I have been slowly getting things together for a timing wheel. I had initially tried to download some that were available online, but didn’t care for the resolution of the ones I found. Eventually I found this one on Ebay for $6.
Here are the parts I used to assemble it. An 8mmx 1.25x60 mm bolt. Two 8M x 1.25 nuts, two 3/8 inch sealing washers with a rubber washer bonded to one side and a 3/8” coupling nut which would normally be used to join threaded rod.
Had to drill out the disc to accept the 8mm bolt. Used the two sealing washers on either side of the disc and one of the 8mm nuts to snug them up. May replace that nut with a lock nut later. I tightened it so that the disc is held firm but can not so firm it can’t be rotated between the washers to make adjustments.
The 60 mm bolt is just the right length and holds the disc about 1/8 inch away from the case. I had wanted to find an 8mm coupling nut but could not find one locally. So instead I used a regular 8mm nut and a 3/8 inch coupling nut. The coupling nut slides closely on the bolt but is too big to engage the threads. I cut a tongue and groove on the two nuts so that I could use a 9/16” open end wrench to lock the grooved 8mm nut against the crank end to hold it all in place. After it was in place with the spark plug removed and my home brew piston stop in place, I used a 13mm box end wrench on the bolt head to gently rotate the disc and crank. I fixed a short length of 12ga copper wire under the rear clutch inspection cover screw for a pointer and was able to find TDC and set my set my static timing. It all works pretty good and was under $10 to make.
Thanks for looking.