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Constant PARTIAL loss of throttle 90HP 2 stroke yamaha

Boatproblems

New member
Engine was going full throttle completely fine till semi-concering sounds, slow down to a crawl then unable to speed back up past say 1/3 of previous top speed, manual throttle works fine in nuetral and gives high revs, however when in forward the engine does not achieve anywhere near as high revs and goes at a fraction of what was previously full throttle.

Engine was serviced less than 50 miles ago.

Greatly appreciate any help and will try respond ASAP to any questions,

Cheers
 
Rpms in neutral are of no value here, just fyi. What does "serviced" mean exactly?...Pull carbs and jets? If not, that's where I'd start.
 
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