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Old 28 November 2004, 14:51   #1
Country: UK - England
Town: Christchurch
Boat name: Sha-my-sha-my
Make: Valiant
Length: 4m +
Join Date: May 2004
Posts: 167
Suzuki DF140 problems

Well, it didn't take long for a problem to occur

We recently purchased a Ribtec 585 with a Suzuki DF140 motor.

We launched (for the first time!) at Mudeford on Saturday. Lovely weather in the morning, and the sea was very calm. It took a while to start, but it seemed to work much better once I'd plugged the kill-switch in

Our first impressions were that the engine was very quiet and the sea was too flat for any real hull testing But for some reason it wouldn't rev past 5000. It felt fine and picked up very nicely at every speed under 5000. I thought it might have been throttle cable slipping somehow, and didn't worry too much more about it. After that however, every time we depowered and repowered, the maximum revs achieved dropped by about 500rpm a time! It felt very much like a slipping cable, so we turned back straight away. By the time we were back at Christchurch she was only revving to 2000rpm - we couldn't even got up on a plane! Intererestingly, if I increased the throttle quickly, it would cut straight down, but I was able to tease the revs up by moving the throttle very gently - this all pointed to a slipping cable.

When we got it home, I connected the flush muffs and it revved just fine - but then it wasn't under any load. I found the throttle under the hood and it looks like the controls *were* in fact fully opening the throttle. Either that, or somehow it had started working again on the way home.

No engine faults showed up at any point. If it was a fuel supply problem, I'm guessing the lambda sensor would read lean and throw up a fault?

Any ideas what might cause this? I'm going to get on the phone tomorrow, as it should still be under warranty - but the original supplying dealer is hundreds of miles away, it if it's something obvious I'd like to have a crack at it myself!

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Old 28 November 2004, 15:08   #2
Country: UK - England
Town: Dorset
Length: 4m +
Join Date: Oct 2003
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I may be way off here but my mates 'rude 90 Etec's controls were rubbing on the cowling and they tended to stick. On an engine like that its more likely to be a mechanical fault than anything else.

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Old 28 November 2004, 15:45   #3
Country: UK - Scotland
Length: 10m +
Engine: 2x610hp jets
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Posts: 74
it sounds more like shortage of fuel hence the reason for running fine when not under load,or poss drawing air from somewhere.had same problem on yam 85 years ago.
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Old 28 November 2004, 16:09   #4
Country: UK - England
Town: Helston, Cornwall
Boat name: Silver Fern
Make: Rayglass Protector
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Engine: 2 x 250hp Verado
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Originally Posted by tonka
had same problem on yam 85 years ago.
Wow, thats a long time

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Old 28 November 2004, 16:37   #5
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Country: Other
Town: Principalite d'Chaos
Boat name: The Nashers Revenge!
Make: Ocean & Bombard
Length: 6m +
Engine: Suzi DT200EFI, DT9.9
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Sounds like fuel to me too.

Had the boat/engine been laid up for a while? and have you checked the fuel filter for Cr*p, or water if it has a seperator? Moving the Boat around after a lay-up may have disturbed some silt etc in the tank or there may have been a build up of condensation.

Its a shame that your first trip out was ruined.


PS - Have to agree 85 years is a long time ago to have been running a Yam. Japs must have invented Outboards afterall.
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Old 29 November 2004, 03:48   #6
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Town: Salcombe, Devon, UK
Boat name: BananaShark
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Engine: 2xYanmar 260 diesels
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Have a look at the bush in the prop as well - you never know!
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Old 29 November 2004, 14:29   #7
Country: UK - England
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Boat name: Obsession
Length: 6m +
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Posts: 390
I would have a look at the breather on the fuel tank to see if it is working properly. A good way of testing it when the problem is there is release the fuel filler cap and see if the revs pickup. If it is that it could damage the tank if not sorted.
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Old 29 November 2004, 19:12   #8
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Country: UK - England
Town: Fareham
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You say you forgot to fit the kill cord, so is it percevable that you also forgot the vent screw on top of the fuel tank as well, it happens!!
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Old 30 November 2004, 02:13   #9
Country: UK - Wales
Town: Pwllheli-North Wales
Boat name: Delta 1
Make: Delta
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Engine: Mariner 90hp Optimax
Join Date: Mar 2001
Posts: 2,367
I would also suggest fuel shortage. Could be the inner of the fuel pipe breaking down. When your going along get someone to prime the fuel primer and see if it is any better, also look at whats happening to the fuel primer, is it hard, soft or clapsed. Fuel primers are often the first thing to go on a fuel system, is it cracked anywhere?

The problem is probably alot more simple than you think.
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Old 30 November 2004, 03:04   #10
Country: UK - England
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Length: 8m +
Engine: GM Diesels
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Originally Posted by Cookee
Have a look at the bush in the prop as well - you never know!

Prop bush sliping, causing the revs to die! I wouldn't think so.

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