53 plate 1150 GSA left pot heating up

[Rev Chuck]

I, as those of you who know me, am not a mechanic. So...
Bike starts and idles correctly, c. just over a 1000rpm.
left hand cylinder heats up almost instantly and the bike is running "lumpy".
I recently had a stick coil replaced on that left hand side as there was no spark.
As the engine gets hotter, the idle speed increases to around 2000rpm.
There is a distinct petrol fume from the exhaust as the bike is running.
My thoughts are to check injectors are working... Can I swap sides to check the heat issue doesn't transfer to the RHS cylinder head?
then check valve clearances and carry out throttle body balance,
but before I go into all of that I wanted to check incase there was something else I was missing.
'53 1150GSA. Appreciate any help/thoughts... Thanks

 

[theoneandonly]

do the basics first tappets , plugs ,t/b balance.

 

[sproggy]

And check that the throttle cable is properly seated just below the tank on the right hand side. If not that can cause all sorts off weird running issues.