O.S. is gearing up for triumph at major 1/8 scale on-road championships using the 21XZ-R ABC! Tungsten-weighted crankshaft produces optimum stability for constant low- and mid-speed torque.
The cylinder liner features 7 scavenger ports and 3 exhaust ports for substantially more efficient combustion.
The crankcase and 21M carburetor are newly designed.
Lighter piston.
More powerful con pole.
Copyright © 2008-2024 rcjaz.com.au All rights reserved