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  1. WinnerCougar74

    Fouling spark plugs

    No problem racerone. Sometimes this is how myths are eliminated. I'm still trying to fully understand the 2 stroke fuel recirculation system. Why does fuel pool up at the bottom of the crankcase? What causes the fuel to not stay atomized? Here is something else your comment made me wonder. Do...
  2. WinnerCougar74

    Fouling spark plugs

    Here is another thought. I simple recommendation is to only fuel up right before going on the water. Fuel that sits around a lot will evaporate then what's left over is not as flamable and also the oil content is to high. This could lead to fouling.
  3. WinnerCougar74

    Fouling spark plugs

    I don't think this video accurately shows how a crossflow outboard works. On a crossflow engine the atomized fuel has to make it's way past the crankshaft. From what I understand the turning crankshaft turns some of the atomized fuel into a liquid that "pools up" in the bottom of the crankcase...
  4. WinnerCougar74

    Fouling spark plugs

    Pennzoil Marine XLF synthetic blend @ 50-1 (12.8 ounces for 5 gallons)
  5. WinnerCougar74

    Fouling spark plugs

    Yes, after idling for an extended time like 15-30 minutes the engine will start to hesitate. It happened a few times and I throttled it up and it went away but eventually that didn't work. So I replaced the plugs and the motor runs great now.
  6. WinnerCougar74

    Fouling spark plugs

    So far it sounds like Chrysler outboards have a problem with this. So I will keep plenty of plugs in the parts box. Incidentally with the motor titled up the plugs are easy to replace even out on the water. I emailed a mechanic that restores Johnson/Evinrude motors and he claims these motors can...
  7. WinnerCougar74

    Fouling spark plugs

    Awesome. Does it make any difference which surface gap plug is used? Some have the extra spark enhancers built in to theoretically help with this.
  8. WinnerCougar74

    Fouling spark plugs

    I have been thinking about hooking up a vacuum meter to the tube that connects the 2 carbs to see if I can tweak the tune like you would with a 4 stroke.
  9. WinnerCougar74

    Fouling spark plugs

    It seems like you understand it. Thanks for sharing what you know. Does compression being down by 15-20 psi cause problems with these 2 stroke motors? (a commonly reported thing) Also, does the recirculation/puddling systems on these motors cause performance issues?
  10. WinnerCougar74

    Fouling spark plugs

    Thanks dingbat. That is very helpful. So far no one with a Chrysler outboard has posted their own experiences on this thread. I wonder if this is a problem with Chrysler outboards.
  11. WinnerCougar74

    Fouling spark plugs

    It seems to me that raceone's johnsons must have been in a tune up sweet spot. It would be great to know what that sweet spot is. What oil did he use? What gas? What regular maintenance? Was everything tuned exactly to factory specs? Were the Johnsons maintained by a professional mechanic or DIY?
  12. WinnerCougar74

    Fouling spark plugs

    I have owned this motor for 3 years. The only thing that seems not exactly correct is the compression is lower than factory spec. 137-140 with a good meter. In the 90's with a junk harbor freight meter. I also want to triple check my puddling system. I have read that if it isn't right it can...
  13. WinnerCougar74

    Fouling spark plugs

    I didn't want to offend racerone I just wanted to see if we can figure this out. I wonder what year racerone's johnson V-6 235hp was. Maybe it is a loop charged motor. I wonder if the loop charged outboards are better at not fouling plugs compared to crossflow outboards. This seems hard to pin...
  14. WinnerCougar74

    Fouling spark plugs

    So racerone is wrong. Chrysler 2 stroke outboards can not be tuned to run at trolling speeds all day without fouling the plugs. So this can't be fixed. You have to tune the engine to run at trolling speeds or high speeds. There is no one tune that will consistently do both. I think this is one...
  15. WinnerCougar74

    Fouling spark plugs

    Thank you. Such an important reply. I am glad this can be fixed. I found a factory service manual online that says to start the idle screw adjustment at 1 turn out. Most people say 1 1/2 turns out. If the engine runs good other than fouling plugs, is the most important adjustment the idle...
  16. WinnerCougar74

    Fouling spark plugs

    I wonder if the people that eliminate their CDI box have better results. It doesn't seem logical but you never now.
  17. WinnerCougar74

    Fouling spark plugs

    It did once but then it just stayed fouled and I had to replace the plugs then it ran great again. Just seems like 2 cycle motors can either be made to idle or run WOT but not both
  18. WinnerCougar74

    Fouling spark plugs

    Thermostat is 140 degree and the head runs around 137-142 depending on where I check it. So are you guys telling me you don't have this problem? Champion L20V. Also tried ngk buhw and buhx
  19. WinnerCougar74

    Fouling spark plugs

    My engine fouls plugs no matter what I do. Are these engines known for fouling plugs? Is there something I can do? Do the ignition boxes get week? 1974 Chrysler 135 hp 135 psi compression. Plugs are correct, timing is correct, new coil, points, plugs and wires. Running recreational fuel at 50-1...
  20. WinnerCougar74

    1978 Chrysler 85HP Powerhead Swap

    I am the same way. I can't keep at it cuz there are many other projects. I hope it all comes together for you. I have read some say after you get TDC you can time the engine with a timing light in the WOT position while cranking the starter. That sound like the best way to do it because it's...
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