Ok, for those you didn't follow other thread, read this link below on how Jon
(searstractor fan- "STF") developed a replacement ignition on the Tecumseh motors for the failed SSI module using a pickup and coil that is used on pulling tractors. Jon adapted this system to the Tec motor, he needed a real world test mule, I had a 1977 16/6, OH160 with bad SSI unit, we only live 45-50 mins apart, perfect match. I used tractor for several hours under varying degrees of load, mainly grass cutting and performed very well so I bought my parts, this documents final install and parts list/costs.
This tractor actually runs smoother, maybe little cooler, and seems to be quieter and no longer has as much what I would call valve noise. I am very happy with the setup.
I take no credit for this system other than documentation and pics of final installation on my tractor.
After testing this system, I have only found too drawbacks.
1. Since it converts to battery ignition, you must have good working charging system to keep it running. There are many other tractors that are the same, so guess not really bad point. Any other conversion out there also runs off battery so really no choice.
2. You must remove pins from flywheel and glue in a magent. It will most likely require you to drill out hole so that will ruin flywheel if you ever want to go back. Since this is an upgrade and I will never go back, not really a bad point either.
This is a thread on Jon's conversion, but I want to mention there are also other conversions out there. Best thing I like about using Jons', it eliminates the control module that the other conversion out there must use. Just a trigger and coil. With that said, I will be trying to convert my old SSI module to use as trigger and use Ed's setup on the ST16 I am restoring just to see if I can.
Ed Stoller at earthandmagnets.com, Dale Colvert at overnightsolutions.com, and Brain Miller at gardentractorpullingtips.com.
The following is a list of parts and "my" costs to get them to me. Jon was able to do this cheaper as they see the parts dealers at the pulls they go to so he doesn't pay shipping. It was just as cheap for me to go ahead and order as to have Jon get them and then pay gas and the time to run up to his house.
1. Single cyl flywheel pickup trigger
This comes from Midwest Super Cub and primarily used on Kohlers. I emailed them, asked for trigger only with out magnetic ring or bracket. Total was
$69.xx, make sure you ask for USPS flat rate mine was $6.25, UPS is $15 for shipping.
2. Bosch Blue coil
Jon recommended going through Nichols performance. You have to make sure you get a 3ohm coil, they had best price even with shipping and Ohio tax.
I paid $47.xx to the door.
I did find a no name brand coil that is supposed to be same as the Bosch, I can't recommend, use at your own risk.
3. Spark plug wire
Jon was using performance MSD auto wire and adapter on his coil, I happen to have an old set from a points car so I used that so no $$$ in this one.
Nichols lists wires on above link. I think Super Cub and also Brian Miller sell them. Maybe able to get just coil wires at local auto parts store also.
4. Off/on toggle switch
Pretty self explanatory. I got a 20 amp switch from Tractor supply for $3.99.
5. Trigger bracket
Jon spent some time making this little bracket to get timing set to about 30* while running. I will be sending his back to him and I made a copy so if needed, either of us would probably send you one. No $$$$
6. Various connectors, wire, nuts/bolts
Depends on what you have. We both had most of spade/butt connectors/wire.
I did have to buy 2, 4-40 machine bolts and lock nuts from Menards, These cost about $1.29 or so total. These are super small bolts needed to hold trigger on brackets. Anything much bigger and they won't fit, super small.
I also used heat shrink on connections and installed fuse in line before switch, both I already had.
7. Magnet for Flywheel
Jon said he used the magnet from on old magnet screwdriver tip? I found some on the web and as of this writing will be ordering a couple. I am using Jon's flywheel so I need to convert one of mine. The original pin holes are about 3/16" so I am ordering these and maybe one 1/4" just in case. Jon drilled out hole, mounted magnet using JB Weld. It is important to make sure magent is oriented properly to trigger switch...Jon can answer that one
Pics in next post.