Posted by tractorguy2 on February 16, 2017 at 07:25:19 from (64.147.38.198):
In Reply to: Magneto ID questions posted by Rich'sToys on February 15, 2017 at 14:24:24:
The top two are Bosch. I have little experience with them.
The farmall is an H4. Parts for there are easy to find and not expensive.
The last photo is a type J fairbanks morse. Distributor caps are pricey. This mag has a set of internal gears that must be timed correctly when you reinstall the cap. You also need to make sure the fiber gear does not hit the condenser. If it does the teeth on the gear will not last long. That's a $60 gear.
I have never had a problem with aftermarket points or condenser. I repair about 40 H4 magnetos every year plus a few FM and Wicos
You can find all the parts you need at McDonald carb.com
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