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I know this one has been put out here before but this one has a twist in the tale.

Every now and again my bike starts up and runs on the left cylinder only. It can do it like 10-15 times consecutively and then stop for a while and the start again.
The twist is that after it warms up, anything between 2 and 15 minutes, the right cylinder kicks in.
If I stop for a short while and the engine hasn't yet cooled down completely, it starts up just fine with both cylinders running.
Any ideas?

I forgot to add that we cleaned out all connectors and CDI unit along with carbs etc.
Also, when I change spark plugs all work fine for a few days.


My 09 Speedmaster did exactly that for awhile, then self cured. You can't find what's wrong when it's not doing it anymore.



In a way, Ryk, I am glad it isn't self-curing because I am prepping the bike for a very loooong run and I would be suspicious of the problem emerging again in neighborhoods Triumph doesn't have a presence. Not that I scare easily but it is just irritating.
I normally just hang on until the second cylinder kicks in.
But that's not the way to run an effing ballroom.

Bedouin. Blessed are those eyes that have seen more roads than any man! (Homer).