Some late breaking results just in.
A member here, "longstrokeclassic" is also a member of a forum in the UK, which I also participate in.
And he decided to do the cam rephase on his 350. I worked with him by internet on the proper instructions, and he did it, along with some other mods.
At first, he had too much power for his clutch to handle, but he upgraded it, and rectified that issue. And he did a bit of running-in for the engine, and then reported. Then when he finished the clutch work, he put the cams back to normal alignment, and ran it to see what the difference was between the 2 different cam timings.
Here is his latest report, which I lifted from his post on the UK forum;
"Whilst fitting the uprated clutch I took the opportunity to swap the inlet cam back so all the timing marks correspond, but left the 3 way pinion insitu running in the advanced position. What this revealed was what I mistakenly thought to be a carburation problem was a soft spot in power delivery at low revs. This disappeared when reverting back to normal cam timing but was also accompanied by a noticable loss of power at the same time.
Without the aid of a dyno I can only hazard a guess at what was happening.
But this is what I think.... With the rephased cams there was a noticable drop in power at low revs but I dont think this was so much a loss in power over the standard setup, but the rephasing providing a sudden increase which made everything below it seem flat in comparison.
Nothing like the sudden power delivery of a two stroke twin or triple coming on song but more like the difference between riding the along flat and then going down a steep hill.
I intend to run the bike with the rephased timing (with the inlet running retarded) because although this provides something of a slight jeckyll & hyde power delivery it does mean I can still potter around at 45-50 without really noticing any difference or can open the bike up and take advantage of the extra acceleration and increase in top speed over the standard when the mood takes or the need arises.
Quite a successful outcome -"
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So, we see that he got exactly what was expected. He kept approximately the same power as a stock Bullet in the lower revs, and got a significant boost in the upper rpms.
Still very roadworthy and manageable, and spirited when he wants to run hard.
So now we know it works fine on 500, 535, and 350.
I'm still awaiting the report from the 612 user, to see how he liked it.