QUILL RACE CAN

Initially I run the bike through the winter without re-jetting.

The graph below is without any jetting, and on the standard filter. The bike had covered just over 10,000mls when it was run and had the standard air filter.
Note: the standard filter is just as good as a K&N - in fact, it may be better since it is specifically designed for the ram air effect.

Below is the dyno graph after fitting the end can. A peak output of 140bhp

The boys at DSD (Dyno Speed Developments) reckoned that the CO was OK and the fitting of a DynoJet kit would not be worth while. There are also some reports about ridged needles wearing out the jets - not good since they are non serviceable items.

The Result - Well Worth it

An obvious improvement.

It sounds much sportier, maybe a little too loud - but haven't been pulled over yet.

It is definitely seems more response throughout the rev range. The increase in power is noticeable and front wheel lifts even easier now.

It just starts to pop on the over run (3-7000rpm), indicating that the CO may just be on the low side.I'll leave it a while and see if DynoJet worries are well founded or not, then may consider getting it jetted. It might also be possible to raise the needles, but you will have to buy the Dynojet kit to scavenge the parts.