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Spark Plug Wires

 
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h&jeuropa



Joined: 07 Nov 2006
Posts: 392

PostPosted: Sat Oct 31, 2015 7:08 am    Post subject: Spark Plug Wires Reply with quote

I was putting the plug wire back on one of the lower spark plugs and the wire just crumbled in my hand. It appears all the bottom plug wires are brittle and need replaced. Do I need to replace the upper ones too? All the wires are original, 650 hours on them.

I have gotten the old spark plug cap off and it appears reusable. The wire appears to be normal wire core spark plug wire that I can get at an auto parts house.

My question is how to get the old wire out of the ignition coil. I understand the wire twists into the coil like it does the spark plug cap, but there is tubing similar to heat shrink on the wire and over the end of the coil. The tubing seems to prevent "just untwisting" the wire from the coil. Do I cut the wire near the coil and slit the tubing to get it off? Can I reuse the tubing? If not, is it just heat shrink and what size? Do I need to purchase it from Rotax?

Can the wires be removed from the coils without taking the modules and coils off the engine?

The spark plug cap measures the proper resistance, so can it be reused? How do you measure the pull off force required? Is there a source for the caps that is less expensive than Rotax?

Thanks for your help.

Jim Butcher
Europa XS
Rotax 914 650 hours


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wanastuffit(at)yahoo.com
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PostPosted: Sat Oct 31, 2015 12:05 pm    Post subject: Spark Plug Wires Reply with quote

I would replace all upper and lower without question. All caps also. This ho you maintain a good running engine.
From: h&jeuropa <butcher43(at)att.net>;
To: <rotaxengines-list(at)matronics.com>;
Subject: Spark Plug Wires
Sent: Sat, Oct 31, 2015 3:08:43 PM


--> RotaxEngines-List message posted by: "h&amp;jeuropa" <[url=javascript:return]butcher43(at)att.net[/url]>

I was putting the plug wire back on one of the lower spark plugs and the wire just crumbled in my hand. It appears all the bottom plug wires are brittle and need replaced. Do I need to replace the upper ones too? All the wires are original, 650 hours on them.

I have gotten the old spark plug cap off and it appears reusable. The wire appears to be normal wire core spark plug wire that I can get at an auto parts house.

My question is how to get the old wire out of the ignition coil. I understand the wire twists into the coil like it does the spark plug cap, but there is tubing similar to heat shrink on the wire and over the end of the coil. The tubing seems to prevent "just untwisting" the


[quote][b]


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Dick Maddux



Joined: 24 Jun 2008
Posts: 515
Location: Milton, Fl

PostPosted: Sun Nov 01, 2015 5:47 am    Post subject: Spark Plug Wires Reply with quote

Jim
In my case I replaced the wires with Rotax 2 stroke wires from Spruce. I could not find any info that said the 2 stroke wires could not be used. They are much cheaper than the 4 stroke wires. Have had them on my engine for 2 years now. I replaced all the end caps with the exact same endcaps (per a google search of the cap number) at about 1/2 to 1/3 the price that Rotax charges. You can check the caps for resistance using an ohmmeter and decide if you want to keep any. In my case I just decided to replace all.
I also reused the tubing that goes over the wires. I shot a little Kroil under the tube and used a vice to get the tubing off. It wasn't easy but it worked.
The wires look nice and work great correcting a mis fire I was having.
  Dick Maddux
  Rotax 912UL
[quote][b] [quote][b]


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lcfitt3(at)gmail.com
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PostPosted: Sun Nov 01, 2015 7:52 am    Post subject: Spark Plug Wires Reply with quote

[quote][b] [quote][b]

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Roger Lee



Joined: 10 Jan 2006
Posts: 1461
Location: Tucson, Az.

PostPosted: Wed Nov 04, 2015 9:14 am    Post subject: Re: Spark Plug Wires Reply with quote

I would replace all wires. Do not use heat shrink tubing over the wire ends at the coil. This is not heat shrink tubing and you may have issues trying to use heat shrink. This other tubing is thicker and setup to handle the electrical discharge leaks from the coils. As Dick mentioned the plug caps if needed can be found els where other than Rotax.

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