What spark plugs are you running in your M18?

[AHS 1,546]

Ok, what’s spark plug are you using in your M18? Would there be any difference between the Kohler 17 2 series and the M18? The 17 series 1 + 2 were Champion RBL 15Y, those aren’t available anymore. I don’t know what the M18? The 17 series 2?

[953 nut 60,007]

Champion RV17C gapped at .035 is called for in the Kohler service manual and that is what I have been using in my 418-C

[squonk 43,820]

I prefer Autolites. RBL15y crossed to an Autolite 25

[RED-Z06 2,574]

When they come in, which is rare, i go with Champion RV17C but gap them tighter at .030", usually they come in with a washer sealed plug jammed in the hole.

[c-series don 10,032]

@RED-Z06 What is the advantage to closing the plug gap? 

[RED-Z06 2,574]

1 hour ago, c-series don said:

@RED-Z06 What is the advantage to closing the plug gap? 

Some Engines feel like they idle a bit smoother, and accelerate a bit cleaner, could be old coils not quite putting out rated voltage.  Magnums, like Onans, really pour on the fuel when you get into the governor and the resistance at the plug goes up, if it exceeds the coils power output you get no ignition.  A wider gap means more power, but its a balance.  I used to see a bunch of Snapper Joystick Z mowers and Craftsman GTs with Magnum Twins.  Sometimes you'd get a momentary dead miss on power up on one side, close up the plugs a hair and that completely went away.

[AHS 1,546]

21 hours ago, RED-Z06 said:

Some Engines feel like they idle a bit smoother, and accelerate a bit cleaner, could be old coils not quite putting out rated voltage.  Magnums, like Onans, really pour on the fuel when you get into the governor and the resistance at the plug goes up, if it exceeds the coils power output you get no ignition.  A wider gap means more power, but its a balance.  I used to see a bunch of Snapper Joystick Z mowers and Craftsman GTs with Magnum Twins.  Sometimes you'd get a momentary dead miss on power up on one side, close up the plugs a hair and that completely went away.

Now, does a kohler 17 series 2 have the same plug? They have 2 different ignitions; points in the 17 vs magnum in the 18?

[Gasaholic 297]

30 minutes ago, AHS said:

Now, does a kohler 17 series 2 have the same plug? They have 2 different ignitions; points in the 17 vs magnum in the 18?

Close enough - We used to run Champion RV15YC , and a pretty standard seat of the pants gap of .030 which we ran in almost every other engine brand we handled (which was pretty much Briggs or Tecumseh or Onan - Kawasaki was relatively rare to see for us back then in the 80's )  These days seems the RV15YC (Which I believe was a "Chevy Plug" back then before the 305 and 350 V8's went "metric" AKA sized in liters) is hard to find except maybe on Amazon..