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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
yz490j
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[QUOTE="2strokerfun, post: 1431768, member: 69719"] transmission/clutch oil, or premix? Either way you'll get a hundred answers. For transmission, just use any quality lubricant (I like 20w/50 motor oil). For gas, just use any quality premix oil and stay with the same ratio (32:1 is often a good start) until you get it jetted and running as best you can. The 490 is notorious for detonation or running rich (i.e. hard to jet for consistent running in varying conditions/temperatures) unless you've had the squish band reworked on the head. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
yz490j
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