Knotty Posted February 25, 2008 Share Posted February 25, 2008 could someone please tell be the oill type and fuel mixture for an 87 yz250 Link to comment Share on other sites More sharing options...
PioneerX Posted February 26, 2008 Share Posted February 26, 2008 although not familer with the bike myself and not having a manual that old for it I did some surfing for the answer. The ratios are from 32:1 -> 40:1 -> 50:1 with the popular choice @ 40:1. Going on pure 2-stroke theory (yes I was a mechanic) too much oil will cause rough running and foiling of the plug and baffle. Too little oil will cause extra engine wear and overheating (yes the oil does produce a cooling effect on the engine). If you cant get a definative answer then I would go with 40:1 and keep an eye on engine performance (power will fade if overheating) and the state of the plug (or oil dripping from the exhaust). Link to comment Share on other sites More sharing options...
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