for the 10.5 i would start around a 6.2- 6.5.
Thanyou.
You can always play with the gearing.
Did try a larger then a smaller pinion but didn't really make much difference apart from more heat.
you could go down on the delay
which one, #13 or #14
Think I went the wrong way at 5.81 to 5.65 with 10.5
I'll try dropping pinion and do some laps and get temp reading.