Chung Yang GP460 Engine 4,2+HP / CY460 Engine

The new GP460 engine is a 45.7cc (42mm bore, 33mm stroke) performance machine. Designed after the high-revving Zenoah RC style motors, it features a 4 transfer port 42mm cylinder, high-performance case pulsed Walbro carburetor (19mm bore, 15mm venturi, independent high and low jets) "hemi"-style combustion chamber, and full-circle crankshaft. The combustion chamber clearances have been improved for better thermal control, resulting in more uniform thermal expansion characteristics and reduced dynamic stress at high operating RPMs! Includes 78mm three-shoe inner clutch assembly preinstalled.
For Scooters: GTR46,GTR40, Super Go-Quad 46,Riot and SGSR46R. Also fits GSR25, GSR26R, GSR29R, Go-Quad 25, Super Go-Quad 30, Crusier.... when used with 78mm motor mount (040916)
For R/C: Fits 78mm clutches used on many RC cars, boats, and airplanes.
Engine Stats: Displacement: 45.7cc. Power: 4.2+HP at 18,000 RPM, 2.35 lb/ft torque at 8,000 RPM. Fuel: 91 octane or higher mixed 25:1 with 2-stroke oil (Castrol Power 1 Racing)

Specifications:

45.7cc High Output Race Engine
Horsepower 4.20HP at 18,000 RPM
Torque = 2.315 lb-ft (0.32 kg-m) at 8,000 RPM
Includes fabric air filter w/ anodized aluminum protective shroud

The best adjusting of the carburettor without tuning is:

H= 2 ½
L= 1 ¼