by bobscogin » Tue Jun 11, 2019 6:26 pm
I wasn't going to pursue the speedo issue today since I was painting. However, while I was waiting for my base coat to cure, I decided to use the time to get back on the speedometer drive investigation. I used the 23 tooth drive gear on the 18" wheel, It's diameter is actually .027 smaller than the 21 tooth 16 wheel drive gear. Since it was the smaller of the two, the driven gear teeth should have .0135 less engagement depth. I put modeling clay between a few of the drive gear teeth, installed the driven gear and rolled the wheel around a couple of revs. The photo shows what seems to be adequate engagement since it squished the modeling clay out to about 3/4 the depth of the teeth. I did not pattern the larger gear since the engagement depth will be deeper on it. Drawing on my auto experience, I know that it is not uncommon for car speedometers to use a range of teeth on a specific driven gear without changing the drive gear. Is that what Harley intended? Maybe not based on part numbers, but it appears that it would work and both my Pacer and my Scat had the same driven gear. I'd like some input before I install on my bikes. What say y'all?
Bob
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