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It's a Yamaha so it'll call for yamalube but I have one just like it and I use Honda tranny oil and I have no problems with it and its about $3 cheaper but it root depends on how aggressive u r on it me I drive mine like its a 4 stroke and have had the same plug for 13 years but if u want it to stay all factory I recommend using yamalube Yamaha designs the bike so they no exactly what is the best for it so it'll b dependable at last

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12y ago
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Q: What type of oil do you use in a 1982 Yamaha YZ490?
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