Introduction
Nothing ruins a trail ride faster than a throttle that refuses to snap back. Most riders run into this at some point: dirt, rain, and normal wear cause the throttle cable or housing to stick. Over time, these components can become worn, sticky, or damaged — making the bike difficult or even unsafe to operate.
This guide shows you how to replace the entire throttle assembly on a Coleman CT200U‑AB minibike so you can get back to reliable, responsive riding in under an hour.
Key Terminology
- Throttle housing – A two‑piece plastic shell that holds the grip and cable end on the handlebar.
- Ferrule – The metal collar crimped to the throttle‑cable sheath.
- Carburetor linkage – The lever on the carb accepting the inner cable.
- Free play – Small rotational slack at the grip (1–2 mm) before the cable pulls.
Hot engines and moving parts can cause serious injury.
‑ Let the engine cool completely.
‑ Remove the spark‑plug boot before you start.
‑ Wear safety glasses and gloves at all times.
What you need
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Switch the fuel valve OFF, and place the bike on a level surface before starting.
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Remove the seat for better access.
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There are two 8mm bolts holding the seat down to the frame (Picture 2).
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Use the 8mm wrench to remove the bolts, then lift the seat to remove it.
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Inspect the throttle assembly. Check for visible damage to the throttle cable, grip, and housing. Look for frayed cables or sticking in the throttle twist mechanism.
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This throttle cable is visibly frayed and must be replaced (Picture 2).
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Remove the screw in Picture 1 with the Phillips #00 screwdriver.
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Slide off the rubber grip.
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Take off the throttle clamp to expose the throttle cable sheath.
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Remove the nut and screw securing the throttle cable to the carburetor linkage (Picture 1).
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Pull the cable out of the throttle assembly (Picture 2).
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Lay out the new throttle kit in front of you. Make sure that you have a throttle cable, clamp, and grip.
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Use the screwdriver to separate the two halves of the throttle clamp (Picture 2 & 3).
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Install the new wire into the new throttle.
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Insert the ferrule into the throttle clamp.
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Insert the ferrule into the throttle housing (Picture 1).
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Hook the barrel into the grip drum (Picture 2).
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Check that the cable rides in the molded channel (Picture 3).
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Prepare the grip and the throttle for installation on the handlebars (Picture 1).
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Apply a drop of thread‑locker to each bolt. Clamp the two housing halves together (Picture 2).
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Slide the grip onto the handlebar (Picture 3).
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Secure the throttle assembly onto the handlebars.
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Reinstall the screws and tighten them with a screwdriver (Picture 2).
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Attach the cable sleeve to the throttle assembly on the engine.
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Place the throttle cable into the throttle assembly located on the engine (Picture 2).
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Tighten the screws to secure the throttle cable.
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Adjust the throttle tension. Ensure that the throttle snaps back properly when released.
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Adjust the cable tension if necessary using the adjustment screw near the carburetor. Refer back to Step 11 if needed (Pictures 2 & 3).
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Reattach the spark plug wire to the spark plug (Picture 1).
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Reinstall the seat and tighten the bolts (Picture 2).
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Twist the throttle to make sure it works properly.
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The throttle replacement is complete. The throttle should move smoothly and snap back when released.
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York University, Team 4-8, Woodhouse Winter 2025 Member of York University, Team 4-8, Woodhouse Winter 2025
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