Antique Engines and Old Iron
[Home] - [HELP] - [Forums] - [Library] - [Photo Gallery] - [Groups] - [Classified Ads] - [Subscribe] - [Links] - [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

Wisconsin, unknown twin, weak spark on one cylinder


this thread has 9 replies and has been viewed 3180 times

Reply
 
Thread Tools Display Modes
  #1  
Old 01-04-2012, 02:49:18 PM
Cheddarpecker Cheddarpecker is offline
Registered
 
Join Date: Jan 2012
Location: Odessa, Texas
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Default Wisconsin, unknown twin, weak spark on one cylinder

Howdy, y'all. I'm stuck in a hard spot. As I sit, I'm on the roadside reading all I can on a connection from who knows where.

The engine is down the street in a Ryder truck outfitted to blow in wool insulation. I think it's a TF or TJ, but as far as I can tell, it's a parallel twin with magneto. The mag has HK on the side of it above four digits I don't recall offhand.

I've replaced the cap, which was cracked, plugs, wires, the rotor, points, and condenser. Without specs, I eyeballed the points at about .015 and it came right online.

Watching the spark testers, the cylinder towards the PTO side is not firing much at all. Yesterday, once I was finished, I had the same result, but out of nowhere it started firing pretty regularly, but still intermittant. Lots of popping out of the exhaust.

I start it today after making a set of solid copper wires for it, and right from the start that rear cylinder is near dead. The front shows a bit of a miss as well.

The thing looked fine on the inside, everything was tight when I put the cap on.

Somebody here must have had a similar experience, or knows exactly what I've done wrong, or have yet to do for that matter. I'm fairly adept, have an adequate tool box, and should be able to comprehend any advice given. I'd sure appreciate it, and so would the guys. They've got a customer waiting on me, and I'm about at a loss.

Thanks, and thanks again.
Reply With Quote
Sponsored Links
  #2  
Old 01-04-2012, 03:54:51 PM
Pat Barrett Pat Barrett is offline
Subscriber
 
Join Date: Nov 2004
Location: Brookhaven, Mississippi, USA
Posts: 2,683
Thanks: 689
Thanked 1,638 Times in 990 Posts
Default Re: Wisconsin, unknown twin, weak spark on one cylinder

Wisconsins are bad about valves sticking, is set very long. You may not have a spark problem, but a problem with a valve sticking Check the compression on both cylinders with a compression tester before you go any further. You don't say what the sprak plugs look like.
Reply With Quote
  #3  
Old 01-04-2012, 04:30:09 PM
Phil P Phil P is offline
Registered-III
 
Join Date: Dec 2008
Location: Okeechobee, Florida, USA
Posts: 1,022
Thanks: 1
Thanked 616 Times in 307 Posts
Default Re: Wisconsin, unknown twin, weak spark on one cylinder

Hi

Not an uncommon problem.

First I need to know witch magneto you have. When you removed the cap was there a distributor type rotor.

Send me a PM and I will give you my phone number.

Phil P
Reply With Quote
  #4  
Old 01-04-2012, 05:02:25 PM
Cheddarpecker Cheddarpecker is offline
Registered
 
Join Date: Jan 2012
Location: Odessa, Texas
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Wisconsin, unknown twin, weak spark on one cylinder

Quote:
Originally Posted by Pat Barrett View Post
Wisconsins are bad about valves sticking, is set very long. You may not have a spark problem, but a problem with a valve sticking Check the compression on both cylinders with a compression tester before you go any further. You don't say what the sprak plugs look like.
Have yet to check the plugs, as they're new. It'll be something to check when I get back to the engine.

I confirmed the intermittant spark by connecting the weak plug wire to the block with a spark tester in series. Same result.

I have, however, noted that the throttle shaft shows a good bit of wear, and that mixture problems will soon follow after taking care for the spark situation, and a bit of use.
Reply With Quote
  #5  
Old 01-04-2012, 06:08:51 PM
Cheddarpecker Cheddarpecker is offline
Registered
 
Join Date: Jan 2012
Location: Odessa, Texas
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Wisconsin, unknown twin, weak spark on one cylinder

Okay, the plugs look great considering one is only firing a fraction of the time.

