Anyone With A 4cyl Trophy Do A Multimeter Check?

Chriss217

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Joined
Apr 16, 2021
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Age
69
Location
UK
My Ride
Triumph Trophy 1200 '98
Hi All,
I have a '98 Trophy 1200 that is badly missing on cylinder 1. With a contactless thermometer on the exhaust headers, cyl1 hardly gets warm whereas cyl 2,3,4 get instantly hot. Carbs have been cleaned, valve clearances checked, compression is ok. Plugs changed, pickup coil replaced, HT coils swapped over, HT leads swapped.
My workshop suggested changing the igniter, which I did with a Ebay igniter sold as "from a working bike". However this gives exactly the same fault misfiring on cyl 1. In case it helps the CDI igniter is model 1290072.

Checking with a multimeter for broken cables lead me to measure the resistances between ground/frame and the (LT) 4 leads connected to the HT coils. It appears 1 lead (White/Yellow), connected to the left HT coil (that sparks cyl1 and 4), measures 2Kohm to frame. Whereas the other 3 LT leads measure Meg ohms. Tracing the wires to the igniter plug shows both my old and replaced igniter measure the same.

Can anyone with a 4 cyl 1200 Trophy around '98, who has a multimeter and they have the tank off, could they do me a real favor by pulling off the 4 LT wires (ignition off), and simply measure the resistance between the 4 wires and ground?

Thank you to anyone who can help.
 
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