HOT CAMS Exhaust Camshaft - Stage 1 (Ref. 4035-1E): designed for motocross riders who want more engine character without transforming their base. Developed and validated on test benches and used by teams, this Stage 1 profile increases torque and power while remaining compatible with an original engine configuration — ideal for a small preparation dedicated to trail riding or training park.

Key Features:

• Profile designed to improve responsiveness and revving without requiring other major modifications.
• Installation recommended by a qualified mechanic: precise timing adjustment is essential to take full advantage of the product.
• Supplied with two complete sets of shims to adjust the timing and refine tuning.

This Stage 1 targets users looking for a net gain in engine torque and a better riding feel without modifying the cylinder head or fuel system. Do not overlook the tools and expertise required for installation: timing, valve clearance checks, and safety verifications remain crucial.

Main compatibilities (examples): YAMAHA YZ 426 F (CJ01, 2002), YAMAHA WR 426 F (CJ02, 2002), YAMAHA WR 400 F (CH04, 2000).