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| spark plugs lean or rich? http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=20214 |
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| Author: | Pluck IT [ Thu Jul 21, 2011 9:00 am ] |
| Post subject: | spark plugs lean or rich? |
I got a MM exhaust and mikuni. I been running it for a few months so I checked my plugs today to see if I was running rich or lean and one plug is black while the other looks light brown or tan (nice). Im running a 167.5 jet thinking about go down to a 165. What do you vets think about it?? its on a Prodrive with denso iridium plugs. |
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| Author: | fowl habbit [ Thu Jul 21, 2011 9:04 am ] |
| Post subject: | Re: spark plugs lean or rich? |
Keep it where it is. One cylinder will always run a little leaner then the other. I have the mikuni on mine and many other mods and also run the 167.5.. You could try a 165 but its better IMO to run it a little rich then lean. You dont want one side to be paper bag brown color and the other side almost white. I think where you have it should be fine |
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| Author: | Pluck IT [ Thu Jul 21, 2011 4:19 pm ] |
| Post subject: | Re: spark plugs lean or rich? |
thanks much fowl. I my self prefer and feel safer running a lil bit rich then running lean. |
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| Author: | deadbird8 [ Thu Jul 21, 2011 6:54 pm ] |
| Post subject: | Re: spark plugs lean or rich? |
You check plug color by warming up, installing new plugs, and running (no idle) for about 2 miles and then immediately kill it (pull kill switch- no idle). Then pull and check the ring at the base of the insulator. Pulling them after you have run them and idled is not telling you anything. |
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| Author: | russellm454 [ Thu Jul 21, 2011 8:51 pm ] |
| Post subject: | Re: spark plugs lean or rich? |
DB8 is correct running a motor for a long time and pulling the plugs is not the proper way to read plugs. As he says warm it up. Throw a new set of plugs in run it full throttle for a couple miles kill it on plane with no idle, pull the plugs and read them. Take 6 - 8 plugs and different jets with you if you want to tune it to the optimum. Russ |
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| Author: | Pluck IT [ Fri Jul 22, 2011 5:53 am ] |
| Post subject: | Re: spark plugs lean or rich? |
ok I will have to get some more plugs and I willl get back with yall. |
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| Author: | deadbird8 [ Sat Jul 23, 2011 9:26 am ] |
| Post subject: | Re: spark plugs lean or rich? |
Looking for this: |
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| Author: | Gros'bec [ Mon Jul 25, 2011 11:34 am ] |
| Post subject: | Re: spark plugs lean or rich? |
What determines if you need a colder or hotter plug. I'm running NGK cs6 plugs on a stock 35. Plugs have a little black but they are not all fouled up either. |
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