Left exhaust pipe less hot than right one

Hi.
The bike has:
Pazon sure fire;
MA 6 V coils;
Champion n7y plugs;
Amal 930/7/8 carbs with all new pilots, jets and needles, etc..
The bike, on the stand, starts well at first kick but the left exhaust pipe after a while is less hot than right one.
The bike has good idle but the left exhaust has a mumble when you close the trottle from high rpm back.
I dont have used the bike on the road yet.
Thank you.
Piero

Original plugs were N3C
Original Coils were 12 volt MA12 when using original points.
Check your float height between each and then adjust your idle.
Check for air leaks at manifold / Amal's.
Good luck
Cheers,
Thomas

CanukNortonNut said:

Original plugs were N3C
Original Coils were 12 volt MA12 when using original points.
Check your float height between each and then adjust your idle.
Check for air leaks at manifold / Amal's.
Good luck
Cheers,
Thomas

Click to expand...

Hi Thomas.
The bike has the flat Commando new +0,20 pistons and the head has new brass guides and new valves worked.
So i have fitted the Commando plugs.
Pazon i know that prefers two 6v coils.
I also think that the left carb must be checked.
Thank you.
Piero

I would start by looking at the spark plugs Piero. See which cylinder is at fault ( one being too rich or one being too lean) then go from there.

Right carb opened much earlier.
Piero