Boatmad.com


Reply
 
Thread Tools Display Modes
 
Old 15-09-2016, 05:15 PM   #1
Registered User
 

Join Date: Sep 2016
Posts: 7
Engine problems

Hi,
I wonder if anyone could help me please,
I have 2 x yamaha f50 2005 engines (with 350 hours on each), with intermittent problems, some times they re a pain to start, sometimes ok, when started and up to temperature if you stop momentarily then put them back in gear one or both will stall, sometimes when coming to the jetty and you go to put them into reverse one or both will stall, when moving with any amount of throttle at any speed they are running perfect, both had new plugs, oil etc
Any ideas welcome
Thanks
Leighton
__________________

leightonkeay@yahoo.co.uk is offline   Reply With Quote
Old 15-09-2016, 10:36 PM   #2
Mike Mills
 
Red dragon's Avatar
 
Country: Uk
Location: Walney island
Occupation: Telecom Engineer
Interests: Powerboats, Fishing, Shooting, Modified cars
Boat name: VANISHING POINT
Boat make: Phantom 21 racedeck
Engines: MERC 2.4 EFI 320hp, MERC 2.4 EFI Bridgeport x2, 2.4 ported EFI
Cruising area: Walney coast (North west)

Join Date: Sep 2014
Location: Walney island
Posts: 660
Quote:
Originally Posted by leightonkeay@yahoo.co.uk View Post
Hi,
I wonder if anyone could help me please,
I have 2 x yamaha f50 2005 engines (with 350 hours on each), with intermittent problems, some times they re a pain to start, sometimes ok, when started and up to temperature if you stop momentarily then put them back in gear one or both will stall, sometimes when coming to the jetty and you go to put them into reverse one or both will stall, when moving with any amount of throttle at any speed they are running perfect, both had new plugs, oil etc
Any ideas welcome
Thanks
Leighton
Fuel lines as both to have the same symptoms is unlikely.

Do they run to the same tank?

If so.. There's where to start

Mike
__________________

__________________
Bring your boats up North
Piel island poker run 2017
all welcome
Red dragon is offline   Reply With Quote
Old 15-09-2016, 10:51 PM   #3
Registered User
 

Join Date: Sep 2016
Posts: 7
They are running separate tanks, problem is not there when going , just tick over or going from fwd to neutral to reverse or vice, will check/change the fuel lines though , thanks
leightonkeay@yahoo.co.uk is offline   Reply With Quote
Old 16-09-2016, 10:53 AM   #4
Registered User
 
Silversurfer's Avatar
 
Country: UK
Location: Thorpe Bay
Occupation: IT Director, www.lighthouseit.co.uk
Interests: Boats, Surfing & Snowboarding
Boat name: Isabella / Cool Runnings II / Bella / Sea Pup / Sea Dog / Speedy II / Bernico F3
Boat make: Colvic 35 Suncruiser / Bernico F3 / Phantom 16 / Zodiac 420 YL / RIB / Apollo 9
Engines: 2 x Perkins Sabre 225ti / Mercury Pro XS /Mercury Pro XS 115/ Tohatsu 2.5 / Mercury 25 / Mercury 50
Cruising area: Thames Estuary / River Crouch / Salcombe

Join Date: Jun 2004
Location: Thorpe Bay
Posts: 932
Are they carb motors?
__________________
Loving the Spitfire with a 25HP Mercury
Silversurfer is offline   Reply With Quote
Old 16-09-2016, 10:55 AM   #5
Registered User
 

Join Date: Sep 2016
Posts: 7
Quote:
Originally Posted by Silversurfer View Post
Are they carb motors?
Hi, yes they are carbs
leightonkeay@yahoo.co.uk is offline   Reply With Quote
Old 16-09-2016, 11:43 AM   #6
Registered User
 
Campion 165(seb)'s Avatar
 
Country: Denmark
Location: The Island Fyn
Occupation: Worker
Interests: Going fast, and drinking GT's😃
Boat make: Campion 565
Engines: 300 Promax
Cruising area: Mostly around water...

Join Date: Mar 2009
Location: The Island Fyn
Posts: 369
I was thinking the same. Could it be the carb's hava some dirt in them that makes them run poorly at idle speeds?
__________________
Present boat:
Campion 565/300 Promax

Recent boats:
Phantom 21/225 Optimax
Fletcher 199 Bravo/150 Yamaha
RING 16/90 Yamaha
Fletcher 199/200 Merury
Mustang-Trekpoint/50 Suzuki
Fletcher 161/100 Mercury
Fletcher 160/100 Mercury
Fletcher 199/200 Mercury EFI
Campion Cortes 165/200 Mercury
Global 13/50 Mercury
Selco 15/35 Johnson, 50 Mercury
Campion 165(seb) is offline   Reply With Quote
Old 16-09-2016, 07:40 PM   #7
Registered User
 
mike k's Avatar
 
Country: Scotland
Location: Kirkcudbright
Interests: Boats n Lambrettas
Boat make: Boatless

Join Date: Mar 2004
Location: Kirkcudbright
Posts: 978
Not sure if this helps but I had the same problem on a Merc I used to have and it turned out to be the diaphram on the fuel pump....good luck with finding the problem
mike k is offline   Reply With Quote
Old 16-09-2016, 07:46 PM   #8
Registered User
 

Join Date: Sep 2016
Posts: 7
Thanks, will check them
leightonkeay@yahoo.co.uk is offline   Reply With Quote
Old 16-09-2016, 09:54 PM   #9
Registered User
 
Campion 165(seb)'s Avatar
 
Country: Denmark
Location: The Island Fyn
Occupation: Worker
Interests: Going fast, and drinking GT's😃
Boat make: Campion 565
Engines: 300 Promax
Cruising area: Mostly around water...

