| spark plugs
advice to a newbie please- i have a 91 900ss (white frame model) with 40k on the clock. went for a run on sunday (120 miles) and checked the plugs and they were black. I noticed that they are ngk dcpr9ea9, the equivelant of the recommended plugs wolud be dcpr8e. Would the colder plugs i'm using cause them to be a bit sooty?. Also she backfires a bit through the left exhaust on the overun when cold (1st 5 miles say) - is this normal? Bike has just had the valves and belts done at Veloce in norfolk | 
Threaded Mode