- Mon Sep 18, 2017 12:17 pm
#70762
NottsBlue, as standard the C5, like the other current RE bikes, is restricted in the sense that the engine doesn't deliver all its available power because it has to meet noise and emissions regs. On these bikes, for which as far as I know the ECU cannot be directly remapped, there are two basic options to liberate more power without updating the engine itself. The more usual method is to buy a Power Commander (or the cheaper Dobeck). This piggy backs on the ECU and allows the fuelling to be altered. The options here are either to buy our host's PCV with a map already tested on a dyno or to instal the PCV and put the bike on a dyno to set it. Most use the former option because few radically change the engine sufficiently to warrant serious tuning, certainly on a C5. The other option is to buy our host's carb kit (what I did). The jets etc will be supplied according to the exhaust and air filter and of course changes can easily be made. As stock the bazooka exhaust is probably the most restrict part. Whilst you can just put a less restrictive exhaust pipe on and not bother with the ECU, more performance will be liberated if you change the restriction on the inlet side too as the power is gained by getting more fuel into the engine and then getting the exhaust gasses out. I opted for our host's British chrome silencer and matching chrome exhaust pipe. This, together with the cone air filter on the carb has resulted in a more lively, louder and less constipated engine. People can and do grind cams and rework heads for these bikes, liberating a lot more power but IMHO that's not what the C5 is about - the frame, suspension and brakes get a bit marginal at the top end anyway. If I were you I'd get hold of our host's splendid catalogue in which there are many goodies (or go to the website).
Hope that helps.
