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Old 07 October 2005, 05:31   #11
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Country: Other
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Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
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I have a similar problem on my engine which I hope to solve today.

I think its dirt in the fuel. The engine fuel filter is very dirty and their is some sand like material in the bottom of the bowl.

I am going to replace the engine filter, fit a new in line filter, clean the tank filter/pick up and clean the bowl.

I'm hoping that will sort it.

Maybe that might help you..........
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Old 07 October 2005, 06:12   #12
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Country: UK - England
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Boat name: Escapism
Make: Narwhal
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Engine: Yamaha 55
Join Date: Jun 2004
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Quote:
Originally Posted by Biggles
I have a similar problem on my engine which I hope to solve today.

I think its dirt in the fuel. The engine fuel filter is very dirty and their is some sand like material in the bottom of the bowl.

I am going to replace the engine filter, fit a new in line filter, clean the tank filter/pick up and clean the bowl.

I'm hoping that will sort it.

Maybe that might help you..........
Thanks biggles, I allready threw out my old fuel, cleaned the tank and filters and changed the fuel pipes!!!
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Old 07 October 2005, 11:47   #13
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Now I know the answer!!!

Just took the head off to de-coke and found that the liner in the top cylinder has rotated by about 10 degrees, half closing all the ports!

Has anyone seen this happen before?

And more importantly does anyone know how to put it right?!

Thanks very much to all those who have allready offered advice, its very apparent at times like this that there’s a fair bit of knowledge to be found on these pages.
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Old 08 October 2005, 05:05   #14
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Craig, thanks for the feedback and for passing on what the problem was

For info, I have never heard of the liner moving in this fashion. No wonder you were having problems

How did the cylinders look when you got inside? Was there a lot of carbon build-up?
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Old 08 October 2005, 14:43   #15
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There was a post on iboats about this sort of thing.

It was a smaller engine and the guy had to put the block in his oven, sent the wife out obviously, and then managed to twist it back.

Do a search of www.iboats.com and see what comes up.

Regards Nick R.
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Old 26 October 2005, 15:35   #16
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Town: Hoylake,Wirral
Boat name: Deerider and Beast
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Engine: Outboards
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Quote:
Originally Posted by Craig H
As you might have noticed from my previous post "worth repairing?" my Yamaha 55 suffered a terminal fault recently. I did however manage to find another 55 on Ebay with a knackered gearbox for £100 and swapped the powerheads over.

I've set the timing, overhauled the carbs, fitted new plugs, checked the compression (both cyinders in the 140-145psi) etc etc.

Both plugs are the perfect tan colour so the mixtures right but it just hasnt got as much power my old 55 had. It doesnt accelerate as well and is about 5kts down on top speed. Top engine speed is now 4900rpm not 5500rpm as it used to be.

Is there something I'm missing? I'm sure they never came out of the factory with so much variation in output.

Anyone got any suggestions?
Have you drained the gearbox since running the new engine to make sure it is not metallicy it could be the box braking down and causing poor excelleration and top end speed (unlikely but desprate times and all). otherwise it sounds like a fuel problem have you tried changing the carbs over from the dead engine.
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