new boater help

[NEWONT-BOATER]

Can anybody help?<br />I recently purchased a boat 15'5" fiberglass bowrider with a 55HP Nissan motor on it. I clunks into gear. I lowered th idle but it still clunks. What could it be. Also the RPM's never get over 1600-1800, so I will probably never get close to 55HP, what do I need to do?

 

[corm]

Re: new boater help

Hi Newont-Boater,<br />If you have a stainless steel prop the engine will clunk when you shift it.<br /><br />Is the tach reading right? How fast are you going? At that rpm the boat may not even plane out. Is it running on both cyls. Good <br />compression/ Clean carbs.<br />...corm...

 

[NEWONT-BOATER]

Re: new boater help

Thanks Corm for replying, <br /><br />The fastest I've had the boat is 31 mph(2 adults) with the tach reading 1800 rpm. Pulling a skier I can only go about 27-29 mph (with a spotter). If I have more than 4 adults in the boat, I'm lucky if the boat will do 10 mph, even though the boat is rated for 7 adults (mind you it also allows a 75HP motor)<br /><br />The idle right now reads 400 rpm, and if I were to lower it, the motor sounds like it would stall. Maybe just needs a tune-up. I have an aluminum prop. Would a different prop make a big difference? I also have fins on the motor to help pull out skiers. <br />Would that have any impact on speed.

 

[monty]

Re: new boater help

Originally posted by NEWONT-BOATER:<br />Can anybody help?<br />I recently purchased a boat 15'5" fiberglass bowrider with a 55HP Nissan motor on it. I clunks into gear. I lowered th idle but it still clunks. What could it be. Also the RPM's never get over 1600-1800, so I will probably never get close to 55HP, what do I need to do?<br />hey new the "clunk" has nothing at all to do with a stainless prop you may have play in the lower unit we have to remember that the prev. owner may not have taken very good care of the motor i am not very familiar w/ nissans but try to talk to somebody else and or listen to theirs. good luck also check my reply to one of your earlier posts about prop pitch monty<br />

 

[monty]

Re: new boater help

the earlier reply is in the boat forum

 

[ross_larter]

Re: new boater help

If you can get 31mph from a 60hp at 1800 rpm , i what one! Think of the speed you will get at 5500rpm, it sound like your rev counter is on the wrong setting to me.