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  1. #1
    GPRPITMAN's Avatar
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    Guys check your plugs!!!!

    I have had several phone calls threw the week to ask about jetting, when asking if they have done plug chops the answer was no everytime. Ask what color the plug was and it was either dark dark brown or blackish, So I suggested to do plug chops on a wide open throttle run and now the phone rings and plugs are white white. some have never done plug chops before so just a reminder about doing some high speed chops will save some of you guys a lot of money and also increase in your mph when your boat needs more fuel. Example lets say your rpm reading is at 7000 at wide open, Run your boat up to around 6800 to 7000 pull the landyard without getting off the throttle make sure you have your plug wrench with ya and pull each plug and look at them this way you can see where your at. Lots of boats out there are running on the lean side at wide open just a reminder guys to save you headaches in the long run and it will give you extra mph when carbs are dialed in correctly


  2. #2
    mrbtd's Avatar
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    with a WOT plug chop shouldnt it be whitish with a nice coffe brown ring around the inside ?

  3. #3
    GPRPITMAN's Avatar
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    Quote Originally Posted by mrbtd View Post
    with a WOT plug chop shouldnt it be whitish with a nice coffe brown ring around the inside ?
    The ground strap can be a whitish color however I still like a little tan to mine. But the porcelian should not be white to lean

  4. #4
    mrbtd's Avatar
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    Great topic for a Monday morning

    I got this picture from here
    http://www.dansmc.com/Spark_Plugs/Sp...s_catalog.html

    Do you agree this is a good plug color ? I am going to do some chops today just to be sure but I think this is about me.

    Does the age/time on the spark plug matter ?
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  5. #5
    GPRPITMAN's Avatar
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    Yes thankyou for posting up the chart and that plug is exactly what I am talking about I think alot of the guys are running in the #'s of the 22 to24 range which it says ok but lean and if your going out pinning that throttle for long distances I would be a little worried of lean sieze

  6. #6
    Moderator OsideBill's Avatar
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    Several years ago when dealing with Art at Jet Works on some Black Jacks for my 99GP. He was having me do plug chops at different throttle settings 1/4 1/2 3/4 and wot. This helped tremendously to dial my carbs in throughout the power band.

    I had someone bring to light the other day the "notoriuos" 3/4 lean condition in the GPR's. I lost a cylinder here recently in this range. I will be checking this next time out. I had not heard about this before.

  7. #7
    Moderator OsideBill's Avatar
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    Quote Originally Posted by mrbtd View Post
    Great topic for a Monday morning

    I got this picture from here
    http://www.dansmc.com/Spark_Plugs/Sp...s_catalog.html

    Do you agree this is a good plug color ? I am going to do some chops today just to be sure but I think this is about me.

    Does the age/time on the spark plug matter ?
    mrbtd that is an awesome old post I converted it to a pdf and saved it. Thanks for digging that up.
    Attached Files Attached Files

  8. #8
    Moderator RX951's Avatar
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    this is very good information to discuss Forrest ! Thanks !

  9. #9
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    Quote Originally Posted by GPRPITMAN View Post
    Yes thankyou for posting up the chart and that plug is exactly what I am talking about I think alot of the guys are running in the #'s of the 22 to24 range which it says ok but lean and if your going out pinning that throttle for long distances I would be a little worried of lean sieze
    Yep!!!I was at the 22 range! YEP SURE WAS. Thanks again for putting up with me. I updated my post today on jetting.

  10. #10

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    Damn the plugs, how bout answering the PHONE!!!! SLOW AZZ

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