MOTO-MASTER Nitro Front Sprocket for HUSQVARNA TC 85, KTM SX 85 and GAS GAS MC 85 2018-2027

On KTM SX 85, HUSQVARNA TC 85 and GAS GAS MC 85 from 2018 to 2027, the MOTO-MASTER Nitro front sprocket fits in place of the original part. Mounted on the gearbox output shaft (countershaft), the front sprocket passes the engine's torque on to the chain. Every tooth is loaded on every turn of the wheel: a worn front sprocket makes the chain jump and speeds up wear on the whole drivetrain.

Specifications

• Brand: MOTO-MASTER
• Manufacturer part numbers: 610511213, 610511214
• Chain pitch: 428
• Material: steel
• Available versions: 13 Teeth: ref. 610511213; 14 Teeth: ref. 610511214
• Weight: 160 g
• Engine: 2-stroke

Choosing the right number of teeth

Start from the stock number of teeth. One tooth less on the front sprocket shortens the gearing (more acceleration, ideal on tight terrain); one tooth more lengthens it (more speed on fast tracks). One tooth on the front sprocket is worth roughly three to four teeth on the rear sprocket.

When to replace it?

• Teeth thinned, pointed or hooked.
• Chain that jumps or slaps under acceleration.
• Play between the sprocket and the shaft, or marked splines.

Check it every time you service the chain and replace it along with the rear sprocket and the chain. Many riders change the front sprocket with every new chain, because it wears much faster than the rear sprocket.

Fitting tips

1. Loosen the sprocket nut or bolt while holding the rear wheel with the brake, before slackening the chain.
2. Clean the countershaft and check the oil seal behind the sprocket.
3. Fit the sprocket the right way round, with a lock washer or threadlocker as on the original assembly, and tighten to the manufacturer's torque.
4. Set the chain tension and lube it with chain lube.

Why MOTO-MASTER?

Moto-Master is a Dutch brand founded in 1997 by Gaston Vernon that specialises in braking: discs, sintered pads and oversize kits. Its discs are designed in CAD and then laser-cut on CNC machines, with manufacturing in the Netherlands and ISO 9001:2015 certification.

Spare parts and items to plan

• Rear sprocket : MOTO-MASTER · RENTHAL
• Drive chain : AFAM · RENTHAL 428
• Chain lube : LIQUI MOLY 400 ml · SCOTTOILER

Frequently asked questions

Should the rear sprocket be changed too?
If it's worn, yes: a new front sprocket running on a tired rear sprocket and chain is worn out within a few hours.

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
GAS GAS MC 85 2027
GAS GAS MC 85 2026
GAS GAS MC 85 2025
GAS GAS MC 85 2024
GAS GAS MC 85 2023
GAS GAS MC 85 2022
GAS GAS MC 85 2021
HUSQVARNA TC 85 2027
HUSQVARNA TC 85 2026
HUSQVARNA TC 85 2025
HUSQVARNA TC 85 2024
HUSQVARNA TC 85 2023
HUSQVARNA TC 85 2022
HUSQVARNA TC 85 2021
HUSQVARNA TC 85 2020
HUSQVARNA TC 85 2019
HUSQVARNA TC 85 2018
KTM SX 85 2027
KTM SX 85 2026
KTM SX 85 2025
KTM SX 85 2024
KTM SX 85 2023
KTM SX 85 2022
KTM SX 85 2021
KTM SX 85 2020
KTM SX 85 2019
KTM SX 85 2018