Register free!
Search
 
     

The Green Industry's Resource Center


Click for Weather
Reply
 
Thread Tools Display Modes
  #1  
Old 01-28-2013, 11:32 AM
accurate machinery accurate machinery is offline
Sponsor
 
Join Date: Jan 2007
Location: Frederick, Maryland
Posts: 165
8HP Briggs not starting

I am trying to fix a friends Craftsman snow blower, it is powered by a 8HP Briggs overhead valve engine, the stamped production is 010804, so it is a 2004 as I understand. It has a one speed carb, no throttle control, no points. Just a coil triggered by the flywheel. The machine runs good when it runs, but to start it, I have to hold the throttle closed with my hand while pulling the cord, and even then it only will start sometimes if I warm it up (bring it inside). The spark is pink and erratic not bright blue like I would like. I have cleaned the carb, it is getting fuel and has good compression, I think the coil is failing. Do these coils go bad? I am not use to replacing coils but I have been out of the repair business. Any help would be greatly appreciated!
__________________
Accurate Machinery LLC
27 years in Construction Equipment
www.accuratemachinery.com
Reply With Quote
  #2  
Old 01-28-2013, 11:48 AM
Patriot Services's Avatar
Patriot Services Patriot Services is online now
LawnSite Fanatic
 
Join Date: Jul 2006
Location: Tampa FL
Posts: 7,923
They do fail sometimes but try this first. Remove the coil and make sure all the mating surfaces are good and clean. Reinstall and set the correct gap (folded piece of paper works fine). See if that improves spark quality.
Posted via Mobile Device
Reply With Quote
  #3  
Old 01-28-2013, 11:52 AM
Landrus2's Avatar
Landrus2 Landrus2 is offline
LawnSite Platinum Member
 
Join Date: Dec 2006
Location: Big apple
Posts: 4,683
Briggs and cold don't mix very well. First thing I would replace would be spark plug.
Reply With Quote
  #4  
Old 01-28-2013, 11:57 AM
accurate machinery accurate machinery is offline
Sponsor
 
Join Date: Jan 2007
Location: Frederick, Maryland
Posts: 165
Sorry, I forgot to mention that I did replace the spark plug. I sanded the minor rust on the flywheel magnet. Thanks, Ken
__________________
Accurate Machinery LLC
27 years in Construction Equipment
www.accuratemachinery.com
Reply With Quote
  #5  
Old 01-28-2013, 12:08 PM
dutch1's Avatar
dutch1 dutch1 is online now
LawnSite Silver Member
 
Join Date: Dec 2004
Location: Jayhawk
Posts: 2,138
Follow Patriot's instructions--what he means is to clean the coil and mounting bosses that the coil is mounted to, Over time corrosion develops and contibutes to a bad ground.

In addition, you may try pulling the kill lead to the coil and check spark.
Reply With Quote
  #6  
Old 01-28-2013, 01:20 PM
Landrus2's Avatar
Landrus2 Landrus2 is offline
LawnSite Platinum Member
 
Join Date: Dec 2006
Location: Big apple
Posts: 4,683
Quote:
Originally Posted by accurate machinery View Post
Sorry, I forgot to mention that I did replace the spark plug. I sanded the minor rust on the flywheel magnet. Thanks, Ken
OK we having some progress have you tested it for spark you say you have pink colored sparks that is due from 95 octane fuel no problem there.
Do you have spark
Reply With Quote
  #7  
Old 01-28-2013, 01:43 PM
piston slapper's Avatar
piston slapper piston slapper is offline
LawnSite Platinum Member
 
Join Date: Mar 2010
Location: Tampa Fl
Posts: 4,005
Quote:
Originally Posted by joesimoes2 View Post
OK we having some progress have you tested it for spark you say you have pink colored sparks that is due from 95 octane fuel no problem there.
Do you have spark
OK...I'll bite...
Where does it say 95 octane caused or causes pink colored sparks...???
__________________
If You Have All The Answers...Except The One You Need...You're Not Trying Hard Enough...
Do The Work
Reply With Quote
  #8  
Old 01-28-2013, 03:05 PM
piston slapper's Avatar
piston slapper piston slapper is offline
LawnSite Platinum Member
 
Join Date: Mar 2010
Location: Tampa Fl
Posts: 4,005
Quote:
Originally Posted by joesimoes2 View Post
No certification OK So tell you story why do sparks get pink colored
My apologies in advance to the OP...again...
I havent listed my certifications in over a week...this guy that has been a member of this site since 2006 must have forgotten...more than that I reckon...

Kohler Certified Expert Tech since 1998...yes I have an update school next week..
Briggs MST..Kawasaki Schools 98 to present...Hydrogear schools...Im sure Im leaving a few out..??
In any case..I cant figure out how 95 octane...or anything to do with the fuel can affect the color of the spark...
Im only familiar with yellow and blue sparks...we dont have pink sparks around here..
Yellow is weak..Blue is good...Pink ??? the lighting must be playing tricks on his eyes.

The 8hp Briggs in this thread has an inductive coil...clean the coil mounting areas and set the airgap to .010..with the kill wire disconnected...pull the rope...if you dont get a nice blue spark...coil is weak...
__________________
If You Have All The Answers...Except The One You Need...You're Not Trying Hard Enough...
Do The Work
Reply With Quote
  #9  
Old 01-28-2013, 03:25 PM
accurate machinery accurate machinery is offline
Sponsor
 
Join Date: Jan 2007
Location: Frederick, Maryland
Posts: 165
Thanks for the replies, I am guessing the owner has had this problem for a while, the electric starter is worn out and the pull rope is starting to frey. The gap on the coil has been set, the flywheel sanded and I have a weak looking spark. I know a spark should be bright blue, so I am suspect of the coil, since it seems at times to have no spark, wont start at all. Then with no reason it will start. That is what makes me suspect the coil, I am not used to replacing a coil and didn't want to go buy one to find out that it is not the problem, I also checked the flywheel key, it is normal. I know I have gas and compression, checked the valve clearances, all I have left is weak spark.
__________________
Accurate Machinery LLC
27 years in Construction Equipment
www.accuratemachinery.com
Reply With Quote
  #10  
Old 01-28-2013, 03:36 PM
Patriot Services's Avatar
Patriot Services Patriot Services is online now
LawnSite Fanatic
 
Join Date: Jul 2006
Location: Tampa FL
Posts: 7,923
You still need to sand the coil mounts, not just the flywheel.
Posted via Mobile Device
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





Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 09:49 AM.

Page generated in 0.08555 seconds with 7 queries