Kit PART #0925-0010 includes three 7.48 mm OD shims in each size from 1.20 mm to 3.50 mm in 0.05 mm increments. Refills sold to dealer in 5 pk.; sold ea. to consumer.

Designed to out-perform and outlast factory valve springs. These kits are progressively wound using Kobe super-clean, chrome silicon-based wire that is heat-treated and shot-peened. They feature tight-tolerance retainers and hardened steel base washers to control lateral movement. Kits use OEM-style valve keys (sold separately). Made in the U.S.A.

High-performance valvetrain components designed to last longer than OEM. White Diamond® valves are one-piece forgings with hard chrome stems. Inconel® 751 exhaust valves are for extreme applications. Valve guides are made of C630 nickel-aluminum bronze. Sold individually. Made in the U.S.A.

All valve seals are made of 100% solid Viton® for long life. Sold individually. Made in the U.S.A. All valve seals are made of 100% solid Viton® for long life. Sold individually. Made in the U.S.A.

Kit includes: black powdercoated cylinder, 54 mm forged piston, ring, pin, and gasket kit. Compression ratio of 11.38 to 1. Designed for use with optional Performance Camshaft kit, PART #0925-1511. Kit includes: black powdercoated cylinder, 54 mm forged piston, ring, pin, and gasket kit. Compression ratio of 11.38 to 1. Designed for use with...

Performance engine upgrade components including a 170cc Big Bore kit for Honda Grom and Monkey. The kit includes a ceramic coated cylinder, 61 mm forged piston, rings, pin, gasket kit and banjo bolts with a compression ratio of 11.5 to 1. An optional camshaft kit can be used with a stock engine but delivers improved results with Big Bore kits.

An ideal engine part to complete KOSO's Big Bore kit. The unique four-valve design increases air flow and performance to provide more power and torque. Features a forged piston, stainless steel 24 mm intake valves, and 20 mm exhaust valves.

Long lasting OEM replacement cam chain tensioners. Arm made of 6061 aluminum, wheel made of structured steel. Compatible with stock engine configuration but recommended for use with KOSO Big Bore/4V kits (sold separately).

240° performance camshaft offers the best results at high rpm. Formulated to increase output with a stock engine but offers best results when combined with 170cc big bore kits. Longer expected durability vs. stock parts. Duration at 1 mm In: 260, Ex: 265. Valve lift In: 8.5 mm, Ex: 8.5 mm. Running clearance In: 0.10 mm, Ex: 0.17 mm. 240°...

Provide a great finishing touch to your bike with these camshaft end covers. Smooth chrome finish. Includes all mounting hardware. Sold in pairs. Provide a great finishing touch to your bike with these camshaft end covers. Smooth chrome finish. Includes all mounting hardware. Sold in pairs.