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Yamaha MX & Off-Road Dirt Bikes
correct or suggested oil mixture for 76 yamaha it400
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[QUOTE="jholtman, post: 1365461, member: 109750"] Back in the day (1970's) the 2 stroke oils were either petrol or castor based oils and required 20:1 ratios. Today, the oils are synthetic and are way better than the old oils. Many people have problems understanding what I am about to explain. If you take a 2 stroke that is jetted for 32:1 and decide to be "safe" and run the ratio at 20:1, you have just LEANED out the fuel mixture and you are headed for a HEAT SEIZURE. Conversly, if you take a vintage bike that is jetted for 20:1 and change to 32:1 you are now running RICH on fuel. Both 20:1 and 32:1 are acceptable ratios but I think that 20:1 is not needed with todays oils. Unless you fail to use any oil at all, most engine failures are caused by lean fuel mixtures, not lack of oil. A side note to this is that the old oils actually burned in the cyl (oil burns hotter than gas) whereas synthetics pass though for the most part unburned. The bottom line is: what ever ratio you run, you must jet (both main and idle jets) for the proper mixture or you may lose an engine or foul plugs. I have been running motocross engines since 1971 up to the new rage of the 4 strokes and once I learned this concept, I never lost an engine and always made good clean power. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
correct or suggested oil mixture for 76 yamaha it400
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