The engine is a TJD, I was able to make it out, but the tag is in a tight spot.

After adjusting the points, I've came back to the same conclusion.

Here's some pics I took. Can anyone tell me where the rubber and the washer are supposed to go? They were absent when I took all of this apart.





Reply With Quote
  #6  
Old 01-04-2012, 06:26:30 PM
DCamp DCamp is offline
Subscriber
 
Join Date: Feb 2007
Location: Cookshire, Quebec, Canada
Posts: 329
Thanks: 21
Thanked 129 Times in 99 Posts
Default Re: Wisconsin, unknown twin, weak spark on one cylinder

Have you tried it with the kill switch disconnected? I have seen a bad switch do strange things. But do check compression. On our older engines we had to give the valves an extra 2 thou. on the adjustment.They would too hot and start to leak by the end of the day. Good luck.
Reply With Quote
  #7  
Old 01-04-2012, 06:58:51 PM
RSCurtis RSCurtis is offline
Registered-III
 
Join Date: Jul 2009
Location: St. Thomas, Pennsylvania
Posts: 801
Thanks: 0
Thanked 257 Times in 222 Posts
Default Re: Wisconsin, unknown twin, weak spark on one cylinder

I'd like to see a photo of the inside of the cap to see if the terminals are 90 or 180 degrees apart. For you Wisconsin experts, how does a magneto with a direct drive rotor work on a TJD? Can it generate a spark in only 90* or rotor rotation?
Reply With Quote
  #8  
Old 01-04-2012, 09:10:46 PM
Tom Martin Tom Martin is offline
Email Not Working
 
Join Date: Aug 2006
Location: Inman, South Carolina, USA
Posts: 1,314
Thanks: 115
Thanked 627 Times in 427 Posts
Default Re: Wisconsin, unknown twin, weak spark on one cylinder

The Wisconsin TF fires both plugs at the same time, and you can switch the plug wires with no change in engine operation. I believe that on the TJ, the cylinders don't fire at 180 degrees, so that the mag is different.
Reply With Quote
  #9  
Old 01-04-2012, 09:29:10 PM
RSCurtis RSCurtis is offline
Registered-III
 
Join Date: Jul 2009
Location: St. Thomas, Pennsylvania
Posts: 801
Thanks: 0
Thanked 257 Times in 222 Posts
Default Re: Wisconsin, unknown twin, weak spark on one cylinder

The TJD fires at 180 and 540 degrees of crank rotation. The TH and older engines fire at 360 and 360* I was curious how a magneto produces a spark with only 90* of rotor rotation. If that engine is indeed a TJ, the plug terminals in the mag. cap should be 90 and 270 degrees apart. That's why I was curious to see the inside shot of the cap. This may be another situation that was discussed here recently where a member had a TH distributor cap on a TJ engine.
Reply With Quote
  #10  
Old 01-05-2012, 07:36:04 PM
Cheddarpecker Cheddarpecker is offline
Registered
 
Join Date: Jan 2012
Location: Odessa, Texas
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Wisconsin, unknown twin, weak spark on one cylinder

Well, the machine went back to work running on one cylinder. A lot of posts I read, people said the engine ran fine before the trouble started, and indeed it will run well enough on one cylinder for a while. I'm leaning towards the coil, but may also be converting it to the battery coil distributor from the previous engine.

I'll be back when I get back to the engine. Thanks, everyone for your insight.
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

F o r u m Jump

Similar Threads Chosen at Random
Thread Thread Starter F o r u m Replies Last Post
Wisconsin TJD no spark on one cylinder Floyd KY Wisconsin Engines 45 11-21-2011 02:40:00 PM
Maytag Twin: weak spark Lvolling Maytag Engine Collectibles 14 03-09-2011 02:13:07 PM
Unknown twin cylinder mag Billy Purves Magnetos, Ignition Coils and Spark Plugs 2 04-27-2010 09:32:30 AM
Weak spark for sure Elwood Antique Gas Engine Discussion 1 05-17-2009 11:18:07 PM
Weak spark - Help Nathan Antique Engine Archives 2 03-09-2000 02:32:34 PM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 04:07:48 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 - 2016 by Harry Matthews P.O. Box 5612 - Sarasota, FL 34277