The exhaust port diameters were made to match the Jolly Moto pipes that I have (older version, 2 pipes on each side).
I think I remember this correctly, but I haven't actually measured it myself: The volume of the compression chamber is 11.5 cc each, but Rolf said he usually went down to 11.2 or 11.3, to get maximum performance on super (98 octane). I wanted the slightly lower compression to get a more durable engine, especially since the petrol today isn't always very good.
Rolf could also bore the carbs (which I haven't done on my bike).
My Gamma was quite slow before (completely stock). I could get to 200-205 km/h (approx 120 mph), but 5th and 6th gear felt like an overdrive. (mileage: 30000 km, 20000 miles). It would not rev above 9500-10000, but power started at 6000-6500.
After the tune, I started out with 160 mains and an opened-up stock air-filter (most of the plastics removed, filter retained, all on Rolf's recommendation), and a 17 teeth front sprocket (16 stock). Now only 6th felt like an overdrive, and the bike does 230-240 kmh (150 mph). The bike now revs to at least 12000-12500, and power comes on at 7500-8000. No dyno-figures available.
A set of Lance Gamma Uni-filters & fuel-valves are on the bike now, and a set of smaller sprockets are on for testing, but I haven't had much time for it this summer. The bike also has a steering-damper now (Recommended!) and an EMC Dynamics rear shock. The rear shock is approx 10 mm longer than stock, to improve handling, especially with diferent wheels. I will thus try different wheels (3"x17" & 3.5"x17" fronts and 3.5"x17" and 4.5"x17" rears. Lots' of wheels seem to be easily adapted to this bike (GSXR400, RGV250, GSXR750/1100, etc).
RG500 Index