Rebuild your GY6 engine with confidence using this Complete Engine Bolt Kit. This 38-piece hardware assortment includes nearly every common metric bolt needed to assemble or restore most GY6 125cc, 150cc, and 169cc engines. Whether you're installing a big bore kit, replacing a crankshaft, rebuilding the top end, or refreshing a tired engine, this kit eliminates the hassle of hunting down individual bolts.

Perfect for replacing stripped, rusted, rounded, or missing hardware while giving your engine a clean, professional finish.

Features

• Complete 38-piece GY6 engine bolt assortment
• Includes the most common M6 engine bolts used during rebuilds
• Ideal for complete engine rebuilds and restorations
• Great for big bore kit, cylinder head, crankcase, and transmission service
• Replaces damaged, worn, or missing factory hardware
• Saves time by eliminating trips to the hardware store
• Designed for stock and performance engine builds

Kit Includes

• M6 x 12mm (2)
• M6 x 16mm (2)
• M6 x 18mm (4)
• M6 x 20mm (2)
• M6 x 22mm (2)
• M6 x 25mm (9)
• M6 x 28mm (3)
• M6 x 35mm (4)
• M6 x 40mm (1)
• M6 x 50mm (1)
• M6 x 95mm (5)
• M6 x 100mm (1)
• M6 x 110mm (1)

Total Bolts: 38 Pieces

Compatible Engines

Fits most 157QMJ-based GY6 engines, including:

• 157QMJ
• 161QMK
• 152QMI
• 1P61QMK
• YN1P57QMJ
• 1P52FMI
• 154FMI
• JJ157QMJ
• 1P57QMJ
• BN157QMJ
• BN161QMK-A
• Other compatible QMJ, QMK, and QMI engine variants

Commonly found on many Chinese scooters, ATVs, go-karts, buggies, and mopeds equipped with 125cc, 150cc, and 169cc GY6 engines.

Perfect For

• Complete engine rebuilds
• Engine restorations
• Big bore kit installations
• Cylinder head replacement
• Crankshaft replacement
• Crankcase assembly
• CVT and transmission service
• General engine maintenance

Why Replace Engine Hardware?

Old engine bolts can become:

• Stripped
• Rounded
• Rusted
• Corroded
• Cross-threaded
• Damaged from repeated servicing

Replacing worn hardware helps ensure proper torque, improves reliability, and gives your engine a clean, factory-quality appearance.

Important Fitment Note

This kit is designed for 157QMJ-based 125cc, 150cc, and 169cc GY6 engines. Some manufacturers may use different bolt lengths depending on the engine version or model year.

Always compare your original hardware before installation to ensure proper fitment.