Nice one
After all the discussions here about the cams profiles and the usefulness of retarding stock inlet cam by 1 tooth, do you think it really brings much benefit to do the same with H's performance cams ?
My 535 engine is already quite peaky although there are other mods on the head and the intake tract. It only starts to pull from 4K RPM with the long intake horn and 4.5K with the shorter one.
So I'm not sure it is useful to push the torque curve even higher in the RPMs.
.
Thanks, Taurim! Well, it sounds like yours doesn't get 'on the boil' until quite late in any case, for whatever reason, so retarding the inlet timing is probably not on the cards for your machine, unless you have already done so [which I seem to think you may have done]. The two examples I have tuned by fitting carbs, valves and cams from Hitchcocks, as well as shortening the cylinder barrels - a third machine is all done but still waiting for cams - have lost a small amount of bottom end power with their inlet cams retarded, but still pull well from around 3,000 RPM. You could, possibly, consider advancing your inlet cam timing to gain more bottom end and mid range pull, but mind the inlet valve and piston don't get too close to each other, if you do!
Also, regarding the third machine, this has a carb conversion [Mikuni this time for some reason], light porting etc on the head and shortened barrel, but Hitchcocks have no cams at present and this machine has been waiting for a set. that said, it is running with the standard cams fitted and I suggested retarding the standard inlet cam, but the owner wasn't interested in doing that, although I will be riding this machine soon, with the standard cams in place and on standard timing, so that might be interesting.
B.W.