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High rpm in neutral only after cruising at 3,000 or above

Scam426

New member
I’m having an issue with my twin crusaders on my Tiara 31. When boat gets to cruising speed (about 3100 rpms) and stays there for a few minutes while transmission is in forward rpms are good, when throttles are brought back down to idle speed and transmission is still in forward rpms go back down to around 1,000. As soon as transmission is put back into neutral the rpms rev up to around 2,000 and don’t come down unless I turn the engine off and back on. When turned back on the rpms stay around 800-1,000 in and out of forward and reverse. Only acts up when rpms go above 3,000 while in gear. Had the mechanic look at it and the carburetors are working fine and the throttle cables are good also. Weird that it’s happening to both engines at the same time. Any ideas?
 
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