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Author Topic: can't get my Husqvarna 55 Rancher to spark  (Read 2315 times)

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Offline Megunticook

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can't get my Husqvarna 55 Rancher to spark
« on: June 01, 2018, 08:33:48 AM »
I bought a new Husqvarna 55 Rancher back in 2004, has always run great and I take good care of it. Moderate use (cut 2-3 cords of firewood each winter).

A few weeks ago it quit on me while in use, stalled after it was warmed up and I'd been using it for 20 minutes or so. I checked everything over and finally determined there was no spark. So I replaced the ignitor with an OEM and still no spark. I thought maybe the ignitor was bad, so I replaced with another OEM--no spark. I have the gap set exactly to spec., 3mm. I replaced the spark plug but no dice. I disassembled the switch to see if that was bad but everything looked fine. I cleaned the flywheel where the magnets are--nothing.

What could I be missing here? I'm usually pretty handy with engines and mechanical stuff (maintain my own vehicles, etc.) but this has me stumped. Could the flywheel be bad? A new one is $100, don't really want to replace that just on a guess.

How is the ignitor grounded? The mounting surface is plastic, but maybe the mounting screws thread into the metal block? I'm at a complete loss.

What further tests should I be doing? I'm about to give in and drop it off at a shop, but I hate to let this thing get the best of me! It's a pretty simple design, I ought to be able to figure it out.

Any ideas appreciated--thanks.

Offline Hilltop366

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #1 on: June 01, 2018, 09:00:22 AM »
Not much left to check other than disconnecting the kill switch wire and removing plug cap to check for spark. The spark should jump ľ" in the air but the spark with "newer" higher voltage ignitions should be a little blue snap and is hard to see in daylight so I try to check in a darkened area.

The flywheel magnets should hold a screwdriver which some resistance to pull off. I have never had to replace one on any saw before.

Still no spark, can check (with ohm meter) for open circuit or short in the coil primary and secondary coil circuits and short between primary and secondary. Don't know the specs but try google / youtube for more info.

Offline mike_belben

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #2 on: June 01, 2018, 09:05:49 AM »
Is the flywheel to coil pickup gap too large?  Slide in a business card, rotate the magnets to align with the irons and loosen the screws on the coil then retighten and roll it over a few times to make sure they still clear.

Any ripped pinched melted or nibbles wires?  Maybe under the carb rubbed through or something? 
Revelation 3:20

Offline Skeans1

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #3 on: June 01, 2018, 12:16:10 PM »
You said you stalled the saw every time Iíve done that Iíve sheared the flywheel key off, itís easy to check with an impact to remove the flywheel nut and a block with a hammer.

Offline Megunticook

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #4 on: June 01, 2018, 01:24:57 PM »
I checked the gap, set it to 3mm which is factory spec.

Ignition wire, boot, plug are all new. Tried removing the kill switch wire.

Don't believe the flywheel key is sheared--by stall I just meant that in the middle of a cut it slowed down and stopped pretty quickly. How would that shear off anything? And anyway it should still spark, right?

How is that coil grounded? That's the only thing I can think of that might be wrong--but where it mounts is plastic, so cleaning that wouldn't do anything...

Offline dougand3

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #5 on: June 01, 2018, 06:44:39 PM »
On a Husky 55 (or 50 or 51), the coil/ignition module mounts into the magnesium crankcase. So, if you're screwing into plastic, something is off. Maybe you have a Husky 455 Rancher. It has a weird shaped metal clip that connects a coil screw to the cylinder. 
Husky: 272xp, 365, 261, 61, 55 (x3)
Stihl: 036, 026, 011AVT
Poulan: 4218, 2000

Offline joe_indi

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #6 on: June 04, 2018, 09:29:10 PM »
Disconnect the switch wire at the ignition coil, it could be grounding somewhere.
A new plug need not always be a working plug. If you have any other equipment like another saw or a brushcutter or something use a working plug from one of those as a test plug.

Offline Megunticook

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #7 on: June 06, 2018, 01:47:15 PM »
On a Husky 55 (or 50 or 51), the coil/ignition module mounts into the magnesium crankcase. So, if you're screwing into plastic, something is off. Maybe you have a Husky 455 Rancher. It has a weird shaped metal clip that connects a coil screw to the cylinder.
No, this is the 55 Rancher, not the 455. Here's a picture of where the coil mounts. The mounting screws thread into metal sleeves in the plastic. Are these somehow grounded to the case? Could that connection somehow be broken?


 

Offline Megunticook

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #8 on: June 06, 2018, 01:48:05 PM »
Disconnect the switch wire at the ignition coil, it could be grounding somewhere.
A new plug need not always be a working plug. If you have any other equipment like another saw or a brushcutter or something use a working plug from one of those as a test plug.
I did disconnect the kill switch, also tried 2 different plugs.

