The Suzuki RG250 Gamma was a two cylinder parallel,
water cooled 250cc two-stroke motorcycle produced
by Suzuki from 1983 to 1987. One of the major
features of the RG250 Gamma was its incredible
power to weight ratio. Able to produce up to
45+ BHP at 8,500 RPM and 38.4 Nm torque at 8,000
RPM, weighing in at roughly 130 kg. The RG250
Gamma was the very first mass-produced motorcycle
to have a lightweight aluminum frame and racing
type aerodynamic fairing.
The Gamma also had a very advanced 'Full Floater'
suspension system for its time, with the first
Mk1s having 'anti-dive' front forks (which locked
the front forks under hard braking to stop them
diving). Due to this, the bike was dubbed the
first street legal racer. In the 5 years of
production the model underwent three major changes:
- Mk1 (1983-1984): 45-46 hp and 38 Nm torque.
Very 1st bikes had a single brake disc on
- Mk2 (1985): Revised front fairings, mudguard
and colour scheme and a slightly shorter wheelbase
(from 1385 mm to 1360 mm)
- Mk3 (1986-1987): Introduction of Suzuki's
AEC system (Automatic Exhaust Control). This
gave the bike a much higher (around 49-50+hp)
power rating, however I have not yet found
any quoted figures.
(AEC system: Same idea as the now standard
power valve design, but by using a 'butterfly
flap' to open and close an addition chamber
on the cylinder head (open @ low RPM, closed
at higher). This effectively expands the exhaust
system at low RPM, to allow the exhaust to
be tuned for high RPM. The AEC system opens
at around 7500 RPM)
- Mk4: (1987): There was also a very shortlived
Mk4 version created for the Japanese home
market, which had larger front discs, thicker
tyres and larger diameter front forks. This
model was never exported, so any Mk4 will
be private imports.
The RG250 Gamma was replaced by the RGV250
Gamma (V-Twin) in 1988.