Reply
 
Thread Tools Search this Thread
 
Old 29 June 2015, 11:18   #1
Member
 
Country: UK - England
Town: Sheffield
Boat name: Touch Bottom
Make: Avon
Length: 4m +
Engine: 50 hp Merc Power t&t
Join Date: Jul 2008
Posts: 239
4hp Yamaha, problems.

I have a 4hp 2 stroke Yamaha, circa 1985. It refuses to start, can any one tell me how to check the ignition timing on this engine please. I have re built the carb using new diaphrams and gaskets, but it still has the face on. Any help in pacifying this little sod will be appreciated.
__________________

__________________
Mercury is offline   Reply With Quote
Old 29 June 2015, 11:24   #2
Member
 
Country: USA
Town: S. Carolina
Boat name: D560
Make: Avon
Length: 5m +
Engine: 2016 Merc 115hp CT
Join Date: Aug 2013
Posts: 1,121
Quote:
Originally Posted by Mercury View Post
I have a 4hp 2 stroke Yamaha, circa 1985. It refuses to start, can any one tell me how to check the ignition timing on this engine please. I have re built the carb using new diaphrams and gaskets, but it still has the face on. Any help in pacifying this little sod will be appreciated.
Are you getting spark?
__________________

__________________
Richard
Gluing geek since 2007
office888 is offline   Reply With Quote
Old 29 June 2015, 15:08   #3
Member
 
Country: UK - England
Town: Leicester
Length: 5m +
Engine: 135hp Mercury
Join Date: Sep 2013
Posts: 708
Kill cord connected?
__________________
paintman is offline   Reply With Quote
Old 30 June 2015, 02:50   #4
Member
 
Country: UK - England
Town: Sheffield
Boat name: Touch Bottom
Make: Avon
Length: 4m +
Engine: 50 hp Merc Power t&t
Join Date: Jul 2008
Posts: 239
Quote:
Originally Posted by office888 View Post
Are you getting spark?
Hi, Yes spark is there, but about every fourth pull or so I get a little backfire, thats why I question the timing.
__________________
Mercury is offline   Reply With Quote
Old 30 June 2015, 02:51   #5
Member
 
Country: UK - England
Town: Sheffield
Boat name: Touch Bottom
Make: Avon
Length: 4m +
Engine: 50 hp Merc Power t&t
Join Date: Jul 2008
Posts: 239
Quote:
Originally Posted by paintman View Post
Kill cord connected?
Hi. No kill cord on this, so I checked kill button it's working fine..
__________________
Mercury is offline   Reply With Quote
Old 30 June 2015, 02:56   #6
Member
 
Country: UK - England
Town: Leicester
Length: 5m +
Engine: 135hp Mercury
Join Date: Sep 2013
Posts: 708
If you squirt a small amount of petrol into the carb intake does it attempt to run?
Has it ever run properly in your ownership?
__________________
paintman is offline   Reply With Quote
Old 30 June 2015, 20:07   #7
Spammer
 
Country: Canada
Town: Southern Ontario
Boat name: -Unknown-
Make: SeaMax
Length: 4m +
Engine: Merc/Minn Kota
Join Date: Mar 2012
Posts: 216
after all the work..RUSH it in. Seriously. 20-40 pounds they'll set timing, start choke, ignition coils ohm tests. All kinds of stuff based on your work.
__________________
Nightfisher is offline   Reply With Quote
Old 30 June 2015, 20:41   #8
Member
 
Country: UK - England
Town: Leicester
Length: 5m +
Engine: 135hp Mercury
Join Date: Sep 2013
Posts: 708
Quote:
Originally Posted by Nightfisher View Post
after all the work..RUSH it in. Seriously. 20-40 pounds they'll set timing, start choke, ignition coils ohm tests. All kinds of stuff based on your work.
Is this an ad for a company called RUSH in Ontario? If it is, it might be a bit far for the OP who's in England.....
__________________
paintman is offline   Reply With Quote
Old 01 July 2015, 04:07   #9
Member
 
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,276
Agree it's important to know if it's ever been running for you and what has been done so that it doesn't go now.... just the carb overhaul??

Agree too a squirt of fuel down the carb should make it fire for a couple of seconds if it's a fuel issue... pull the plug and turn over to watch for spark to check if it's strong or weak.

Timing doesn't go out (usually) unless fiddled with.

Does this have electronic ign or points? Electronic is usually reliable but points can fail.... they are rarely checked on an outboard due to the hassle of removing the flywheel.
__________________
Fenlander is offline   Reply With Quote
Old 01 July 2015, 16:52   #10
Member
 
Country: UK - England
Town: Sheffield
Boat name: Touch Bottom
Make: Avon
Length: 4m +
Engine: 50 hp Merc Power t&t
Join Date: Jul 2008
Posts: 239
Quote:
Originally Posted by paintman View Post
If you squirt a small amount of petrol into the carb intake does it attempt to run?
Has it ever run properly in your ownership?
Iv'e not tried the squirt treatment yet, But it was running fine last year, had this from new btw.
__________________

__________________
Mercury 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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 18:50.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.