![]() Outer metal plug ring = clean with no build up and lite color, black is rich on pilot. Porcelain = at least 75 % of it lite to medium tan.Įlectrode = will hopefully follow the porcelain color and also have no deposits. My method is the same used by the Kawi factory MX racing team and most other professionals I know which in general is the following: PLUG COLOR - In the interest of avoiding possible plug reading bedlum I suggest you simply use the chart in the link at the bottom of my post as a guide. ![]() Check plug and do further jetting according to my plug color. PLUG CHOP In your particular case ONLY, I would jet as I suggested then install a new plug, ride it moderately from all rpm’s for 15 minutes then inspect plug, if it's nearly white jet up 1 more size ride for 15 minutes then run at WOT in 5th gear up a slight grade if possible for 3-4 seconds, then kill eng and quickly pull clutch lever in. It is safer to start rich then jet leaner. Plus if your cylinder is not port dimensions are not the same as yamaho225dr, your jet sizes my need to be different than his anyway. Since your carb is not orig I would start with 3 sizes larger on the main and 1 on the pilot jet. anyone know where to get a 147 main jet for it? or are they universal for 2 stroke carbs? ![]() Im probably going to buy a full fmf exhaust system and i was wondering what jet i should upgrade to, the stock one is 142, im probably going to remove the airbox tooits not the stock carb, it says OEM STD on the side.
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