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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-11-2012, 12:21 PM   #1 (permalink)
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No Spark: Gotta admit, I'm stumped

I was trying to explain this to SCBonneville and it had me completely tongue-tied trying to explain what's going.

My 2002 790 T100 (bike #1) lost spark. Cranks but no spark. I swapped the PVL coil for the stock Gill coil and still no spark. I next swap out the ignition module with a working spare that TTP reprogrammed. The bike (#1) worked great with the new module for a couple of short rides, and then yesterday it would not start. A quick check confirmed no-spark.

Again, I swap out the stock Gill coil and reinstall the PVL coil. No spark. I next try a Procomm igniter and I get a weak spark.

Next I try an igniter box from another 790 (bike #2), but before I do, I visually verify that bike #2 is sparking with it's original parts. I remove bike #2's igniter box and install it into bike #1 and still no spark.

I next try bike #1's igniter box, as well as the Procomm in bike #2 and both do not produce a spark.

Bike #2 now has it's original igniter box back in place and is running perfectly. Whew!

So I'm left with bike #1 with no spark from any ignition box, and 2 boxes that don't seem to work on any bike.

So you brainiacs, what do you suppose is the problem? The ignition module connector seems to be OK as well as the pins on the module(s) and swapping module #1 onto bike #2 would have ruled that out. The battery is freshly charged. I'm stumped.

/M
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Old 11-11-2012, 12:41 PM   #2 (permalink)
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Ignition pick up coil ?
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Old 11-11-2012, 02:34 PM   #3 (permalink)
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I was having problems a while back, with intermittent running on only one cylinder. I bought and fitted a Procom, and still I had problems but not as severe.

Turns out that when I was fitting the low tension coil connectors, one of them was loose in it's housing and it was being pushed out on fitting, leading to an intermittent connection. It's worth a look.
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Old 11-11-2012, 04:28 PM   #4 (permalink)
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The plot thickens! After a very pleasant ride on my #2 T100, and while the bike was still hot, I tried fitting the module from bike #1 again. Still no spark. I then fitted the reprogrammed spare module to bike #2 and the bike fired up. Oh goody... I was saving that spare module for a future build.

Since I have to pull the primary cover from bike #1 to fix some crash damage, I might as well pull the alternator cover and check the pick-up gap. The plug wires are fine.

This might be best answered by Pie-Man, but is it possible to corrupt the firmware in a Gill module and repair it by re-flashing it?

/M
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Old 11-11-2012, 07:54 PM   #5 (permalink)
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I maybe wrong but I think the oem box has some sort of protection for shorts and such built into it.What ever it is I have seen them do like yours did .But all the procoms I have had if they fry there done for good.You could have a short ( maybe in pickup wireing ) causeing the box to shut its self down.I did learn the hard way that if the plug is not tight in the procom boxes they become toast real quick.Allso check the main 30 amp fuse make sure it fits tight in the fuse box.
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Old 11-12-2012, 09:37 AM   #6 (permalink)
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Oh yeah, forgot to mention: My Procom unit is now dead (formally weak spark).

/M
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Old 11-18-2012, 09:27 PM   #7 (permalink)
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I'm having the same problem with my Bonneville right now. I'm writing this because I'm too stupid figure out how to follow a thread.
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Old 11-19-2012, 01:01 AM   #8 (permalink)
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+1 on the pick up coil. Forchetto has a fantastic post on testing these little beggars.

When mine went it was still testing OK, but since I'd swapped over coils/plugs/leads and CDI unit from a working bike (as you've done) I thought I might as well put in a new one since (like you) I was utterly confused and running out of options...
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Old 11-19-2012, 01:02 AM   #9 (permalink)
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+1 on the pick up coil. Forchetto has a fantastic post on testing these little beggars.

When mine went it was still testing OK, but since I'd swapped over coils/plugs/leads and CDI unit from a working bike (as you've done) I thought I might as well put in a new one since (like you) I was utterly confused and running out of options...
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