I am not sure that there is no billet flywheel that will bolt on to a tec. HS50 or hs40. I remember asking ARC about a Billet rod and they said they did not have one. Someone here took the time to measure and find out that the 5.5 rod had the same dimensions. The dipper was slightly different but it worked fine. I had used that rod for a few years now and it works great. After I finish my Rupp project, (if the cold ever leaves) I am going to remove my HS50 flywheel and measure the taper angle and inside flywheel ID and outside ID and see if ARC has anything In the tec diameter and taper that fits. My tec is the later one with the CDI on the outside of the flywheel. If you have one with points and inside magneto I think you would be out of luck. Have to see if the tec CDI would fire with the ARC magnet arrangement and if no fit a Honda or clone coil to it.
There are different tapers to all the cranks.. I have an HS50 ball bearing points crank with the real big taper.. can't even use it because I have no flywheel for it...
BUT NO MATTER TAPER, you gotta get the right one... You can have an H50 crank, and HS50 crank, both with the same taper, but ya try to put an H flywheel on the HS.. the DEPTH is different.. The depth from the magnets to the taper is different...
An H flywheel would crash into the block before ever finding the crank.. HS would stick up off the engine an inch...
Ya know what i mean?? Crank shaft taper LENGTH varies on them too... where it lands in correlation to the world..
I guess if you are using the briggs wheel with an EIC motor you could just change the length of the mounting studs to make them align
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also, all EIC blocks still have mounting studs and parts for an older coil.. Studs are not tapped, but tap the holes and it is a magneto motor..