Moturo Piston Kit 40 mm for 47-49 cc Pocket Bike Dirt Bike

Moturo 40 mm Piston Kit for 47-49cc Pocket Bike, Dirt Bike, Mini Quad

The Moturo 40 mm Piston Kit for 47-49cc Pocket Bikes, Dirt Bikes, and Mini Quads — a top-end wear part that is replaced during bike servicing. 40 mm piston diameter, ready for installation.

The piston sits in the cylinder and converts combustion pressure into rotational motion. 40 mm diameter, identical in construction to the original piston for 47-49cc two-strokes in pocket bikes, dirt bikes, and mini quads. A one-to-one replacement, all port timing and contact surfaces meet factory specifications.

The scope of delivery includes the piston, two piston rings, piston pin, and two circlips — everything that goes into the cylinder during a top-end service.

Replacement takes about an hour using a socket wrench set, cylinder puller, and piston ring compressor.

Piston kit for your bike, made by Moturo.

Performance · Material · Specs

• 40 mm piston diameter, identical to the original piston
• For 47-49cc two-strokes in pocket bikes, dirt bikes, and mini quads
• Port timing and contact surfaces match factory specifications
• Scope of delivery: piston, two piston rings, piston pin, two circlips

Important Notes – please read

Component for race and off-road use. No ABE/StVZO approval. Not for public road use. Before ordering, verify the diameter of your old piston with a caliper; if the measurement differs, the piston will not fit the cylinder.

Tools & Time Required

• Socket wrench set for cylinder head and cylinder
• Cylinder puller
• Piston ring compressor
• Needle-nose pliers for the circlips
• About one hour for an experienced mechanic

Scope of delivery

1 × piston 40 mm, 2 × piston ring, 1 × piston pin, 2 × circlips for the piston pin. Not included: cylinder head gasket, cylinder base gasket, tools.

Frequently Asked Questions

Does this piston fit a four-stroke engine?
No, the piston is designed exclusively for two-strokes.

How do I check if 40 mm is the correct size?
Measure the old piston at the skirt area with a caliper; the measurement must be 40 mm, otherwise the piston will not fit the cylinder.

Are the piston rings pre-installed?
No. The piston rings are supplied separately and are fitted onto the piston during installation.