Offline Megunticook

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #9 on: June 06, 2018, 01:50:03 PM »
You said you stalled the saw every time Iíve done that Iíve sheared the flywheel key off, itís easy to check with an impact to remove the flywheel nut and a block with a hammer.
If the key was sheared, it wouldn't be moving the piston when you turn the flywheel, right? Based on the resistance I feel when the spark plug is installed, I think the key is OK. But at this point maybe I should check anyway...I'm kind of at a loss here.

Offline dougand3

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #10 on: June 06, 2018, 04:00:49 PM »
In your pic, that's all metal. The coil screw hole will conduct to the cylinder. You can check with a multimeter - lead at coil screw hole wall and lead on cyl fin - probably 5 ohms or so. 
The flywheel key can shear just a few mm and flywheel seats back on the taper. It will still spark but spark timing will be real early - piston halfway up on compression stroke. The piston will move normally. All that said - that's not the issue here.
Sounds like the only thing left to be wrong is flywheel magnets. Never seen it but heard of them going bad or polarity change.
Husky: 272xp, 365, 261, 61, 55 (x3)
Stihl: 036, 026, 011AVT
Poulan: 4218, 2000

Offline Hilltop366

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #11 on: June 06, 2018, 05:19:36 PM »
Well if the coil is getting ground (test with ohm meter from coil laminates to cylinder).

Kill wire disconnected.

The coil gap is set correct.

The magnets still work.

Remove the plug cap and hold the wire ľ" or less away from the cylinder.

Pull the saw over fast enough.

Still no spark, you may have bought two bad coils.

Offline realzed

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #12 on: June 06, 2018, 11:23:34 PM »
Well if the coil is getting ground (test with ohm meter from coil laminates to cylinder).

Kill wire disconnected.

The coil gap is set correct.

The magnets still work.

Remove the plug cap and hold the wire ľ" or less away from the cylinder.

Pull the saw over fast enough.

Still no spark, you may have bought two bad coils.
Is it possible that the spark plug wire is grounding somewhere and got abraded along the way to the point where it finally started arcing when you were mid-cut?  

Offline Megunticook

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #13 on: June 10, 2018, 08:03:18 AM »
I tested for continuity between the coil body and the cylinder head--it was fine.

Regapped the  coil again to 3mm. Put yet another new sparkplug in.  No spark.

The only thing left I can think of to do is replace the flywheel. The magnets still seem strong, but I don't know what else I can try at this point. Hate to spend $100 on a guess though.

Maybe it's time to cry uncle and take it to a shop. Strange though--seems like a pretty simple system, ought to be able to fix it myself.

Offline decableguy2000

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #14 on: June 10, 2018, 09:54:37 AM »
Maybe I miss read what your air gap is 3mm. It should be 0.3mm about the thickness a business card.

Offline ladylake

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #15 on: June 10, 2018, 04:00:49 PM »

 Check the compression.  Steve
Timberking B20 12000 hours +  Case75xt grapple + forks+8" snow bucket + dirt bucket   770 Oliver   Lots(too many) of chainsaws, Like the Echo saws and the Stihl and Husky     W5  Case loader   1  trailers  Wright sharpener     Dino setter Volvo MCT125c skid loader

Offline steele109

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #16 on: June 10, 2018, 07:49:36 PM »
Hi I agree with decableguy2000 your air gap is too wide adjust it with a business card.All husqvarna 50-55 have a metal crankcase so grounding shouldn't be a problem.

Offline Megunticook

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #17 on: June 11, 2018, 07:07:12 AM »
I reset the air gap with a 3mm card that Husqvarna provides just to be sure it was exactly to specs. No change.

Either I got 2 bad brand new coils in a row (not very likely) or it has to be the flywheel.

Right?

Offline dougand3

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #18 on: June 11, 2018, 11:21:58 AM »
You can try an aftermarket coil for ~$10 online. Or a used coil & flywheel combo is $35. Check ebay.
Husky: 272xp, 365, 261, 61, 55 (x3)
Stihl: 036, 026, 011AVT
Poulan: 4218, 2000

Offline Skeans1

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Re: can't get my Husqvarna 55 Rancher to spark
« Reply #19 on: June 13, 2018, 12:06:16 PM »
I reset the air gap with a 3mm card that Husqvarna provides just to be sure it was exactly to specs. No change.

Either I got 2 bad brand new coils in a row (not very likely) or it has to be the flywheel.

Right?
Iíve sheared a flywheel key well still able to turn the crankshaft, your shaft is a taper fit so itís possible to lose time weíll still being tight.


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