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  #1  
Old 11-23-2018, 01:23 PM
RAC65 RAC65 is offline
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Default 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)
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Old 11-23-2018, 03:15 PM
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RLause RLause is offline
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You might try to wrap the pickup wire 4 or 5 wraps around one of the spark plug wires.
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Old 11-23-2018, 04:56 PM
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Quote:
Originally Posted by RLause View Post
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.
Other wise one of those cheap tiny tacks from China will give you RPM's
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Old 11-23-2018, 05:17 PM
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If you do that on a twin you will need to multiply the number by 2
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Old 11-23-2018, 05:40 PM
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Originally Posted by cooperino View Post
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.
You would divide .
Also 2 stroke vs 4 stroke
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Old 11-23-2018, 06:15 PM
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Quote:
Originally Posted by ol'George View Post
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.
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?
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Old 11-23-2018, 07:44 PM
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Quote:
Originally Posted by cooperino View Post
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.
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Old 11-23-2018, 07:49 PM
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You are correct. They have 2 coils
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Old 11-23-2018, 10:25 PM
Gompers Gompers is offline
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Quote:
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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?
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.
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Old 11-24-2018, 08:48 AM
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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 ?
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