Author Topic: grey plug tip  (Read 1666 times)

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Offline bilger69

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grey plug tip
« on: March 26, 2012, 02:45:00 PM »
1999 kx500 stock carb, 1500ft elevation, 58 pilot, 168 main, air screw half out. Bpr8es ngk plug. 93 octane pump gas bel ray h1r synthetic oil mixed 40:1. Vforce 3 seeds uni filter fmf gnarly header fmf powercore silencer.  86 flywheel and stator. Stock bore wiseco window piston. ...... I just put in my new window piston and top end kit. Been doin the break in procedures yesterday and today. I checked the plug after every run once cooled. Always tannish brown as always was before rebuild. But today the tip was grey after a run. Although today was 47 degrees which i should have probably had a 170 main in according to the chart on here but lean is white grey is hot right?? Thanks

Offline bilger69

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Re: grey plug tip
« Reply #1 on: March 29, 2012, 01:51:51 AM »
Nevermind on that question I got it sorted ... New question if I.switch to 110 octane Sunoco race gas do I need to change my jetting

Offline dieselbeef

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Re: grey plug tip
« Reply #2 on: April 13, 2012, 03:47:35 AM »
when i got from vp to cam 2 it runs like crap