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The 1990 Kawasaki 650 TS uses an oil injection system that injects oil directly into the intake manifold just under the carburetor. The oil tank for this oil injection system is all the way to the rear of the engine bay - it is the only tank back there, bolted right on top of the waterbox. If there is no tank on top of the waterbox, you should see 4 threaded bolt-holes where tank used to be - in this case, the JetSki has probably been modified to run a pre-mixed oil and gas mixture - if this is the case, you add 2-stroke oil directly to the gasoline. If stock, I would recommend a 40:1 ratio. If you're unsure, find a friendly JetSki mechanic and offer him or her a few bucks for advice.

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11y ago
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Q: How do you add oil to a 1990 kawasaki ts 650 jet ski?
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