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Kohler L600 vs L654 choke wiring

Kenny Crenshaw

Registered
Someone here was kind enough to lead me to a schematic for the controller on my 6.5 KW with an L600 engine. My original choke is rusty, and so I bought a similar one on Ebay (Sisson 700 series). But, the Ebay chokes are always 6 volt, with only one connection for the 6 volt hot wire. On my unit the original choke had two leads running to it, one is hot all if the time, and one grounds when you hit the starter switch. I would like to use my Ebay 6 volt choke. I noticed on the schematic that the L654 had one wire running to the choke that becomes hot when the engine cranks. Why did they do that, and can I use the L654 wiring along with a resister (I have an old ignition wire in ceramic resister)?
 

jack0

Registered
Age
61
Not sure what you have here. Does your diagram indicate a 2 wire choke?
I have never seen 2 wire chokes on these plants. Could it be that the starting contactor and choke are ground actuated? Which is not the norm.
Usually the choke and starting contactor are energized B+ through the crank-run and coil clearing relays.

Maybe if your starting contactor is ground actuated and you have the aux. terminal that goes B+ you could use the 6v. one wire choke with the correct size resistor.
 

Thaumaturge

In Memory Of
Age
69
Last Subscription Date
07/12/2019
I think that the hot lead to choke runs from hot lead to coil. If so, just insert a voltage regulator circuit such as this;
using suitable heat sink for both 2N3055 & LM317. ANY beefy enough NPN transistor will work for the 2N3055, including 2SC5200. Voltage output is set by pot.
Doc
 

Kenny Crenshaw

Registered
The wiring diagram for my controller shows a two wire setup for the L600 and a single wire setup for the L654. The L654 hot wire runs off of the 2CR relay output that goes into the RR relay. The one wire going to the choke is hot all of the time and the other wire goes to ground through the ignition switch.
 

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Thaumaturge

In Memory Of
Age
69
Last Subscription Date
07/12/2019
The 6v ebay choke likely has a hard wired chassis ground. My circuit only drops voltage. But a simple thing to add an automotive relay to circuit you got.
Doc
 

jack0

Registered
Age
61
Could you post the complete ladder diagram?

Wondering if this plant was the end run off the L600 during the transition period to the L654. Did they put on the Kohler side draft carb (2 wire choke that's normally seen on the L654) or do you have the Tillotson updraft carb with the Sisson choke on the exhaust manifold?

I have a L654 with a side draft carb and the radiator of an L600. I wonder if those years were a mix and match trying to use up old inventory.
 

Zephyr7

Registered
I wouldn’t use a solid state active voltage regulator to run a choke. Inductive kick is likely to fry the regulator without protection, and active voltage regulation isn’t needed here — this is a non-critical application in terms of voltage stability. Also, for under 5A, you can just use an LM338 and be done.

I’d use either a resistor, if you can easily calculate the load, or a Beefy zener diode reverse connected in series with the choke if you can’t. If you use a 6V zener diode rated for the current of the choke, and connect it “backwards” in series with the choke, that one zener diode will drop 12v down to 6v. A 0.1uF ceramic capacitor across the diode will help a bit with protection. Either the zener or the resistor will be much more robust than an active voltage regulator.

Bill
 

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