Tell me about it .
Was not idling too long. Went to top off the tank with fuel and stabilizer before putting it away. I did let it idle a bit just to make sure stabilizer got into the carb. Only a 5-10 minute ride.
They are DPR7EIX-9 iridium plugs so gapped properly.
Again, on the 35 they were pure white, so went to the 40 about 30 - 40 days before it went away. This is why I am thinking that the 40 is just too much. Just based upon plug reading 37.5 is where I most likely should be.
" They are DPR7EIX-9 iridium plugs so gapped properly"
Just because they are NGK IR plugs it doesnt mean they were gapped perfect from mfg.
Gap ngk recs for that plug for our bike on thier website is .035" which is top end of yami
spec and when i installed the same plugs in my 06 silverado i found 3 of 4 of those same plugs to be wider then .035" spec brand new out of the box.
Thoe 3 plugs were approx .038-.039" and had to adj ground strop a bit to get them to proper .035", so chk them out
Dave J said your plugs look to be wider then then std gap spec which seem too look a bit wide in the pics to me too so chk them out.
And while your at it spray some carb cleaner on/into the plugs to try to loosen up & romove some of the carbon on the plugs because they are close to beng fouled due to excessive carbon from running too rich.
Could also use an old school spark plug sand blasetr too which will do a good job cleaning them but you have to ensure you use 100psi or more comp air to blow out residule cleaning media from threads on plugs and from deep inside where ceneter porcelin is along with some braclean and or carb cleaner too.
The old school plug cleaners do a good job cleaneing fouled plugs but you must ensure that post blasing/cleaning the plugs are properly cleaned/sqeeky clean inside and out inc the threads and gap checked prior to reinstalling them because if theres any residule blast media left on or in the plugs it could get into cyl-s scratching them leading too oil use & eventual engine bore job,new piston & ring too.
And just curious,what mpg were getting running on righ side?