CH25S MDI tach?
 

So this was really a Simplicity question
(begging forgiveness), but I think there are more folks here than on that forum and the Kohler ch series v-twins are the same either way so I'll pose the question here. I have a ch25s that the original ignition went bad on and of course replacement parts are no longer available and the update to the MDI ignition was required (new flywheel & coil packs). The problem??? NO provision for tach hook-up! Kohler says "sorry, you're out of luck". But I'm thinking there has to be a way. Ideas? The factory dash tach requires a high voltage signal spike (similar to an older tach that would hook to the negative side of a ignition coil)

You might try to wrap the pickup wire 4 or 5 wraps around one of the spark plug wires.

Sure worth a try, I wouldn't thought of that.:bigthink:
Other wise one of those cheap tiny tacks from China will give you RPM's

If you do that on a twin you will need to multiply the number by 2

That is too broad of an assumption.
Some 2 cylinder engines fire both plugs @ the same time.
I.E, a wasted spark design/system.
I can think of several that fire both plugs @ the same time.:bigthink:
You would divide .
Also 2 stroke vs 4 stroke

You are correct. I should have been more specific. I was really replying more to this specific case in point.unless im mistaken the ch25 is not wasted spark correct?

coop, I have no idea, I'm old skool, never had my crepey fingers on one.:bigthink:

You are correct. They have 2 coils

I believe it is wasted spark. I can't think of a Kohler twin that you'll find in a cub that isn't wasted spark.

All of the Magnum and KT engines are. There are two separate coils on a CH, but they both fire every time the flywheel goes past them.

So... there are 2 coils. They are triggered by the flywheel passing the coil. Theres only one magnet on the ch25 flywheel. The coils arent mounted togerher. So how could they fire at same time ?