GY6 Cam Chain Tensioner Assembly - 125cc / 150cc

GY6 Cam Chain Tensioner Assembly for 125cc and 150cc Engines

This self-adjusting cam chain tensioner assembly is made for GY6 125cc and 150cc four-stroke engines. It keeps chain tension steady across a range of engine speeds, which supports consistent engine performance. It is one of the GY6 scooter parts worth considering if you want to improve how dependably your engine runs. It suits anyone maintaining a scooter, ATV, or go-kart that needs to run smoothly.

Construction and Design

The housing is die-cast aluminum and includes a steel plunger along with a retaining clip. A recessed Phillips screw with an internal spring mechanism handles adjustment, so setting and servicing the unit is simple. The assembly is engineered to hold up under the varied conditions an engine encounters.

Installation and Adjustment

It attaches with a two-bolt trapezoidal flange, which keeps mounting uncomplicated. Tension should be checked and adjusted from time to time, especially after heavy use or changes to the engine, to make sure it stays correct. Replace this part if you hear unusual engine noise or notice performance problems linked to the cam chain.

Specifications

• Type: Automatic cam chain tensioner/lifter assembly
• Material: Die-cast aluminum housing with steel plunger
• Adjustment: Recessed Phillips screw with internal spring mechanism
• Dimensions: 2.5" L x 2" W x 1.5" H
• Fits: GY6 150cc (157QMJ) 4-stroke engines, and other GY6 125cc and 150cc engines with 152QMI and 157QMJ codes

Fitment

Fits:

• GY6 150cc (157QMJ)
• GY6 125cc and 150cc 4-stroke engines with 152QMI and 157QMJ codes (all QMI/QMJ variants)
• Chinese scooters, ATVs and go-karts with GY6-based engines, including Wolf, Ice Bear, TaoTao and Bintelli

How to choose: Check your engine code, either 152QMI or 157QMJ, which is stamped on the engine case, then select the part listed for your displacement.

Where it goes: Refer to part #3 on the cam chain and tensioner diagram for the GY6 150cc (157QMJ).

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