Modifications effecting mix ratio?

tombenn444

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Dec 26, 2021
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So I've port and polished my yd 80 and slightly skirted the piston. Would this cause it to need more oil?
 
That's what I'm running. Problem is, my plug looks dry and burnt every time I check it. Just what kind of conditions should it be in order to have an accurate reading? Idle? Should I gun it before checking it? Tried three different tanks of gas, three different octanes and the results the same. I add oil to the mix by the capful until I check the plug and it eventually shows a little oil on it. But seems like I can't achieve the Goldilocks ratio. Just goes from bone dry to sopping wet.
 
Pretty sure that's an air / fuel adjustment.

The chart below will let you compare your plug and decide if you need more fuel or air. Sounds like you need more fuel.

 
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