CILOYU mini bike jackshaft kit for CT200U — 17mm shaft, 10T & 20T 420 sprockets with sealed 6203RS bearings

CILOYU's mini bike jackshaft shaft kit is a complete replacement assembly that supplies a hardened 17 mm jackshaft, 420-chain sprockets (10T and 20T), and sealed 6203RS bearings for smoother, longer-lasting chain drive on CT200U-style minibikes.

If your Coleman CT200U or a compatible mini bike is showing chain slop, noisy transmission, or rapid sprocket wear, this kit gives you the core hardware to rebuild the jackshaft quickly and reliably. Built from premium steel components and supplied with sealed bearings and all mounting hardware, the assembly is designed to restore correct chain alignment and reduce drivetrain wear without the need to source several separate parts.

Will this jackshaft kit fit my CT200U or similar minibike?

The kit is engineered for Coleman CT200U models and many popular clones and variants. Check the jackshaft diameter and thread size on your bike before ordering—this kit uses a 17 mm shaft and matching sprockets, not a 5/8" (15.87 mm) sprocket.

• Direct fit: Coleman CT200U, CT200U-EX, CT200U-EXR
• Compatible models: BT200X (all), RB200, Baja MB200, MB165, Axis M200
• Also fits: Realtree RT200 and Massimo MB200-style frames
• Important: uses 17 mm jackshaft diameter; not compatible with 5/8" sprockets

How does this kit improve drivetrain performance?

Replacing worn sprockets and bearings stops chain stretch from causing slippage and reduces vibration that accelerates wear. The sealed 6203RS bearings keep contaminants out, maintaining smoother rotation under load and extending component life.

• Includes sealed 6203RS bearings for dust and moisture resistance
• Two sprockets (10T and 20T) let you tune gear engagement or replace worn teeth
• Premium steel shaft and sprockets resist deformation and wear
• Spacer, keyway and nut included for proper alignment and secure mounting

What parts are included and what should I prepare for installation?

The package contains the jackshaft assembly and all essential small parts so you won’t need to hunt for specialty hardware. Have basic hand tools ready plus thread locker if you prefer a secure fastening method.

• 1 x jackshaft sprocket shaft (17 mm diameter)
• 2 x sealed 6203RS bearings, 1 x spacer, 1 x keyway, 1 x nut
• 1 x 420 chain jackshaft sprocket 10T and 1 x 420 chain jackshaft sprocket 20T
• Recommended tools: sockets/wrenches, bearing press or puller, torque wrench, thread locker

Who is this for: Riders, mechanics, and hobbyists who own a CT200U or a similar small-displacement minibike and want a reliable, value-packed jackshaft replacement. It’s ideal for people restoring older bikes, correcting chain alignment, or swapping sprockets for different final drive ratios. If your bike requires a 17 mm jackshaft and 420 chain components, this CILOYU kit supplies the essential parts to get the drivetrain back to dependable operation.