GY6 125cc/150cc 10x16mm Cylinder Base Dowel Pins

10x16mm Cylinder Base Dowel Pins for GY6 125cc and 150cc Engines

These dowel pins keep the cylinder and crankcase lined up correctly on a GY6 engine. They are sized for 125cc and 150cc setups and play a role in holding compression and avoiding gasket leaks. You can find them among the GY6 150cc scooter parts, where they provide a snug fit during reassembly.

Build and Purpose

These pins are made from hollow steel, which keeps them light while still offering solid strength for engine work. They use OEM specifications that match factory dimensions, so they seat properly and help reduce the chance of a gasket blowout. Sound construction like this supports steady engine performance.

When to Swap Out Your Dowel Pins

Replacing these pins is a good idea during a cylinder swap or a full engine rebuild. Pins that are worn or damaged can allow the cylinder to shift out of line, which may lead to serious engine problems. Keeping them in good shape matters for the engine to run as it should.

Specifications

• Material: Hollow Steel
• Size: 10mm Outer Diameter, 16mm Length
• Quantity: 2 pins
• Fits: GY6 150cc (157QMJ) 4-stroke engines, including 157QMJ, 161QMK, 152QMI, 1P61QMK and other QMJ/QMK/QMI variants

Fitment

Fits:

• GY6 150cc (157QMJ) engines (engine codes 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A)
• Other GY6 125cc/150cc QMJ, QMK and QMI engine variants

How to choose: Compare the engine code stamped on your motor with the codes above. The pins measure 10mm across the outside and 16mm long, and they come as a pair.

Where it goes: part #4 on the cylinder diagram for the GY6 150cc (157QMJ).

Shop more: GY6 150cc Scooter Parts (157QMJ) · GY6 Scooter Parts · Scooter Big Bore & Cylinder Kits · Scooter Bolts, Screws & Hardware · Scooter Parts