Motion Pro Auxiliary Fuel Tank – Shop Tuning Tank for Carb Sync & Diagnostics
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Motion Pro Auxiliary Fuel Tank – Shop Tuning Tank for Carb Sync & Diagnostics
Tune and diagnose with the main tank off the bike. The Motion Pro Auxiliary Fuel Tank supplies steady fuel for carb synchronization and test running in the shop. Includes a screw-on cap with O-ring, 4 ft of 1/4″ fuel line, and an in-line petcock.
Overview
When you need access to the top end or are synch’ing carbs, the stock tank gets in the way. This Motion Pro Auxiliary Fuel Tank replaces the main tank during tuning so you can run the engine safely and consistently while the bike is on the stand.
Features
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Purpose-built shop tank for tuning with the OE tank removed
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Ideal for carb synchronization and diagnostics
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Screw-on cap with O-ring seal to reduce leaks/evaporation
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Includes 4 ft of 1/4″ fuel line for common gravity-feed carbs
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In-line petcock for easy on/off fuel control
Benefits
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Keeps fuel supply stable during syncs and test runs
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Faster access to throttles, cables, and top-end components
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Cleaner, safer alternative to makeshift bottles and hoses
Fitment / Use
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Universal shop tool for carbureted motorcycles using 1/4″ fuel line
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Not a permanent fuel system; do not ride with auxiliary tank installed
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Fuel-injected systems typically require a pressurized pump (not supported)
Specs
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Type: Auxiliary tuning tank
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Line size: 1/4″ (approx. 6.35 mm)
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Includes: In-line petcock, screw-on cap with O-ring
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Finish: Shop-use construction (durable)
In the Box
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Motion Pro Auxiliary Fuel Tank
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4 ft of 1/4″ fuel line
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In-line petcock (installed)
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Screw-on cap with O-ring
How to Use (Quick Guide)
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Secure the aux tank above carb height.
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Connect the 1/4″ line to your carb feed.
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Open the petcock and check for leaks.
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Perform sync/diagnostics per your service manual.
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Close petcock and disconnect when finished.
FAQ's
Can I use this on a fuel-injected bike?
It’s intended for carbureted systems. Most EFI bikes need a pressurized pump, which this tank does not provide.
Is the tank vented?
Yes—the screw-on cap with O-ring seals well; venting is handled as designed for shop use. Keep the tank upright and above carb height.
What size fuel line does it include?
4 feet of 1/4″ fuel line, suitable for common gravity-feed carburetors.
Can I ride with this installed?
No. It’s a shop tool only—do not use on the road.
Does it come with a petcock?
Yes, an in-line petcock is included for fuel control during tuning.
Will it help with carb synchronization?
Yes. That’s its primary purpose—providing a steady fuel supply while the OE tank is off for access during carb syncs
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