Reply
 
Thread Tools Search this Thread
 
Old 23 September 2022, 16:22   #1
Member
 
Country: UK - England
Town: High Wycombe
Boat name: Miles Away
Make: Avon
Length: 5m +
Engine: Outboard
Join Date: Sep 2020
Posts: 86
Engine too heavy?

Hi All,

I have a Yamaha 90A which weighs 125kg on the back of my 5.5m avon seasport

Its very broken and am putting on a new engine

I am thinking of Yamaha F100A - which weighs 166kg

Is that extra 40kg a big deal.

It sounds like it might be a big deal.

The weights and measures plate on the transom does not specify a max weight for the engine.

Cheers
__________________

__________________
Herman Melville is offline   Reply With Quote
Old 23 September 2022, 18:02   #2
Member
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 11,347
RIBase
Quote:
Originally Posted by Herman Melville View Post
Hi All,



I have a Yamaha 90A which weighs 125kg on the back of my 5.5m avon seasport



Its very broken and am putting on a new engine



I am thinking of Yamaha F100A - which weighs 166kg



Is that extra 40kg a big deal.



It sounds like it might be a big deal.



The weights and measures plate on the transom does not specify a max weight for the engine.



Cheers


Whatís the highest output engine in that weight class of Yammie? I.e is the 100 the same block & weight of say, the 115?
__________________

__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:https://www.youtube.com/watch?v=unkIVvjZc9Y
Pikey Dave is offline   Reply With Quote
Old 23 September 2022, 18:36   #3
Member
 
Country: UK - England
Town: Southampton
Make: avon adventure 4.5
Length: 4m +
Engine: 50hp e-tec
Join Date: Jun 2010
Posts: 292
My friend has a 90hp merc 4s from 2004 on an apex 5.5. Those old 4 strokes were even heavier at 176kg ish. I know it doesn't directly answer your question but context can help and it shows your engine isn't the heaviest out there.

I think cjj216 who used to post here had an adventure 5.6 with a 125 4s on it so I can't imagine even a heavy 100 will be too much.
__________________
rik_elliott is offline   Reply With Quote
Old 23 September 2022, 18:55   #4
Member
 
Country: UK - England
Town: High Wycombe
Boat name: Miles Away
Make: Avon
Length: 5m +
Engine: Outboard
Join Date: Sep 2020
Posts: 86
Cheers sounds positive
__________________
Herman Melville is offline   Reply With Quote
Old 23 September 2022, 18:56   #5
Member
 
Country: UK - England
Town: High Wycombe
Boat name: Miles Away
Make: Avon
Length: 5m +
Engine: Outboard
Join Date: Sep 2020
Posts: 86
Quote:
Originally Posted by Pikey Dave View Post
Whatís the highest output engine in that weight class of Yammie? I.e is the 100 the same block & weight of say, the 115?
Yes seems 100 is same weight as 115
__________________
Herman Melville is offline   Reply With Quote
Old 23 September 2022, 19:46   #6
Member
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 11,347
RIBase
Quote:
Originally Posted by Herman Melville View Post
Yes seems 100 is same weight as 115


Put the 115 on them, no point carrying dead weight.
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:https://www.youtube.com/watch?v=unkIVvjZc9Y
Pikey Dave is offline   Reply With Quote
Old 23 September 2022, 20:47   #7
Member
 
Country: UK - England
Town: bedford
Make: tornado
Length: 5m +
Engine: outboard 60hp merc
Join Date: Oct 2007
Posts: 315
Our 5,5 tornado has a 115 yam 2s which is 160 kg and seems fine. We do also hang a small Yamaha malta kicker on the back and again doesnít feel heavy at the stern.

If you can go for the bigger engine.
__________________
davej is offline   Reply With Quote
Old 24 September 2022, 07:59   #8
Member
 
Country: UK - England
Town: High Wycombe
Boat name: Miles Away
Make: Avon
Length: 5m +
Engine: Outboard
Join Date: Sep 2020
Posts: 86
cheers all

Also just checking - if my 90A shaft code on the plate was 'L'....

then another Yamaha engine also with 'L' for the shaft code will fit my transom right ?
__________________
Herman Melville is offline   Reply With Quote
Old 24 September 2022, 08:32   #9
Member
 
Country: UK - England
Town: Abersoch
Boat name: vanishing point
Make: phantom, Ribtec
Length: 6m +
Engine: 200hp
Join Date: Nov 2014
Posts: 402
Quote:
Originally Posted by Herman Melville View Post
cheers all



Also just checking - if my 90A shaft code on the plate was 'L'....



then another Yamaha engine also with 'L' for the shaft code will fit my transom right ?
L = Long Shaft (20inch) aprox

XL = XL (25inch)
__________________
whiskylee is offline   Reply With Quote
Old 24 September 2022, 08:57   #10
Member
 
Country: UK - England
Town: Abersoch
Boat name: vanishing point
Make: phantom, Ribtec
Length: 6m +
Engine: 200hp
Join Date: Nov 2014
Posts: 402
Quote:
Originally Posted by Herman Melville View Post
Hi All,



I have a Yamaha 90A which weighs 125kg on the back of my 5.5m avon seasport



Its very broken and am putting on a new engine



I am thinking of Yamaha F100A - which weighs 166kg



Is that extra 40kg a big deal.



It sounds like it might be a big deal.



The weights and measures plate on the transom does not specify a max weight for the engine.



