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| Spark Plug Color https://www.mudmotortalk.com/mmt_v2/viewtopic.php?f=2&t=7863 |
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| Author: | fowl habbit [ Tue Feb 16, 2010 3:44 pm ] |
| Post subject: | Spark Plug Color |
Just wondering how soon you should start seeing a change in color in the plugs Im running a 167.5 main jet I havent monkeyed with any of the other Jets. I put new plugs in a couple days ago only have about 1 hour run time on the plugs Its been mainly wide open. I pulled the plugs and they are still white. Just wondering if its cause I havent ran the motor long enough or if its running lean. The motor runs great but I dont want to hear the KABOOM i would rather run it a little rich then to lean |
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| Author: | squirrel [ Tue Feb 16, 2010 3:48 pm ] |
| Post subject: | Re: Spark Plug Color |
grayish tan to wite color is a good range of color. |
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| Author: | fowl habbit [ Tue Feb 16, 2010 3:55 pm ] |
| Post subject: | Re: Spark Plug Color |
| Author: | squirrel [ Tue Feb 16, 2010 5:58 pm ] |
| Post subject: | Re: Spark Plug Color |
run at wide open throttle for about 5 to 10 seconds shut it down and check it.if its white to light brown your fine. |
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| Author: | squirrel [ Tue Feb 16, 2010 6:18 pm ] |
| Post subject: | Re: Spark Plug Color |
and if all you changed is main jet that is the best way to check it. and 1 hour run time is plenty. |
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| Author: | bundy [ Tue Feb 16, 2010 6:46 pm ] |
| Post subject: | Re: Spark Plug Color |
| Author: | squirrel [ Tue Feb 16, 2010 6:51 pm ] |
| Post subject: | Re: Spark Plug Color |
bundy i answered the guys question . simple forum till you fuqed it up. like normal. haha nk nk later |
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| Author: | fowl habbit [ Tue Feb 16, 2010 7:41 pm ] |
| Post subject: | Re: Spark Plug Color |
Thanks for the tip I went and ran the motor and the porcilin part of the plug is still white which means to lean of mixture right. I put a 170 main jet in and it was to much you could tell the motor was getiing to much gas and almost choking itself out. So that being said what else could I adjust to get a richer mixture. By the way its the single Mikuni carb |
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| Author: | squirrel [ Tue Feb 16, 2010 9:06 pm ] |
| Post subject: | Re: Spark Plug Color |
no your original jet compared to plug color sounded fine. |
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| Author: | squirrel [ Tue Feb 16, 2010 9:11 pm ] |
| Post subject: | Re: Spark Plug Color |
Accurate Reading Conditions The most accurate plug readings are obtained after an engine is well tuned with new plugs and after shutting the engine at the end of a strong full throttle run. Having the engine shut down quickly and cleanly avoids creating misleading information and provides evidence from full power conditions. |
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| Author: | drake1 [ Wed Feb 17, 2010 6:44 am ] |
| Post subject: | Re: Spark Plug Color |
You really should cut the insulator off to view the plug that is otherwise missed from the naked eye. 165 to 167.5 with a 25 to 30 pilot is about where you should be depending on weather and load on the motor. |
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| Author: | fowl habbit [ Wed Feb 17, 2010 10:39 am ] |
| Post subject: | Re: Spark Plug Color |
Thanks guys I think I will cut into one I read that same thing somwhere on the Mud Buddy site that you cant always tell the color until you cut into one beacause todays plugs dont show exactly what color it iis. Thanks again for the help this site rocks |
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| Author: | Rail [ Thu Feb 18, 2010 9:50 pm ] |
| Post subject: | Re: Spark Plug Color |
Squirrel you should stop answering questions until you know the answers... lmao You DO NOT want white plugs.. Whoever said brown paperbag was pretty close.. Kinda like a mocha color.. It also takes longer than 5-10 seconds of run time.. Fire it up on the water and go run WFO for about 15 minutes.. Run fast enough to shut it down and be able to coast up to the dock or beach etc by shutting it off running at 3/4+ throttle. Let the motor cool and check your plugs.. If you want to get really cool get an exhaust sniffer and WEGO log program and you can really dial it in.. |
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| Author: | fowl habbit [ Fri Feb 19, 2010 5:23 pm ] |
| Post subject: | Re: Spark Plug Color |
tried that still running a little lean anythung else I can adjust a 170 main I know is to much I have a 167.5 in and moved the needle jet to richen it. What else is their to try |
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| Author: | bjg [ Fri Feb 19, 2010 10:47 pm ] |
| Post subject: | Re: Spark Plug Color |
| Author: | stumpgrinder [ Fri Feb 19, 2010 11:01 pm ] |
| Post subject: | Re: Spark Plug Color |
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