Just did a plug chop after a 25 mile ride and would like to ask for opinions on what the plugs are saying please. This was a brand new set just fitted to the bike. I am not an expert but it would appear to me that 1 and 4 are running a bit lean, 2 is rich and 3 is not too bad. All 4 have black around the base of the threaded part. Does this mean anything?
Many thanks in advance for all comments. Cheers. Sean in the UK.
Many thanks in advance for all comments. Cheers. Sean in the UK.
