EVO All Evo Model Discussion

Ignition coil testing

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Old Apr 21, 2015 | 06:12 PM
  #11  
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Originally Posted by Dr.Hess
Why are you testing this?
Sorry, as new to forums as I am to wrenching
 
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Old Apr 21, 2015 | 06:36 PM
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Originally Posted by Harleycruiser
This terminology gets even mor confusing since several different ignition manufactures use reverse definitions from HD.
From twintec
"Single fire and dual fire refers to the number of times the spark plug fires during each four stroke cycle. The terminology is somewhat unique to Harley-Davidson® engines and is by no means consistently applied. For example, Custom Chrome Industries, one of the largest distributors of Harley-Davidson® aftermarket parts, uses the opposite terminology. Their single fire systems correspond to what most other companies refer to as dual fire. "http://www.daytona-twintec.com/tech_evo.html
Yep, I'm confused.
 
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Old Apr 21, 2015 | 06:56 PM
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Originally Posted by Harleycruiser
This terminology gets even mor confusing since several different ignition manufactures use reverse definitions from HD.
From twintec
"Single fire and dual fire refers to the number of times the spark plug fires during each four stroke cycle. The terminology is somewhat unique to Harley-Davidson® engines and is by no means consistently applied. For example, Custom Chrome Industries, one of the largest distributors of Harley-Davidson® aftermarket parts, uses the opposite terminology. Their single fire systems correspond to what most other companies refer to as dual fire. "http://www.daytona-twintec.com/tech_evo.html
most jap bikes are the same as harley with the wasted spark and it gets just as frustrating when trying to explain to a customer how cylinder 1 and 4 fire at the same time.
 
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Old Apr 21, 2015 | 07:39 PM
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Tell them it's just like a 97 Toyota Camry, 1 and 4, 2 and 3.

See? I had it right all along, just as long as you use the Custom Chrome terminology.


OK, stealthisthought. We need a tad bit more info. I'm going with "your coil is just fine." What kind of ignition system do you have? Some kind of aftermarket? Is it a Crane Cams that all sits inside the cone? (I will not mention here that Crane Cams, maker of that ignition went bankrupt, and that must have happened for a reason...) If so, that's your problem. Get one of those ultima or dyna's and you'll be good to go.
 
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Old Apr 22, 2015 | 12:39 PM
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Originally Posted by Dr.Hess
OK, stealthisthought. We need a tad bit more info. I'm going with "your coil is just fine." What kind of ignition system do you have? Some kind of aftermarket? Is it a Crane Cams that all sits inside the cone? (I will not mention here that Crane Cams, maker of that ignition went bankrupt, and that must have happened for a reason...) If so, that's your problem. Get one of those ultima or dyna's and you'll be good to go.
You are correct, it is a Crane Hi 4 ignition and Crane coil. The motorcycle division of Crane was sold off to S&S. They make a replica coil. The reason I think it's the coil is because I took it off the bike and tested it. See attached picture.
 
Attached Thumbnails Ignition coil testing-crane-coil-ohm-results.jpg  
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Old Apr 22, 2015 | 12:50 PM
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Getting a proper ground to test for the high voltage side can be a bit tricky. Also, you have two coils there in your hand. The probability of both high voltage coils going bad at the same time seems a bit low to me. What were the symptoms on the bike? Was it running on one cylinder or no spark on either? I'm still going with the module. Do a google on the site here with that ignition model and a few years ago there must have been 20 threads of that thing breaking. Yes, S&S bought them, but that was after the bankruptcy.

Do this: With the coil on the bike and all wired up, put your volt meter on one of the negative terminals and ground. You should see some fluctuations in the voltage as the ignition module grounds out the coil and opens to fire the spark when you crank it. If you see no fluctuations, the module is bad. An analog meter would probably be easier, but try different DC scales on a digital meter if that's what you have to work with.
 
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Old Apr 22, 2015 | 01:06 PM
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Originally Posted by Dr.Hess
Getting a proper ground to test for the high voltage side can be a bit tricky. Also, you have two coils there in your hand. The probability of both high voltage coils going bad at the same time seems a bit low to me. What were the symptoms on the bike?

Do this: With the coil on the bike and all wired up, put your volt meter on one of the negative terminals and ground. You should see some fluctuations in the voltage as the ignition module grounds out the coil and opens to fire the spark when you crank it. If you see no fluctuations, the module is bad. An analog meter would probably be easier, but try different DC scales on a digital meter if that's what you have to work with.
Symptoms: none really. Went to crank after bike was sitting for a few hours and flooded it. Drained carb, new plugs, realized it's not getting any fire. Was told it would have to be either the ignition coil or the ignition. Took the coil off to test. Ground I used on the high volt side; engine and even tried the ground in a receptacle. I have no idea what I'm doing. Had this particular bike exactly 1 week, I want to be on it and riding it. If it's the ignition, I wouldn't know where to start or how much to expect spending on a fix. Bummed out.
 
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Old Apr 22, 2015 | 01:23 PM
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This is not the end of the world. Carefully follow the steps necessary to diagnose the problem. Doc is one of our electricity gurus. He will lead you out of the woods towards the light. LOL
 
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Old Apr 22, 2015 | 01:31 PM
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Well, sucks to have things like that happen, but I have found that when buying used vehicles, there is always something that needs to be addressed. Even the used Lexus I bought from a Lexus dealer needed a few things.

When you say you used a receptacle as a ground, what exactly are you saying? That's kinda not possible. By ground, I mean the body of that coil where it bolts to the frame, or the motor with everything bolted on and wired up. Also make sure your meter is on a high ohms scale. It will show open if you use a low scale.

Confirm you are getting +12V to the positive side on that coil. Do the negative side test like I said. Then buy an ultima ignition and a different coil (the coil they come with is rumored to not be very good, but the ignition is said to be a good one.) You could even try the new ignition with that existing coil, as I believe it will do the non-waste spark configuration, but I'll defer that to the ultima experts. I run a Screaming Eagle ignition myself.

I mean what are you other choices here? Buy another coil and still not have the bike run, then buy a new ignition module? Also, there comes a time when you find you are in over your head and you should find an indy to fix it for you. I can't see them charging more than an hour labor plus parts.
 
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Old Apr 22, 2015 | 02:13 PM
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I think you're getting good advice on testing from Dr Hess, but I think you need to start over here. Have you actually confirmed no spark either with a spark tester or by turning it over holding the spark plug to the engine when you're attempting to start? Are all of your run switches in run and not stop? I don't see where you actually tested for a spark?

If you did and you have confirmed no spark at all from either plug, have you checked to make sure you're getting 12 volts to the coil?

Your bike might have a run stop switch that allows it to turn over and not fire either miswired or a user theft deterent type of switch. I've seen both on other makes. I'd check for a spark and power to the coil during ignition before I did anything else.

Is there a fuse anywhere that would need a check that would allow power to the starter and not to the coil?
 
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