Jet ski revs up to 7K rpm, but will not accelerate past 12 mph when first started

Finewine033

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Jul 10, 2015
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After about 10 minutes, it will then accelerate up to about 33 mph. It will accelerate fine after being stopped, but if it is turned off for an hour, it is very slow to accelerate and again won't go faster than 12 mph for about 10 minutes.
 
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