Bottom End

• Endurance and high rpm • Each piston is electra-coated on the dome, ring groove, and pin bore, for maximum wear resistance and protection from micro-welding, galling and detonation • GP Series parts generally have less machining on the outside, which...

• Direct bolt-in replacement for EVO engines • Can be used with stock valve springs, pushrods and lifters • Will respond well with performance exhaust and air cleaner • Will also respond well with increased compression and cylinder head work • 1650-5500...

• Designed with a tighter tolerance on the inner diameter for better fit to the pinionshaft which aids in eliminating cam timing variance due to crank sprocket fit • Testing has shown as much as 4° timing variance with loose fitting factory sprockets •...

• Designed to increase torque band width and increase fuel economy • Great bolt-in camshaft upgrade for stock 88" and 96" engines; also performs very well in 103" strokers and will respond well to increased compression and cylinder head work • Produces...

• Designed to increase torque band width and increase fuel economy • Great bolt-in camshaft upgrade for stock 88" and 96" engines; also performs very well in 103" strokers and will respond well to increased compression and cylinder head work • Produces...

• Designed to increase torque band width and increase fuel economy • Great bolt-in camshaft upgrade for stock 88" and 96" engines; also performs very well in 103" strokers and will respond well to increased compression and cylinder head work • Produces...

• Designed for riders who want more horsepower and the powerband higher in the RPM range • Requires high-lift valve springs (Fueling Beehive Endurance or High Load valve springs recommended) • Higher compression also recommended, along with performance...

• Designed for all-purpose 2-stroke riding • Durability, longevity and increased horsepower • Dedicated forging design for strength-to-weight optimization • Extra lightening operations for enhanced throttle response • Engineered, forged, and machined in...

• Designed and built for each specific 2-stroke powersports engine • Forged from high-silicon alloy for maximum strength and dependability • Dedicated forgings and additional lightening operations allow for optimized strength-to -weight ratio • Kit...

• Conversion camshafts are a hybrid, with early '99-'06 inner cam journals and late '07-'17 outer cam journals • Update old mechanical-style cams and tensioners to new-style hydraulic tensioner system • 525 Cam: • Designed to increase torque band width...

• Comes complete with crankpin, big-end bearing, small-end bearing, and washers • Easy to install - Honda TRX250R FourTrax (1986); Honda ATC 250 R (1986, 1985)

• Comes complete with crankpin, big-end bearing, small-end bearing, and washers • Easy to install - Beta 350 RR 4T (2015, 2018, 2025, 2019, 2016, 2024, 2020, 2023, 2017, 2021); Beta 390 RR 4T (2024, 2015, 2021, 2025, 2017, 2020, 2018, 2019, 2023, 2016)