Triumphrat

My '69 T100 just started to fire erratically on the primary side cylinder...it limps, then kicks in and scoots...limps....sometimes at low rpm and then sometimes at high....I changed the plug and the battery has a strong charge...It will not stay running on the left hand cylinder, (when I remove the other plug wire), but the right hand cylinder will run on its own...I have a boyer ignition and it has been running and idling beautifully as of late...

when it does kick in, it will keep firing as long as I keep the throttle the same, but a slight change and it will cut out again...also a lot of burping and backfiring...

I plan to check the plug wire in the morning and have a look at the valve settings, but does anyone know what would cause this? Is it the coil? Maybe a loose ground somewhere is robbing my spark?

Many thanks for any input.

Alright! Problem Solved!....it wasn't the carb (it is a twin carb head)...it was the plug wire, fortunately I had a new one on hand.

I did go thru the jets and bowl....only some mild grainy deposits, but that was a quick check so no harm.

I also forgot to mention that along with the erratic firing I had been hearing a subtle electrical 'crackle-pop' sound sometimes...probably a key indicator of some electrical related problems!

The wire that I replaced was the remaining wire of a set (the other had been replaced a while back), and it was a 'strange' wire...the type with the 'assemble yourself' plug end connection, perhaps these work just as well, anyways, the wire was somewhat corroded at the coil end, probably just old.

Lesson Learned: when cutting plug wires to length, always allow yourself enough length to be able to just swap sides with the plug wires to troubleshoot....or wait, is that a good idea? or is that not consistent with the timing settings? Is it better to actually remove a wire and install on the other coil to check, or can you just run one cylinder off of the other cylinder's coil and wire provided it reaches over?

Thanks people, this is a great forum.