PROX Top End Gasket Kit (base + head) 125 version for HUSQVARNA, KTM and GAS GAS 2016-2023

The PROX (embase + culasse) 36.6216 top end gasket kit is designed for KTM EXC 150, SX 125, XCW 125, HUSQVARNA TC 125, TE 150, TX 125 and GAS GAS MC 125 from 2016 to 2023. As soon as the cylinder head or cylinder is removed, their gaskets must be replaced: crushed when tightened, they have taken the shape of the parts and will no longer seal. This kit groups under one part number the gaskets needed to reassemble the top end.

Specifications

• Brand: PROX
• Manufacturer part number: 36.6216
• Weight: 60 g
• Engine: 2-stroke

When to replace it?

• Coolant or oil seeping at the head/cylinder or cylinder/crankcase joint.
• Coolant level dropping, bubbles in the radiator.
• Hissing or black marks where the exhaust leaves the cylinder.

At every piston change and every time the cylinder head or cylinder is removed, even for a simple inspection. Gaskets cost little compared with the work of stripping the engine.

Fitting tips

1. Clean the gasket faces without scratching them (plastic scraper, solvent): they must be clean, dry and free of burrs.
2. Fit the gaskets dry, without sealant, unless the workshop manual says otherwise.
3. Refit a base gasket of the same thickness as the old one, unless you are deliberately adjusting the squish.
4. Tighten the cylinder head in a criss-cross pattern, in several stages, up to the manufacturer's torque.
5. While it's apart, replace the spark plug and refill the coolant.
6. After break-in, check the torque with the engine cold and make sure there are no leaks.

Why PROX?

ProX Racing Parts has been supplying engine and clutch parts to motocross riders since 1975, from its headquarters near Amsterdam. According to its catalogue, most of its parts are made in Japan, by manufacturers that also produce parts for the Japanese motorcycle makers.

Spare parts and items to plan

• Piston : VERTEX 24243A · VERTEX 24419A
• Piston rings : PROX · VERTEX
• Spark plug : NGK 2707 · NGK 3230
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• 2-stroke oil : LIQUI MOLY 1 L · MOTUL 1 L

Frequently asked questions

What does the kit contain?
The base gasket and the head gasket.

Should I replace it along with the piston?
Yes: as soon as the cylinder head and cylinder are off, new gaskets go back on. It's the right time to fit a new piston kit and new rings if the engine has some hours on it.

Compatibility

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

Fits:
GAS GAS MC 125 2023
GAS GAS MC 125 2022
GAS GAS MC 125 2021
HUSQVARNA TC 125 2022
HUSQVARNA TC 125 2021
HUSQVARNA TC 125 2020
HUSQVARNA TC 125 2019
HUSQVARNA TC 125 2018
HUSQVARNA TC 125 2017
HUSQVARNA TC 125 2016
HUSQVARNA TE 150 2023
HUSQVARNA TE 150 2022
HUSQVARNA TE 150 2021
HUSQVARNA TE 150 2020
HUSQVARNA TX 125 2019
HUSQVARNA TX 125 2018
HUSQVARNA TX 125 2017
KTM EXC 150 2023
KTM EXC 150 2022
KTM EXC 150 2021
KTM EXC 150 2020
KTM SX 125 2022
KTM SX 125 2021
KTM SX 125 2020
KTM SX 125 2019
KTM SX 125 2018
KTM SX 125 2017
KTM SX 125 2016
KTM XCW 125 2019
KTM XCW 125 2018
KTM XCW 125 2017