This is the O.S. 12XZ(P) Speed ABC Engine with 12FB Slide Carburetor.
FEATURES: Specially coated silicone filled crankshaft with precision ceramic
bearing that greatly reduces wear and friction, plus a Tungsten
weight for added balance at higher RPM
Meets IFMAR regulations
Machined aluminum outer head with holes drilled for lighter weight
and better cooling
Newly designed crankcase and liner port for increased torque at low
to mid speed
New 12F(B) slide valve carburetor designed to match power
characteristics of engine
ABC cylinder liner construction, "A"luminum piston with "B"rass liner
that is "C"hrome plated
INCLUDES: O.S. 12XZ(P) Speed ABC Engine with 12FB Slide Carburetor, 5.5mm
reducer, RP6 turbo glow plug, exhaust gasket, two dust caps and
instruction manual
REQUIRES: Fuel: 10-30% nitro content, 20% recommended for break-in
Exhaust System: Depending on vehicle
Air cleaner assembly, glow starter and track equipment
SPECS: Displacement: 2.1cc
Bore: 13.8mm
Stroke: 14.0mm
Practical RPM: 5,000 - 44,000
Power Output: 1.75ps/35,000
Weight: 8.1oz (230g)
Height from crankcase bottom to top of cylinder head: 3.54" (90mm)
Height/crankshaft center to top of cylinder head: 3.01" (76.6mm)
Width including mounting tabs: 1.53" (39mm)
Width not including mounting tabs: 1" (25.4mm)
Width between mounting holes same side: 0.43" (11mm)
Width between mounting holes opposite side: 1.23" (31.4mm)
Cylinder head diameter: 1.93" (49mm)
Length of exposed crankshaft: 1.16" (29.5mm)
Length from backplate to front bearing: 1.96" (50mm)
Length from backplate to end of crankshaft: 3.1" (79.5mm)
Internal thread size at end of crankshaft: 1/4-28
Carburetor Settings:
Needle Valve, Approximately 2-1/2 turns open from fully closed
Throttle Stop Screw, Approximately 1mm visible from carb throat
Mixture Control Valve: Rotate until slotted head is flush with
carburetor body
(Make adjustments only in small increments. Refer to manual for
full break-in and carburetor adjustment instructions)