Return to the home page...

Go Back   Moyer Marine Atomic 4 Community - Home of the Afourians > Discussion Topics > Fuel System

Reply
 
Thread Tools Display Modes
  #1   IP: 192.186.122.174
Old 03-07-2019, 02:48 PM
GregH's Avatar
GregH GregH is offline
Senior Member
 
Join Date: Jun 2015
Location: Kingston, ON
Posts: 318
Thanks: 161
Thanked 26 Times in 24 Posts
Idle & RPM

So, when one leans out the idle mixture, would that affect the rpm everything else being the same?
__________________
Greg
1975 Alberg 30

Last edited by GregH; 03-11-2019 at 08:44 AM.
Reply With Quote
  #2   IP: 97.93.70.7
Old 03-07-2019, 06:17 PM
Dave Neptune Dave Neptune is offline
Afourian MVP
 
Join Date: Jan 2007
Location: Lake Arrowhead Ca.
Posts: 3,875
Thanks: 376
Thanked 301 Times in 214 Posts
It can and should have a "slight" influence in RPM's until it begins to shudder to a stop. Maybe +/- 50 RPM.

Dave Neptune
Reply With Quote
  #3   IP: 192.186.122.174
Old 03-11-2019, 08:44 AM
GregH's Avatar
GregH GregH is offline
Senior Member
 
Join Date: Jun 2015
Location: Kingston, ON
Posts: 318
Thanks: 161
Thanked 26 Times in 24 Posts
OK, not as much as I was thinking.
__________________
Greg
1975 Alberg 30
Reply With Quote
  #4   IP: 97.93.70.7
Old 03-11-2019, 11:44 AM
Dave Neptune Dave Neptune is offline
Afourian MVP
 
Join Date: Jan 2007
Location: Lake Arrowhead Ca.
Posts: 3,875
Thanks: 376
Thanked 301 Times in 214 Posts
Red face Many things perhaps

Greg, you may have there issues as the +/- I gave you are for a good tune as far as all else is concerned. Timing, sticky advance weights, float level, any kind of a vacuum leak and the carb internal seals all can cause adverse idle conditions which will render proper adjustment of the idle mix most difficult and almost impossible to get set.

What is the state of tune from above? Any recent work on the carb? Did you check for any vacuum leaks?

Can you describe what has been done and what is currently being tried?

Dave Neptune
Reply With Quote
The Following 2 Users Say Thank You to Dave Neptune For This Useful Post:
Administrator (03-11-2019), thatch (03-11-2019)
  #5   IP: 72.194.222.152
Old 03-11-2019, 05:25 PM
JOHN COOKSON JOHN COOKSON is offline
Afourian MVP
 
Join Date: Nov 2008
Posts: 2,999
Thanks: 35
Thanked 483 Times in 377 Posts
After you lean the idle you might also notice:

Cleaner running spark plugs.

Hard starts, especially when the engine cold. If this happens check to be sure the choke is closing all the way.

TRUE GRIT
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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Good Problem Jimmy General Interest 6 05-14-2012 10:04 PM
Erratic Engine Speed Unregistered Troubleshooting 3 01-24-2012 10:12 PM
Issues at idle TomG Fuel System 39 10-19-2011 06:31 PM
Suspected Idle Circuit Blockage - causing idle problems dman535 Fuel System 15 07-19-2009 07:49 AM
Idle RPM tartan30cirrus General Maintenance 6 05-17-2005 06:58 PM


All times are GMT -4. The time now is 03:47 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.


Universal® is a registered trademark of Westerbeke Corporation

Copyright © 2004-2019 Moyer Marine Inc.

All Rights Reserved