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Suzuki 60s Surging above idle

Dan T asked on 6/13/2019 2:07:22 PM
I have twin Suzuki 60s with under 50 hours on each and each running from its own fuel tank. After trailering the boat 500 miles, put it in the water. Both 60s start and idle normally. When throttle up in neutral, both engines surge in RPMs, then drop back - surge, then drop back without changing the position of the throttles. Any ideas?

 

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