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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Electrical - Battery, Charg Sys, Lights, Switches, Sensors & Guages » Archive through October 17, 2009 » S2T rear cylinder dies when hot then starts up fine when cool « Previous Next »

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96s2t
Posted on Sunday, September 13, 2009 - 12:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have owned my 1996 from new and never had problems with it dying or leaving me stranded until yesterday.I rode for about 50 miles then it started to run badly. Lots of fuel at the petcock. I pulled the rear cylinder plug and grounded it out on the frame and I had no spark. Did the wire checks, pulling apart the connectors and inspecting them then pushing them back together. I have a Compu fire aftermarket adjustable ignition module that I checked the connetion on too. Looked good. I started it up and it ran fine for about 2 more miles then the exact same rear cylinder misfire. I have those hoaky L.E.D. sparkplug caps so I could actually see that there was no spark on the rear cyl. I got to my destination and let the bike cool down for a few hours, started it up and ran fine for 15 miles then the same thing. It quit about 7 times on the way home. The longer I let it cool down the further I would ride before it would die. I believe it is something electrical like the ignition module or a timing sender unit or something that fails with the heat. Has anyone ever had this problem and what was the fix?
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F_skinner
Posted on Sunday, September 13, 2009 - 01:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My first guess would be the coil and it is most likely the easiest thing to check. Coils really are not prone to go bad but they do from time to time. I would replace the plug wire first.
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F_skinner
Posted on Sunday, September 13, 2009 - 09:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Check the resistance in the primary and secondary windings.
The primary is checked using the +ve and -ve terminals of the coil. The secondary is checked using the spark plug cable attachment points.

The primary should read approximately 1 Ohm, and the secondary around 12.5K Ohm.
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96s2t
Posted on Tuesday, September 15, 2009 - 04:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Had a go at diagnosing the problem yesterday. It started up fine when cold. I stole the wife hair dryer and heated up the timing pick up (under the timing inspection plate). Heated it for a good 10 minutes and it still started up fine. Next I heated up the Compu-fire aftermarket iginition module the same length of time. It wouldn't start at all. I cooled it down and then it started up fine. Bad iggy module. Anyone have a favourite aftermarket plug in module? Any ones to avoid? Thank you all that responded to my post.F_skinner....thanks.
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F_skinner
Posted on Tuesday, September 15, 2009 - 06:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Glad you found the problem. I have heard good things about the Dyna ? ignition but I have never used it so do not know for sure.

Frank
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