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Yacht engine - Low Revs

Hi
I have a 19hp inboard volvo penta with a prop shaft in my Jeanneau yacht.
2 Years ago we hit a large clump of seaweed which immeadiatly caused it to lose power. We had the propeller changed and although it runs much better we still can't get the revs in gear to go over 2,000 rpm, where I'm pretty sure it went to 3,000 + before.
I've canged the fuel because it was pretty old, but still the same.
The engine was serviced about a year ago and has only done 2 or 3 hours since, in fact I reckon the engine has only done about 300 hours since new in 2001 (we are very close to the sea).
Unfortunalty, because I can only get to the boat every few months and it's in France it's hard to get the local mecahnic to understand the problem as our English and French doesn't run to technical stuff.
Hope someone has some ideas - sorry for the post droning on a bit !
Thanks
Andy
 
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