Honda TRX 450R HP4 Valve Train Kit Kits include Camshaft(s), HD Valve Springs, Shortened Valve Guides and Big Valve Kit. The HP4 kit is the ultimate valve train upgrade for your sport or racing ATV.

Yamaha YFZ 450 HP4 Valve Train Kit Kits include Camshaft(s), HD Valve Springs, Shortened Valve Guides and Big Valve Kit. The HP4 kit is the ultimate valve train upgrade for your sport or racing ATV.

Suzuki LT-R450 HP4 Valve Train Kit Kits include Camshaft(s), HD Valve Springs, Shortened Valve Guides and Big Valve Kit.

Honda 400EX HP4 Valve Train Kit Kits include Camshaft(s), HD Valve Springs, Shortened Valve Guides and Big Valve Kit. The HP4 kit is the ultimate valve train upgrade for your sport or racing ATV.

Yamaha Raptor 700 HP4 Valve Train Kit Kits include Camshaft(s), HD Valve Springs, Shortened Valve Guides and Big Valve Kit.

Suzuki LTZ- Kawasaki KFX 400 HP4 Valve Train Kit Kits include Camshaft(s), HD Valve Springs, Shortened Valve Guides and Big Valve Kit. The HP4 kit is the ultimate valve train upgrade for your sport or racing ATV.

Honda 300 EX HP4 Valve Train Kit Kits include Camshaft(s), HD Valve Springs, Shortened Valve Guides and Big Valve Kit. The HP4 kit is the ultimate valve train upgrade for your sport or racing ATV.

Yamaha Raptor 660 HP4 Valve Train Kit Kits include Camshaft(s), HD Valve Springs, Shortened Valve Guides and Big Valve Kit. The HP4 kit is the ultimate valve train upgrade for your sport or racing ATV.

Warrior/Wolverine/Raptor 350 HP4 Valve Train Kit Kits include Camshaft(s), HD Valve Springs, Shortened Valve Guides and Big Valve Kit.