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09-10-2016, 09:06 AM | #1 |
Join Date: May 2016
Posts: 34
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How do I know if I'm running too lean or rich?
How do I know if I'm running too lean or rich? I just installed a new performance air filter, did away with the stock air box, and the engine actually sounds a lot different now, noticeably more air/exhaust is coming out of the exhaust now. How do I know if I need to upjet or adjust the carb?
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09-10-2016, 09:32 AM | #2 |
Join Date: Feb 2015
Posts: 257
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You are running too lean. You can tell from the color of the plug ceramic in the cylinder, or from a gas analyzer, or experience.
I have been piecing together a FrankenScoot 49cc for a scoot repair shop owner. It had many parts were originally sold off including the exhaust, air cleaner box, body panels, etc. He did not want to spend much money to get it sell able, so i was given a "performance cone air filter". That has become a nightmare to correctly tune. I have been able to get it to run great on sunshiny 80 degree days, but riding in the rain which you could get caught in- it won't get out of its own way! The reason is the air cools off in rain, thus more compact molecules-- thus more oxygen is pulled in and VIOLA it is running lean. |
09-10-2016, 09:46 AM | #3 | |
Join Date: May 2016
Posts: 34
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Quote:
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09-10-2016, 10:25 AM | #4 |
Join Date: Feb 2015
Posts: 257
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i have no idea 'where' the cone AF came from.
The ceramic color: original- white lean - white or almost white proper - tan rich - black a proper running engine will take an overly rich plug and clean it to tan within about 500 miles of driving. |
09-10-2016, 12:40 PM | #6 |
Join Date: Dec 2013
Location: Western New York
Posts: 454
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Took this photo a couple of years ago, this is the color you are looking for...http://scootdawg.net/picture.php?alb...&pictureid=550
By the way....with 10,887 miles on this plug, it is still in my scoot, and doing fine. |
09-11-2016, 08:10 AM | #7 |
Join Date: Jul 2008
Location: York PA
Posts: 339
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If it helps anyone,https://www.ngksparkplugs.com/about-...d-a-spark-plug
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09-12-2016, 10:05 AM | #8 |
Join Date: Mar 2010
Location: Houston area
Posts: 945
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If you determine that you are running rich, either up the main jet or reinstall the stock air box. Running lean will definitely shorten your engine life.
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"Beer never broke my heart" - Luke Combs |
09-13-2016, 05:48 AM | #9 |
Join Date: Dec 2013
Location: Western New York
Posts: 454
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The word rich in the post above, is wrong. It should be lean.
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09-14-2016, 08:20 AM | #10 |
Join Date: Mar 2010
Location: Houston area
Posts: 945
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Yup. I meant say lean.
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"Beer never broke my heart" - Luke Combs |
09-14-2016, 12:53 PM | #11 |
Join Date: Dec 2014
Posts: 738
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I'm not positive on this but I was told that when "reading" plugs on motorcycles , you run to full throttle & then shut the engine off & "read" the plugs! You NEVER let the engine return to idle because you will get a "false" reading. Irish
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