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15-08-2006, 08:31 PM
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#21
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Registered User
Country: England
Location: Plymouth
Boat make: Fletcher Arrowflyte
Engines: Mercury 75
Join Date: Nov 2004
Location: Plymouth
Posts: 402
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Had identical problem with my Merc 75. The fix was a new fuel line inc bulb & clip (engine end).
Not saying this is what's wrong with yours but they're cheap so probably a good place to start.
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15-08-2006, 09:42 PM
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#22
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Registered User
Country: United kingdom
Location: West Sussex
Occupation: Grease Monkey
Interests: Makin my boat faster!
Boat name: S.B Racing
Boat make: Ocke mannerfelt canopied B23 / Zapcat
Engines: Merc 200XS Gen 2 / Tohatsu 50
Cruising area: littlehampton/Southampton
Join Date: Jan 2005
Location: West Sussex
Posts: 2,656
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Re: Poorly mota
Quote:
Originally posted by The Docta
Hi All
Wondered if anyone might have any ideas why my motor is not performing as it should. Its a late 80's 200 hp v6 merc (carb). Just been serviced with new plugs and leads.
Compression check was fine on all cylinders but the motor is not running right. It ticks over fine in neutral and throttle response is very good also sounds fine when given plenty of gas in neutral.
In gear, however, throttle response is poor and it sounds rough when running at low revs / speeds (almost like its missing). Only reaching about 45 - 50 at WOT where as we are used to more like 55-60+ and it sounds like its not reving as high as it should (guage knackered so cant be precise).
Also boat stalled totally when running at flat out yesteday but then started up without any probs??.
I thought it could be fuel related and was gonna replace filter. We normally run 45:1 mix with quicksilver oil.
Any ideas or suggestions would be more than appreciated.
Cheers all - the doc
ps attached a pic of the poorly mota in question
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That looks like a 2.4 200 clamshell model? First thing i would do is strip and clean carbs! Sounds like your problem to me! If the engine cuts out after the engine has been held at full throttle for a period of time it normally points at stuck floats! A decent service would include a carb clean anyway!
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Class 3C Mono EPA National speed record holder 95.35 mph Avg!
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16-08-2006, 08:28 AM
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#23
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Registered User
Country: UK
Location: Coventry (but from Lee on Solent)
Occupation: Sales Director
Interests: My Boat of course
Boat make: Extreme 21
Engines: Merc V8
Cruising area: Solent
Join Date: Jul 2005
Location: Coventry (but from Lee on Solent)
Posts: 587
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Hi All and thanks for all the advice
Hi Scottyboy - spot on mate. Late 80's clamshell 2.4 200. Cracking mota when its running sweet. It wails like a banshee!!
The mota was serviced by fairweather marine in Fareham. The service schedule with them states carb tune but does not mention cleanup.
Is this something that I could do myself or should we take it back to them and ask them to do it??
Cheers - The doc
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The Docta
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16-08-2006, 07:19 PM
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#24
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Registered User
Country: UK
Location: Coventry (but from Lee on Solent)
Occupation: Sales Director
Interests: My Boat of course
Boat make: Extreme 21
Engines: Merc V8
Cruising area: Solent
Join Date: Jul 2005
Location: Coventry (but from Lee on Solent)
Posts: 587
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Hi All
Took cover off carbs this evening and pumped primer bulb whils engine not running to check for carb flooding. All seemed fine.
When she was fired up, however, we noticed that a fine mist of fuel was being spat out of the barrel of the bottom right carb. This was not noticible on any of the other carbs.
Does this suggest blockage in the right hand side of the bottom carb?? or float stuck open in fuel bowl??
Upon inspection, fuel line, primer bulb and tank breather all seemed fine!
Spoke to outboard mchanic at fairweather and he said £100+vat to strip down and clean the carbs. Does this sound reasonable.
