Could someone post a photo of a spark plug with color for ideal mixture strength

I a tally have one! That could help me see how the two cylinders vary. I will install the new choke plunger before doing anything more.
Might be 2 weeks to arrive.
 
DennisMo said:
Many thanks.
With my Mikuni I am running to rich at low rpm and have sooty plugs.
If I lean out the low speed circuit to get rid of the sootiness, I get lots of exhaust pops on
overrun and when bike first started from cold.
The idle air screw is about 1 1/4 turns out from its seat to stop the popping.
So I thin this tells me it is time to go for a larger size idle jet
I am going to change the idle jet to next size up before reporting back
Thanks again
Dennis
Click to expand...
Make sure the idle air jet is no bigger than a #1.1. If your kit came from Sudco (now defunct) they had #2 in them which would soot the plugs at low RPMs and throttle openings.
 
New plugs into a warmed up engine, Riden abut 3 miles, then 4000 RPM held
steady for about 1mile, Plug chop/engine killed with switch, and coast into garage. fuel93 pump gas with 10% ethanol. This is from my CHR MK3, a very fast Commando, it is tuned to a T.
 

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