BSP New and Improved Crankshaft. Balanced, Hardened, and heat treated. (2.130-2.133 GUARANTEED) Now with less flex. Best and strongest on the market!

BSP Clone Aluminum Powder Coated Air Filter Adapter Kit (Many Colors).

Block (crankcase)

GUARANTEED Light Weight Lifter Set (18-18.3 grams).

(NEW) Cylinder Head

JRPW Attack Series AKRA or NKA Machined Head.

Original Box Stock Project 6.5HP OHV (196cc) Engine (Assembled) Now with the new BSP-4 Cam Installed NEW (Race Ready Ruixing Carburetor, Tuned and Jetted Main .038", Low Speed .022")

Air Filter (Angled)

OEM Die Cast Aluminum Flywheel for Box Stock Project engines. It's BALCO certified and spin tested to 10,000 RPM's. Weight is 3.18 pounds. Fits 196cc and 212cc clone motors!

BUILT IN AMERICA WITH PRIDE BY THE BOX STOCK PROJECT INC.

The CL4 is specifically designed for the NKA rule package. With no minimum duration requirements, we were able to smooth the nose of the cam allowing it to rev well into the 7000 RPM range. The CL4 shows gains in the 6600 RPM range over our current CL3. T

Original Box Stock Project (Black Out) Engine Kit with ARC Flywheel NEW BSP-4 Race Cam