Browsing on e-bay found this aprillia 23D70 SAPC box ...
According to rgv250.co.uk
"Aprilia ignition box. It was derived from the 23d10, but they changed the ignition timing to be slightly retarded compared to the race-kit box, and modified the opening times of the power-valves. It has 4 degrees of pre-ignition, but with the 5 degree ignition advancer kit (FZR400 woodruff key) it would produce almost the same advance curve as the 23d10. NOTE: Having now run the box back to back with a 22D30 on the dyno
(Jan 05) no difference could be found. I wonder if the Aprilia "tweaks" are just urban myth?"
However I decided to give it a try .. It will be interesting to see if it will make any difference on a modified motor compared to the standard 22D30 SAPC..
Anyway I only paid 5 quid for it ..
