Loss of revs

Went out on saturday and while running along I noticed something on my boat.  I was only getting 4800rpm WOT.  When I bought the boat new in January I had it in a river near the gold coast at 5600rpm WOT.  I know at the time I didnt have my fishing gear with me and Ive added 2 deep cycle batteries into the center console since then but I wouldnt think that I would lose 800rpm just like that.  No change in prop, nothing.

Spoke to a mate this morning who told me to clean the fuel filter out which Ive done this morning.  Hands still smell of petrol.  Its one of the water separator/filter canisters so thats all done.  There was a few jellyfish and rock crabs floating in the fuel out of it so fingers crossed the fuel flow was restricted and thats it.

Any other ideas as to what my rpm loss could be from?  I wont get to test the boat out until wednesday or so to see if this was it.

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Fish for thrills....


Posts: 563

Date Joined: 27/08/09

Stale fuel?

Mon, 2012-10-22 12:41

Stale fuel?

Brad Y's picture

Posts: 260

Date Joined: 03/02/12

Want to hope not, I usually

Mon, 2012-10-22 12:53

Want to hope not, I usually put fuel in it every second week or so!  None of the gull crap either, just shell or caltex.

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Fish for thrills....

mr_meks's picture

Posts: 189

Date Joined: 11/02/11

Am I reading this correctly,

Mon, 2012-10-22 14:26

Am I reading this correctly, you are gettiing crabs and jellyfish in your fuel tank !?!

Brad Y's picture

Posts: 260

Date Joined: 03/02/12

Just names for the floaties

Mon, 2012-10-22 15:30

Just names for the floaties I found in the bottom of the fuel filter bowl.

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Fish for thrills....

Reefmonkey's picture

Posts: 711

Date Joined: 22/09/08

What motor?

Mon, 2012-10-22 20:05

If its a 4-6cylinder 800rpm could be a dead spark plug

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 Dave J.

Brad Y's picture

Posts: 260

Date Joined: 03/02/12

No its a 90hp 3 cyl etec. 

Mon, 2012-10-22 21:04

No its a 90hp 3 cyl etec.  Definitely not a dead spark plug. 

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Fish for thrills....