheel against the chain blocks, providing leverage and stability when you are torquing the rear axle nut to spec.
Is this compatible with all Harley-Davidson and Indian Motorcycle models?
This tool is designed to fit V-twin motorcycles, including Harley-Davidson and Indian Motorcycle models, that utilize a chain and sprocket drivetrain. It's a universal tool for such applications.
Ordering from Vtwinbikers
Brand new, sourced through authorized US distribution — never used, never grey-market.
Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
BRAND
Motion Pro
TYPE
Tools
SKU
57-8642
WEIGHT
0.07 lb
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
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✓ VERIFIED
Aug 10, 2025
Good looking and functional, but likes getting chewed.
Does exactly what its supposed to, but takes extra care to keep the sprocket from chewing on it.<br /><br />I found it needed to engage with the sprocket teeth first then spun into the chain for the best fit. One pull on the torque wrench later it fell out of the sprocket teeth and got a bit chewed up on the next pull. This was jamming the front sprocket while tightening the shaft nut, so maybe it's better used only with the rear sprocket.<br /><br />No regrets, I'd still buy it again.
✓ VERIFIED
Dec 6, 2024
Works great broke free single sided swing arm nut well over 200inch pounds torque only a slight bend on the one tip of the jammer
Motion Pro Sprocket Jammer Blue A...
$78.000,00
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