Antique Engines and Old Iron
[Home] - [HELP] - [Forums] - [Groups] - [Classified Ads] - [Subscribe] - [Books] - [Sponsors] -

Go Back   SmokStak > SmokStak® Antique Engine Community > Magnetos, Ignition Coils and Spark Plugs
Forgot Password? Join Us!

Notices

Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Wico PR trouble


this thread has 7 replies and has been viewed 393 times

Reply
 
Thread Tools Display Modes
  #1  
Old 10-20-2019, 03:17:38 AM
IHCman IHCman is offline
Registered
 
Join Date: Sep 2017
Location: Stephenson, Michigan, USA
Posts: 37
Thanks: 1
Thanked 20 Times in 11 Posts
Default Wico PR trouble

Hello, I have a Wico PR that has intermittent spark, I'll either wont be able to start my engine or it will run great for an hour or so then it starts to act up, seemingly when it gets warm. I made sure the points cap is 7/64" as the instruction book says.

I have another PR that I put on the same engine to eliminate it being a non mag issue and it fires right back up again like no ones business and runs for hours while I saw.

I had the cover off and watched the inside of the mag while the engine died and was still coasting and tripping the mag. It was almost dark outside and noticed sparks jumping out of both coils at one trip or another, and a really bright one between the points at times.

I know this is a dumb question for those with magneto/electrical backround but what would be some possible issues causing this? bad coils? coil windings grounding out when the potting gets warm?

The coils seem to be original with tar potting or whatever they used, they are sitting on top of paper and the capacitor looks modern with plastic insulation on the wires while the coils have woven fabric. The wire that bridges the two coils has cracks in the insulation, not sure if this matters since it doesn't come into contact with the housing.

Thank you for any suggestions.
Attached Thumbnails
Click image for larger version

Name:	IMG_20191020_015551[1].jpg
Views:	69
Size:	237.1 KB
ID:	347035  
Reply With Quote
Sponsored Links
  #2  
Old 10-20-2019, 06:21:01 AM
cobbadog cobbadog is offline
Registered
 
Join Date: Aug 2009
Location: Coopernook. N.S.W. Australia
Posts: 1,947
Thanks: 3,482
Thanked 881 Times in 585 Posts
Default Re: Wico PR trouble

Sounds like bad coil/s to me. Arcing out once warm is a classic symton. Usually due to insulation breaking down and then the spark takes the shortest route to ground.
Start looking for a pair of coils at least. If you are going to rebuild this one for the small amount extra replace the condensor as well to ensure all is good.
Reply With Quote
  #3  
Old 10-20-2019, 09:54:14 AM
Mitch Malcolm Mitch Malcolm is offline
Subscriber
 
Join Date: Sep 2005
Location: Ottertail, Minnesota, USA
Posts: 627
Thanks: 776
Thanked 595 Times in 320 Posts
Default Re: Wico PR trouble

Your coils are junk a sure sign of a set of coils bad or on there way out is the glossy finish on the outside that is caused when the secondary windings are jumping between layers of windings . The currant is always looking for a path of less resistance to ground .
Reply With Quote
  #4  
Old 10-20-2019, 07:27:28 PM
IHCman IHCman is offline
Registered
 
Join Date: Sep 2017
Location: Stephenson, Michigan, USA
Posts: 37
Thanks: 1
Thanked 20 Times in 11 Posts
Default Re: Wico PR trouble

Thank you for the help fellas, Any online references to step by step disassembly of these? I know I could do it easy enough but don't know if there's a wrong way to do it that would effect the magnets in some way, any good suggestions for reputable sellers of coils? Also will it need to be recharged after the new coils are in? Thank you
Reply With Quote
  #5  
Old 10-21-2019, 06:29:27 AM
cobbadog cobbadog is offline
Registered
 
Join Date: Aug 2009
Location: Coopernook. N.S.W. Australia
Posts: 1,947
Thanks: 3,482
Thanked 881 Times in 585 Posts
Default Re: Wico PR trouble

I've not stripped a magneto as yet but one thing I have read on this forum is that the magnets need a keeper put on them before you remove them.
It is a very good thing you have done by asking first before getting into more trouble.
There are many people on this site that will be able to step you through the process. Sorry I am not one of them but do a search of the site to see if it has been covered before or if a wiko ek is similar.
Reply With Quote
  #6  
Old 10-21-2019, 08:38:25 AM
IHCman IHCman is offline
Registered
 
Join Date: Sep 2017
Location: Stephenson, Michigan, USA
Posts: 37
Thanks: 1
Thanked 20 Times in 11 Posts
Default Re: Wico PR trouble

Thank you, I have much to learn about them, I just love that you can leave them sit for months or years at a time and there's no battery to maintain.
Reply With Quote
  #7  
Old 10-21-2019, 08:01:25 PM
dkamp dkamp is offline
eMail NOT Working
 
Join Date: Oct 2007
Location: LeClaire, Iowa, USA
Posts: 1,803
Thanks: 35
Thanked 1,001 Times in 638 Posts
Default Re: Wico PR trouble

There's lots to know about the dandy Magneto... and I know many things about them, probably more than most.

the one thing I know for certain, is that a man who owns a magneto test station, and has the proper tools to recharge magnets, rewind coils, and test condensers to find the proper one, may seem a little expensive, but he's WORTH EVERY PENNY.

If you want it to be trouble-free, pack it up carefully, and send it to a locally-recommended Magneto Guru... you will NOT regret it.
Reply With Quote
The Following User Says Thank You to dkamp For This Post:
  #8  
Old 10-22-2019, 01:23:42 AM
IHCman IHCman is offline
Registered
 
Join Date: Sep 2017
Location: Stephenson, Michigan, USA
Posts: 37
Thanks: 1
Thanked 20 Times in 11 Posts
Lightbulb Re: Wico PR trouble

Thank you all very much for the information.
Reply With Quote
Reply

Bookmarks


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

F o r u m Jump

Similar Threads Chosen at Random
Thread Thread Starter F o r u m Replies Last Post
IHC LB - Wico or IHC mag more trouble-free? joder Magnetos, Ignition Coils and Spark Plugs 1 10-06-2017 11:01:59 AM
Wico EK mag trouble FMEDave Hit & Miss Gas Engine Discussion 6 09-13-2013 10:34:16 PM
Trouble with Wico EK George NJ Magnetos, Ignition Coils and Spark Plugs 1 02-07-2009 12:06:21 PM
Mag Trouble Brad Franken Antique Engine Archives 2 07-20-2002 03:24:14 PM
Wico trouble on Witte W.D. McDonald Antique Engine Archives 1 11-24-2000 09:54:07 AM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 07:09:28 AM.

Smokstak and Enginads site search!


All use is subject to our TERMS OF SERVICE
SMOKSTAK® is a Registered Trade Mark - A Community of Antique Engine Enthusiasts
Copyright © 2000 - 2019 by Harry Matthews P.O. Box 5612 - Sarasota, FL 34277