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Old 03 August 2022, 15:01   #1
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Suzuki DF140 wonít rev over 3600

Hi all, my usually reliable Suzuki let me down today.

Iíve had a mare of a year so this was the first time Iíve used her in 12 months. Started fine cruised fine, but when opening up to plane she just wonít go over 3600 revs and climb out of the hole.

Is it likely that my fuel has gone stale - 200 ltr full tank, or do they suffer from other issues such as a faulty mass air flow sensor etc.?
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Old 03 August 2022, 15:33   #2
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Originally Posted by Striker View Post
Hi all, my usually reliable Suzuki let me down today.

Iíve had a mare of a year so this was the first time Iíve used her in 12 months. Started fine cruised fine, but when opening up to plane she just wonít go over 3600 revs and climb out of the hole.

Is it likely that my fuel has gone stale - 200 ltr full tank, or do they suffer from other issues such as a faulty mass air flow sensor etc.?


Any faults on the gauges?
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Old 03 August 2022, 15:55   #3
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Any faults on the gauges?
To be honest, Iím sat here now trying to find a user manual for the gauges to see how to access any codes.

Itís the round mf display ( I believe a Suzuki badged Lawrence) that uses the interface cable.

Iíve just read elsewhere that a low crank voltage can cause the interface to throw up an issue that causes a safe mode to be triggered. - it was a bit sluggish on cranking to be fair. But at least I can disconnect the interface and start without that to rule it out.
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Old 03 August 2022, 16:57   #4
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To be honest, Iím sat here now trying to find a user manual for the gauges to see how to access any codes.



Itís the round mf display ( I believe a Suzuki badged Lawrence) that uses the interface cable.



Iíve just read elsewhere that a low crank voltage can cause the interface to throw up an issue that causes a safe mode to be triggered. - it was a bit sluggish on cranking to be fair. But at least I can disconnect the interface and start without that to rule it out.


Whereabouts in the country are you?
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Old 03 August 2022, 17:08   #5
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No experience of Suzuki (apart from motorcycles) but in 50+ years of bikes, cars, and boats I've never had a problem with 'bad' fuel. If it is bad fuel I wouldn't expect it to run properly at any revs. In fact I would say it would be the opposite ie. running rough at low revs and improving as the revs rise. JMTPW and I'm sure someone with more experience than me will be along shortly to help
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Old 03 August 2022, 17:24   #6
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Suzuki DF140 wonít rev over 3600

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Whereabouts in the country are you?


Hi Dave, the boatís in a yard on the Menai Straights. Typically, we have rented a Holliday cottage for a week to try to get some use out of her, but aside from this she is also loosing air from the rear most section of tube (over 24 hours). But Iíve just popped back down to see if I can get a code from the instruments and found that that rear section of tube is leaking water!?! Is somehow open up a seam on the rubbing strip (where itís been linked with the tube flat) and whilst underway managed to force water in. FFS boats heyÖ who would have them.
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Old 03 August 2022, 19:33   #7
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That may well be the reason it wonít rev
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Old 03 August 2022, 19:44   #8
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That may well be the reason it wonít rev


That did cross my mind. The tube extends beyond the outboard which puts the weight well back trying to get on plane.

She was burning 25 ltrs per hour of fuel WOT at 3600 RPM so no issue with fuel delivery and it was like it just needed a push to get it over the bow wave.

Either way the tube repair is my new priority and I can worry about the motor once thatís fixed.
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Old 04 August 2022, 08:23   #9
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Have you checked the hull isnít full of water?
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Old 04 August 2022, 12:15   #10
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Have you checked the hull isnít full of water?


Yes. I keep her on a trailer with the pug out and only put it in on the slipway as the angle gets that last bit out.

The tube was rather full of water as it has opened up on a seam where the rubbing strip is glued and the forward motion has forced water past the seam despite the tube remaining inflated.

Itís probably this additional weight that stopped her getting on plane.
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Old 04 August 2022, 12:50   #11
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Yes. I keep her on a trailer with the pug out and only put it in on the slipway as the angle gets that last bit out.

The tube was rather full of water as it has opened up on a seam where the rubbing strip is glued and the forward motion has forced water past the seam despite the tube remaining inflated.

Itís probably this additional weight that stopped her getting on plane.
Think PD is referring to the inboard plug ! the inner hull area fills thru the trunking in /out
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Old 04 August 2022, 14:13   #12
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Think PD is referring to the inboard plug ! the inner hull area fills thru the trunking in /out


It doesnít have one, the interior of the hull is accessible from the rear bench seat which gives access to the batteries and shower pump etc. Itís a super yacht tender layout with moulded bench seats rather than jockey seats. And I can see the inner side of the hull which drains via the only plug in the transom. There are also two bilge pumps but Iíve never had enough water in there to trigger the float switch.
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