6-25-2025
HP  Gold Cup 40 R/C REAR INTAKE #99-2104
HP .40R GOLD CUP .40 Gold Cup Rear Intake Radio Control #99-2104

This is the only .40 rear intake engine that boasts the high performance of a rear rotary valve design with reliable throttling ability. Radical intake and port timing produce fantastic top end with idling reliability only slightly compromised.

This is the only .40 rear intake engine available today.
HP.40R SPECIFICATIONS
Displacement
.40 cu.in. (6.5ccm)
Bore x Stroke
0.654 x 0.63
Power
1.26 hp @ 17,000 RPM
RPM Range
2500 ~ 18,000
Weight (engine)
9.4 oz
Prop Size
10x6 -- 11x5
Prop Nut Thread
6x1mm
HP.40R SPECIFICATIONS
Piston/Cyl Type
Conventional Ringed ABC
Crankshaft
Hardened supported by two ball bearings
Intake Type
Rear Rotor Disk Valve
Connecting Rod
Forged Aluminum Bushed at both ends
Carburetor Type
Twin Needle
Porting
Schnuerle with boost ports
Glow Plug
K&B 1L 7311 Std Long