Reply
 
Thread Tools Search this Thread
 
Old 07 August 2014, 15:01   #1
Member
 
Country: UK - England
Town: portsmouth
Boat name: patch
Make: avon sr5.4/4m
Length: 5m +
Engine: mercury 90/honda 30
Join Date: Oct 2008
Posts: 253
Tohatsu 60 loosing power !!

It's running perfect apart from when your over 3/4 throttle then she's loosing power and haunting any ideas ???
__________________

__________________
tim2658 is offline   Reply With Quote
Old 07 August 2014, 16:40   #2
Member
 
spartacus's Avatar
 
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,073
RIBase
Sounds like fuel starvation. Fuel pump rebuild kits are fairly inexpensive. You could try starting engine, then removing fuel pump from engine block, then squeeze the fuel bulb. If fuel comes out of the diaphragm - then renew. I tend to renew anyway after a couple of years for peace of mind.

Also look at the primer bulb itself. The internal diaphragm may have collapsed. If renewing, go for a decent make such as Quicksilver.

Also look at butterfly valve (behind airbox cover). The choke operates this valve and my own one seized, so I know they can fail.
__________________

__________________
Is that with or without VAT?
spartacus is offline   Reply With Quote
Old 07 August 2014, 16:44   #3
Member
 
pow2gran's Avatar
 
Country: UK - England
Town: Newcastle, Staffs
Boat name: Just Looking
Make: Ribcraft 5.85
Length: 5m +
Engine: Suzuki 140hp
Join Date: Jan 2011
Posts: 327
I had a Tohatsu 60hp that would die at full throttle. Try pumping the fuel bulb. If it picks up then it is a fuel problem. I had two problems. The first was a crack in the casing of the small plastic fuel filter that is under the cowl on the inlet to the engine. The second issue was with the fuel pump. I had this replaced and after that I never had any problems. Also you should make sure all the carbs are clean. From what I have been told 9 times out of 10 the issue will be fuel. The engines are generally uncomplicated and simple.

Best of luck

Nick
__________________
pow2gran is offline   Reply With Quote
Old 07 August 2014, 16:49   #4
Member
 
Country: UK - England
Town: portsmouth
Boat name: patch
Make: avon sr5.4/4m
Length: 5m +
Engine: mercury 90/honda 30
Join Date: Oct 2008
Posts: 253
Cheers guys, I put a pump rebuild kit in tonight and still the same, so not that !! But I tried pumping the bulb when she starts to die and she picks straight up and flys so now I know it fuel, do you think a good carb clean is in order !!!
__________________
tim2658 is offline   Reply With Quote
Old 07 August 2014, 17:07   #5
Member
 
spartacus's Avatar
 
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,073
RIBase
Quote:
Originally Posted by tim2658 View Post
Cheers guys, I put a pump rebuild kit in tonight and still the same, so not that !! But I tried pumping the bulb when she starts to die and she picks straight up and flys so now I know it fuel, do you think a good carb clean is in order !!!
Fuel bowls must be starved, so could be sticky float valve. Wouldn't bother with carb cleaner, this is a carb strip down job. Easy enough job. Take your time, be thorough, use brake cleaner or carb cleaner. Dry and reassemble.

As you remove carbs, drain the fuel bowls and check for contaminants. Use a cotton bud on the jets, etc. Ensure you don't adjust fuel mixture pilot screws. If you do remove to clean, count the turns. Normally 1 turns out from lightly seated
__________________
Is that with or without VAT?
spartacus is offline   Reply With Quote
Old 07 August 2014, 17:36   #6
Member
 
Country: UK - England
Town: portsmouth
Boat name: patch
Make: avon sr5.4/4m
Length: 5m +
Engine: mercury 90/honda 30
Join Date: Oct 2008
Posts: 253
Cheers will do this tomorrow and let you know !!
__________________
tim2658 is offline   Reply With Quote
Old 07 August 2014, 18:28   #7
Member
 
lukewhiting's Avatar
 
Country: UK - England
Town: swanage
Make: Thundercat
Length: 4m +
Engine: Tohatsu 50
Join Date: Apr 2012
Posts: 850
Had the exact same on my tohatsu m50d2. Carbs needed cleaning & also new coils then it ran perfect!
__________________

__________________
lukewhiting 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




Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 13:05.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.