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Yamaha MX & Off-Road Dirt Bikes
Need help reading four stroke plug
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[QUOTE="fire escape, post: 121723, member: 21610"] I need some help reading four stroke plugs. I've owned and successfully jetted many two-strokes but I'm having a hard time with the condition if my yz250f plug.Just installed a DRD exhaust-85F temp,high humidity ( FL ) bike ran great,just like stock. I have left stock jetting in ( airscrew 1.5 out from factory ) and the bike has always started easy and runs great. When I checked the plug I can't tell if it is a little lean or a little rich.There is no tan color at all on the plug-the tip of the insulator is white,from the tip down is black-the electrode looks the same-tip is clean,rest is black.rest of inside of plug is black. It doesn't exhibit any bad performance characteristics except it sounds a little fat at the bottom. I probably don't rev it like a typical 125 pilot ( I have yet to hear the rev limiter ) so the fatness is probably OE. I have just heard that white plug=lean=boom and I wanted to pick some experienced four stroke brains.Thanks- [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Need help reading four stroke plug
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