Any thoughts or advice realy appreciated
Cheers all the doc
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The Docta
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16-08-2006, 07:32 PM
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#25
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Registered User
Country: uk
Location: brighton
Occupation: CABINET MAKER
Interests: SPEED BOATS,MOTO G.P
Boat name: MOTIVATION
Boat make: MARSHAN 21
Engines: AINT GOT ONE!!
Cruising area: sea
Join Date: Sep 2005
Location: brighton
Posts: 1,223
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Spoke to outboard mchanic at fairweather and he said £100+vat to strip down and clean the carbs. Does this sound reasonable.
no it doesnt!
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Taurus excreta cerebrum vincit
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17-08-2006, 08:26 AM
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#26
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Registered User
Country: England
Location: South West
Occupation: Development engineer
Interests: Fast boats
Boat name: Xtreme
Boat make: Bernico 21
Engines: Mercury F1, 300 Drag, XR2 "Fingerported"
Cruising area: South West
Join Date: Mar 2004
Location: South West
Posts: 1,043
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£100 to strip and clean the carbs on a V6 does not sound unresonable to me, its around 3 hours works to do it properly.
I would however question why they need doing again if it states that they were done in the service report, and ask what does it mean by setting up the carbs?
The only set up that is required is checking the butterflies are fully open at WOT and that the throttle arm returns to its stop on tick over.
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17-08-2006, 08:32 AM
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#27
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Quote:
Originally posted by The Docta
When she was fired up, however, we noticed that a fine mist of fuel was being spat out of the barrel of the bottom right carb. This was not noticible on any of the other carbs.
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I would be looking into distorted, damaged, or missing reeds if I saw that, on just one carb.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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17-08-2006, 10:29 AM
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#28
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Registered User
Country: UK
Location: Coventry (but from Lee on Solent)
Occupation: Sales Director
Interests: My Boat of course
Boat make: Extreme 21
Engines: Merc V8
Cruising area: Solent
Join Date: Jul 2005
Location: Coventry (but from Lee on Solent)
Posts: 587
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Hi John and thanks
Could an issue with the reeds cause the problem we are encountering i.e. not getting full revs / power and running rough at low revs whilst in gear but fine in neutral??
Mota is also very slow to pick up when in gear.
Cheers
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17-08-2006, 11:12 AM
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#29
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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It certainly wouldn't help.
I'd start with a pukka spark tester too, as seeing a spark at the 90 thou' permagap plug don't really mean jack shit, it aught'a be able to jump at least 1 inch in open air, then you know it aint breeaking down under compression. then move onto the carbs etc, once you know you have a spark capable of lighting it.
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17-08-2006, 11:30 AM
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#30
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Traveling
Country: UK
Location: Alderholt
Occupation: Aerospace
Boat name: T/T D2S
Boat make: Midas 27' Cat, Argo 16 Cat. Avon Rib Thingy
Engines: Merc 280-ROS -JSRE,65Xs, 75 Stinger, Yam 60
Cruising area: Any Seedy Bar
Join Date: Sep 2004
Location: Alderholt
Posts: 4,225
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It is impossible to lick your elbow.
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At least 75% of people who read this will try to lick their elbow!
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17-08-2006, 11:31 AM
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#31
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Traveling
Country: UK
Location: Alderholt
Occupation: Aerospace
Boat name: T/T D2S
Boat make: Midas 27' Cat, Argo 16 Cat. Avon Rib Thingy
Engines: Merc 280-ROS -JSRE,65Xs, 75 Stinger, Yam 60
Cruising area: Any Seedy Bar
Join Date: Sep 2004
Location: Alderholt
Posts: 4,225
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__________________
It is impossible to lick your elbow.
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At least 75% of people who read this will try to lick their elbow!
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17-08-2006, 12:52 PM
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#32
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Registered User
Country: UK
Location: Coventry (but from Lee on Solent)
Occupation: Sales Director
Interests: My Boat of course
Boat make: Extreme 21
Engines: Merc V8
Cruising area: Solent
Join Date: Jul 2005
Location: Coventry (but from Lee on Solent)
Posts: 587
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Cheers Blufin - Cheers Jon
Most appreciated
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The Docta
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