Cylinder Head Bolt Pair - M6x100 for Scooters & Mopeds
ITEM# TT-26904
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Description
Cylinder Head Bolt Pair for 125cc and 150cc Scooters
Two M6x100 bolts make up this set, used to fasten the cylinder head to the engine case on 125cc and 150cc GY6 engines. They help keep the engine assembly sound. Secure fastening supports steady engine running and a longer service life. Like other cylinder head and valve components for scooters, these bolts can wear out or get damaged and need swapping over time.
Build and Fit Details
The bolts have an M6x1.00 thread and an overall length of 106mm. They are shaped to seat the cylinder head firmly, which lowers the chance of them working loose while the engine runs. They suit GY6-type engines across several engine codes.
Signs It Is Time for New Head Bolts
Consider replacing cylinder head bolts when they show wear, or whenever the cylinder head has been taken off for service. Sound fastening matters for engine performance, and fitting fresh bolts can help avoid leaks and keep the assembly tight.
Specifications
- Set: 2 bolts
- Thread Size: M6x1.00
- Thread Length: 25mm
- Shaft Length: 100mm
- Overall Length: 106mm
- Fits: GY6 125/150cc (157QMJ-based) engines, cylinder head to case
Fitment
Fits:
- GY6 150cc (157QMJ) (cylinder head to case; engine codes 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A; other QMJ, QMK and QMI engines)
How to choose: Compare the engine code stamped on your engine case with the codes above. Any code that includes QM or FM is covered.
Where it goes: part #13 on the cylinder head diagram for the GY6 150cc (157QMJ).
Shop more: Scooter Cylinder Heads & Valves · Scooter Bolts, Screws & Hardware · Scooter Parts
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