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"if its a 2 stroke yes

if its a 4 stroke no "

This is not competely accurate. Some of Yamaha's 2 stroke bikes have a separate reservoir under the seat for the 2 stroke oil and the bike then mixes the gas and oil and the correct proportions while riding so that the user doesn't have to deal with measuring and mixing. These bikes have a sight glass on the left side of the bike in the plastic cover/shield through which to observe the oil level. This is a *separate* oil system from the normal engine lubricant oil which has the plug on the engine case on the bottom right side of the engine. Simply fill the reservoir under the seat with 2 stroke oil, the gas tank with gas, and off you go. Not having had one of these bikes, I strongly suspect that you can put enough two stroke oil in the seat reservoir to cover multiple tanks of gas, as the seat has to be unbolted and taken off each and every time you have to fill it.

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12y ago
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15y ago

no it takes regular unleaded gas

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Q: Do you need to mix gas and oil for a Yamaha 90 dirt bike?
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