What is the fuel oil mixture for a 1987 Yz490?

This is a trick question in that the correct fuel to oil mixture is not dependant upon the type of motorcycle. It IS dependant on the type of oil itself ... which is to say it's lubricating capability and other properties. To achieve the proper ratio, one should always follow the recommendations and specifications put out by the oil manufac turer. For most of the new highly-concentrated synthetic pre-mix oils, that ratio is typically around 40:1. But, can go as high as 50:1 for some brands. If your style of riding, track and weather conditions, etc., lead to abnormally high engine teperatures or, if you particular motor tends to run unusually warm, it's best to err on the conservative side and mix at a slightly lower ratio than the manufacturer recommends. Never mix at a ratio that is higher than recommended. MrGlock2 group founder/moderator Yahoo.com YZ490 Yahoo.com/group/YZ490">http://groups.Yahoo.com/group/YZ490