Hi Kjell, my e mail is ianholliday1@ntlworld.com I thought of something, when i pulled the carbs apart i didnt touch the air correction/mixture screw, then i thought that these were set to the original restricted inlets so surely these should be reset to match the new inlet rubbers ??. The screws were set at 2 1/2 for one side and 3 1/4 for the other compared to 2 1/8 base setting. i've just got a set of vacuum gauges so i can balance mine and set mixture. failing that i have off e bay for £25 a set of 4 coils (from an rd04 as the one i bought from honda superseeded to a 750 coil anyway. i also have a compression tester to check engine compression. failing all this i have roadkills carbs in front of me, he very kindly sent them to me to try, so i can try those and see if any of the above makes a difference ?? thanks again Kjell. i'll use your specs on my carbs and go from there. fingers crossed. thanks again kind regards Ian