Scooter Variator Control Shims - 20mm Boss, 30-Piece

Scooter Variator Control Shims for 20mm Boss Variators

This shim kit is made to fine-tune the belt travel of a scooter variator. It suits 20mm variator components in particular, where mismatched parts or aftermarket setups often cause trouble. You can also browse our scooter variators & roller weights range. Correct shimming helps the variator open fully, which can make a real difference to how your scooter runs. The kit contains 30 precision steel shims across three thicknesses for accurate tuning.

Precision Adjustments

The steel shims fit between the drive faces of the variator, which lengthens the variator boss. That extra length gives the belt its full travel, something that matters when the variator does not open all the way. Every kit includes 10 shims each of 0.1mm, 0.2mm, and 0.5mm, so you can build up the exact stack your setup needs.

Compatibility and Use

Designed for 20mm variator components, this kit works with a range of stock and aftermarket variators on many 50cc platforms. It is intended for off-road use only and should not be fitted to scooters used on public roads, so it suits riders focused on off-road builds.

Specifications

• Material: Steel
• Shim Thicknesses: 0.1mm, 0.2mm, 0.5mm
• Quantity: 30 pieces (10 of each thickness)
• Boss Diameter: 20mm
• Fits: Generic 50cc scooters with a 20mm variator boss, including QMB139 (GY50) and selected Honda, Kymco

Fitment

Fits:

• Generic / Chinese 50cc (QMB139, GY50, 49cc; stock and aftermarket variators with 20mm boss)
• Honda Ruckus (NPS50), Metropolitan, Elite SA50, Elite SR50 (2-stroke Elite SA/SR; stock variator)
• Kymco ZX50, Super 8, Super 9 (stock variator with 20mm boss)
• SYM DD50 (stock variator with 20mm boss)

How to choose: Check the variator boss diameter before ordering. This kit is only for 20mm bosses.

Shop more: Scooter Variators & Roller Weights · Scooter Parts