Hi,
The 16/25 timing also applies to the 500/600 "sports" sidevalve
(only this afternoon I was timing up a J.A.P KT V twin (1929) and it has overlap , I have not measured up the amount yet as I put the crank pinion for a minute down and it seems to have gone AWOL
Some years ago I was asked to come up with cam timing for a 1904 Minerva single cylinder car when a new cam had to be made. I suggested the J.A.P 16/25 timing , It worked out well, The owner of another Minerva visited and test drove the car commented "I wish mine went that well"
I know that owners of Veteran Triumphs play with the cam timing to improve performance and hill climbing by advancing the inlet cam (?)
Does the Humberette have a single or separate cams? experimentation is more difficult with a single camshaft
The J.A.P KT has three key ways in the crank pinion so the timing can be fine tuned
John
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