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[Haggis]

: Before fitting the acewell, it is necessary to find how far the vehicle moves with a single turn of the speedo cable.
Mark the tyre and ground, and push forward 1 wheel revolution - measure the distance travelled in MM.
Put a piece of tape on the end of the original speedo cable to produce a flag, push the bike forward 1 wheel revolution again, but this time count the number of revolutions of the speedo cable.
Divide the distance travelled, by the number of rotations of the speedo cable, and enter this number into the acewell.
e.g. If the bike moves forward 1700mm and the speedo cable turned 3 times, then enter c:0567 into the C screen. If your speedo has a P screen then ensure it is set to P:001

As the enfield speedo is a Two to One drive ratio you would have to divide your tyre circumference by 2.

[grayhorse]

I woke up this morning and kicked myself for not counting the revolutions the speedo drive made on a full rotation of the wheel, and recalling most of the drives I’d read about were 2:1, and hoping it wasn’t 1.612:1 or something peculiar on the 2020 model.

Thanks for the info. Much appreciated!

: Before fitting the acewell, it is necessary to find how far the vehicle moves with a single turn of the speedo cable.
Mark the tyre and ground, and push forward 1 wheel revolution - measure the distance travelled in MM.
Put a piece of tape on the end of the original speedo cable to produce a flag, push the bike forward 1 wheel revolution again, but this time count the number of revolutions of the speedo cable.
Divide the distance travelled, by the number of rotations of the speedo cable, and enter this number into the acewell.
e.g. If the bike moves forward 1700mm and the speedo cable turned 3 times, then enter c:0567 into the C screen. If your speedo has a P screen then ensure it is set to P:001

As the enfield speedo is a Two to One drive ratio you would have to divide your tyre circumference by 2.

[grayhorse]

That was the key. In the end i put P=002 for number of pulses per revolution. I bought a $40 GPS speedo that confirmed my guess, and I’m happy with the installation. On to the next challenge!

Thanks for all your help.