not to open a new tread........81 cm400t vb31 carbs put 118 instead od original 110 sec jet
having similar issue, one of the plugs looks identical fouled dry soot (right cyl - throtle hand side), the left little better but still not as should be (tan brown)..the day before yesterday went on a 200+ km ride on highway and it ran so well i couldn't believe it, but on arrival when checked plugs for curiosity, were all dry soot; prior to that ride, replaced the plugs with new ones! Carbs cleaned few days ago and you can tell the difference in power and response from before..
so I messed with idle screws yesterday after riding a bit (working temp) as thought it was too rich so wanted to make it a bit leaner, were 2-2,5 out the day before..now, seated, turned 1,5 out from seated, and when i make it leaner from there it doesn't idle like before,
lower throttle response, slower return on idle rpm, sputters or backfires!?(dont know the term sorry
...so if I increase the rpms, running it richer and better I suppose, I guess will have fouled plugs again..didn't check but will do that..so what am I supposed to do, as it seems cannot make it in the middle..