Cheers
Is your boat a Avon seasport 545 ? If so max HP is 90 Click image for larger version

Name:	Screenshot_20220924-095548.jpg
Views:	64
Size:	59.4 KB
ID:	141557
__________________
whiskylee is offline   Reply With Quote
Old 24 September 2022, 11:21   #11
Member
 
Country: UK - England
Town: High Wycombe
Boat name: Miles Away
Make: Avon
Length: 5m +
Engine: Outboard
Join Date: Sep 2020
Posts: 86
Yes it is - Ok that is bad news.

What are the downsides from going over by 10hp ?
__________________
Herman Melville is offline   Reply With Quote
Old 24 September 2022, 11:55   #12
Member
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 11,347
RIBase
Quote:
Originally Posted by Herman Melville View Post
Yes it is - Ok that is bad news.



What are the downsides from going over by 10hp ?


Depends on your attitude to risk & your insurance company, if you have one. I told my insurance company that I was slightly overpowered & they asked me what the top speed was. They were happy with my answer & insured the boat.
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:https://www.youtube.com/watch?v=unkIVvjZc9Y
Pikey Dave is offline   Reply With Quote
Old 30 September 2022, 10:57   #13
Member
 
Swordfish's Avatar
 
Country: Other
Town: Shanghai & Tarbert Argyll
Boat name: The Black Sheep
Make: Ribcraft
Length: 5m +
Engine: Yamaha 90 Two Stroke
Join Date: Jul 2009
Posts: 47
..or you could buy my low hours 90 AETOL
https://www.rib.net/forum/f10/yamaha...-new-post.html
__________________
Swordfish is offline   Reply With Quote
Old 30 September 2022, 12:04   #14
Member
 
Country: UK - England
Town: High Wycombe
Boat name: Miles Away
Make: Avon
Length: 5m +
Engine: Outboard
Join Date: Sep 2020
Posts: 86
thanks @swordfish looks like a nice engine but am going to go with the 100 - its at a boatbuilders in my marina so much easier
__________________
Herman Melville is offline   Reply With Quote
Old 30 September 2022, 19:44   #15
Member
 
Bigmuz7's Avatar
 
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,090
Quote:
Originally Posted by Herman Melville View Post
Yes it is - Ok that is bad news.

What are the downsides from going over by 10hp ?

Not a lot if insurance is ok and weight is good .. think of the slamming and knocks the boat takes every time you hit some wind and tide ? which wouldnt trouble it



The extra weight is only a concern when/if you are at anchor. I had a 135 2 stroke on a 5.8 once which needed the transom raised due to this problem. Try some ballast first if you are concerned if you anchor at sea
__________________
Bigmuz7 is offline   Reply With Quote
Old 01 October 2022, 10:50   #16
Member
 
Country: UK - England
Town: Leicester
Length: 5m +
Engine: 135hp Mercury
Join Date: Sep 2013
Posts: 1,318
^^^
If that was the Mercury 135 V6 the manual for mine (late 80s Black Max) gives it as 172kg/378lbs.

It's a 17' Dory & not had an issue anchored bow on to wave, but if fishing on the drift & there's much wave I stream a drogue to keep the boat side on or slightly bow on to the wave or I'm likely to get some water over the lower part of the stern where the engine sits.
The weight does keep it low.

Incidentally, never anchor stern on to the tide run /wave direction as it will pull the stern down & you may well be swamped & sink.
One of the locals shot a string of pots & got the last section of rope to the dahn caught round the outboard's prop. Unable to free it that's exactly what happened.
__________________
paintman is offline   Reply With Quote
Old 01 October 2022, 18:38   #17
Member
 
Country: UK - Scotland
Town: wormit
Boat name: lots of them
Make: various
Length: no boat
Engine: all types
Join Date: Dec 2004
Posts: 590
Have you bought the Humber 5.5 and now selling the boat and trailer only on fb?
__________________
Davie is offline   Reply With Quote
Old 02 October 2022, 06:56   #18
Member
 
Country: UK - England
Town: High Wycombe
Boat name: Miles Away
Make: Avon
Length: 5m +
Engine: Outboard
Join Date: Sep 2020
Posts: 86
No fitting a new engine to my Avon @Davie
__________________
Herman Melville is offline   Reply With Quote
Old 05 October 2022, 08:38   #19
Member
 
Country: New Zealand
Town: Auckland
Boat name: yard arm
Make: Superduck
Length: 5m +
Engine: Petrol
Join Date: Sep 2022
Posts: 1
I have a mariner 90 2 stroke on my 5.4 and ive been told by a guy that replaced my tubes that they can take up to 115. I dont have a weight plate on my boat either
__________________
kingfishnz is offline   Reply With Quote
Old 05 October 2022, 09:01   #20
Member
 
Swordfish's Avatar
 
Country: Other
Town: Shanghai & Tarbert Argyll
Boat name: The Black Sheep
Make: Ribcraft
Length: 5m +
Engine: Yamaha 90 Two Stroke
Join Date: Jul 2009
Posts: 47
Quote:
Originally Posted by Herman Melville View Post
thanks @swordfish looks like a nice engine but am going to go with the 100 - its at a boatbuilders in my marina so much easier
Completely understand Mr. Melville! It would be not like me at all to try to dissuade you from an increase in power!
__________________

__________________
Swordfish is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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




All times are GMT. The time now is 10:16.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.