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What do the sparkplugs look like? If you are sucking oil, one should be oil fouled, if that cylinder is also detonating, the insulator may very well be cracked too. Burning oil will cause detonation problems, it isn't a very good fuel, and it causes carbon buildup which causes detonation.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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