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Procycle, would you be interested / available to make any more of those?
I'd be happy to. I will PM my mailing address.
There are a couple of pitfalls in using a pulley for this. There's enough slop in the bolt holes that it's a bit fiddly getting it bolted up concentric on the crank. The pulley I used wasn't all that accurately manufactured. The center hole wasn't concentric with the edge. For a belt it doesn't matter that much but for consistent gap to the hall effect sensor it does. It would be nice If I had pinned the pulley so it can only go on one way.
Also, if I make one for you I'd suggest that I don't machine the gap. Instead, you grind one tooth out after you have your pickup in place and the gap offset figured out. I had mine wrong when I took that last photo. The engine is at TDC and the first tooth is lined up with the sensor. That's wrong. I had to move the trigger wheel so the first tooth lined up with the sensor at about 40 degrees before TDC.
I have a small lathe but no milling machine and no indexing table etc. so I would not be able to fit any of that on my tooling.
Thank you. Back to the regularly scheduled thread!