Join Date: Mar 2009
Location: The Island Fyn
Posts: 369
Quote:
Originally Posted by mike k View Post
Not sure if this helps but I had the same problem on a Merc I used to have and it turned out to be the diaphram on the fuel pump....good luck with finding the problem
Shouldn't the problem multiply once the engine rev up to top speed - aka need of more fuel? (If you get my point?)
__________________
Present boat:
Campion 565/300 Promax

Recent boats:
Phantom 21/225 Optimax
Fletcher 199 Bravo/150 Yamaha
RING 16/90 Yamaha
Fletcher 199/200 Merury
Mustang-Trekpoint/50 Suzuki
Fletcher 161/100 Mercury
Fletcher 160/100 Mercury
Fletcher 199/200 Mercury EFI
Campion Cortes 165/200 Mercury
Global 13/50 Mercury
Selco 15/35 Johnson, 50 Mercury
Campion 165(seb) is offline   Reply With Quote
Old 16-09-2016, 09:56 PM   #10
Registered User
 

Join Date: Sep 2016
Posts: 7
They are fine at top speed, singing away with no problems
leightonkeay@yahoo.co.uk is offline   Reply With Quote
Old 16-09-2016, 10:33 PM   #11
Registered User
 
mike k's Avatar
 
Country: Scotland
Location: Kirkcudbright
Interests: Boats n Lambrettas
Boat make: Boatless

Join Date: Mar 2004
Location: Kirkcudbright
Posts: 978
Quote:
Originally Posted by Campion 165(seb) View Post
Shouldn't the problem multiply once the engine rev up to top speed - aka need of more fuel? (If you get my point?)
I know what you mean but by changing mine it cured the problem..it wasnt split but probably got weak.
mike k is offline   Reply With Quote
Old 17-09-2016, 06:30 AM   #12
Registered User
 
Campion 165(seb)'s Avatar
 
Country: Denmark
Location: The Island Fyn
Occupation: Worker
Interests: Going fast, and drinking GT's😃
Boat make: Campion 565
Engines: 300 Promax
Cruising area: Mostly around water...

Join Date: Mar 2009
Location: The Island Fyn
Posts: 369
Quote:
Originally Posted by mike k View Post
I know what you mean but by changing mine it cured the problem..it wasnt split but probably got weak.
Okay, point taken. Just as long as it worked for you😄.
Remember to keep us posted Of the result👍🏻
__________________
Present boat:
Campion 565/300 Promax

Recent boats:
Phantom 21/225 Optimax
Fletcher 199 Bravo/150 Yamaha
RING 16/90 Yamaha
Fletcher 199/200 Merury
Mustang-Trekpoint/50 Suzuki
Fletcher 161/100 Mercury
Fletcher 160/100 Mercury
Fletcher 199/200 Mercury EFI
Campion Cortes 165/200 Mercury
Global 13/50 Mercury
Selco 15/35 Johnson, 50 Mercury
Campion 165(seb) is offline   Reply With Quote
Old 17-09-2016, 07:52 AM   #13
Registered User
 

Join Date: Sep 2016
Posts: 7
Will do, and thanks for suggestions
leightonkeay@yahoo.co.uk is offline   Reply With Quote
Old 19-09-2016, 10:17 AM   #14
Registered User
 
Silversurfer's Avatar
 
Country: UK
Location: Thorpe Bay
Occupation: IT Director, www.lighthouseit.co.uk
Interests: Boats, Surfing & Snowboarding
Boat name: Isabella / Cool Runnings II / Bella / Sea Pup / Sea Dog / Speedy II / Bernico F3
Boat make: Colvic 35 Suncruiser / Bernico F3 / Phantom 16 / Zodiac 420 YL / RIB / Apollo 9
Engines: 2 x Perkins Sabre 225ti / Mercury Pro XS /Mercury Pro XS 115/ Tohatsu 2.5 / Mercury 25 / Mercury 50
Cruising area: Thames Estuary / River Crouch / Salcombe

Join Date: Jun 2004
Location: Thorpe Bay
Posts: 932
Quote:
Originally Posted by leightonkeay@yahoo.co.uk View Post
Hi, yes they are carbs
I had a similar problem, Try this, drain the fuel in the carbs by removing the little bolts on each carb.
Locate the jet screws. You can either mark and turn in first to work out how many turns out they are set at or check the manual for the default settings. My F100 is 2 turns out.

Get some carb cleaner spray into the jet holes on each carb, spray the jets and put back in. Replace the bolts you took out to drain the carbs.

Additional but may not be required I added loads of Seafoam to the fuel tanks. I also replaced the primer bulb as it looked like it was breaking down on the inside and the fuel filter.

This solved the problem for me.
__________________
Loving the Spitfire with a 25HP Mercury
Silversurfer is offline   Reply With Quote
Old 19-09-2016, 10:25 AM   #15
Registered User
 

Join Date: Sep 2016
Posts: 7
Ok thanks, will do
__________________

leightonkeay@yahoo.co.uk is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3

All times are GMT +1. The time now is 08:40 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
×