On going back to stock jetting- I've been doing more research, and based on the theory that the richness (indicated by the plugs) has been due to sticking choke plungers I'm not going to go back to stock jetting but will keep it at 135 & 138. Completely stock airbox and the Tyga pipes.
Respecting what Andy said about jetting discussion I’m just going to report what I’m doing rather than asking questions. My power jets came blocked. I feel inclined to unplug them as it's simply allows more fuel in when the revs are up. AMENDMENT: for the power jets to function properly some electronics must be connected, which, from what I've read are not with the MC18 so.....blanking screws are going back in. AMENDMENT 2: I don't see where the electronics can have anything to do with the power jets but I'm still going to put the blanking screws back in. Should anyone have had great success with taking them out on a stock MC-18 with pipes please let me know!
Should it then run a little rich- I have a spare air box top which I could, how you say, "drill 4 x 20mm holes in the front slope of the lid for best results."
