Yes I know. It's an MC18 and I've sat with a bottom-end richness that gives me grey hair at 26! The richness seems to foul the plugs bigtime and kill any spark after not even 50km's. I think I've got the oil flow volume ok now with only a very light blue-ness behind the bike. Hard accel stil leaves a cloud but I'm not willing to set my pump any lower than it is.

Anyway, the nr 6 plugs seem to be staying clean where 8's, 9's and 10's have let me down. I had a good run with B9EG, a plug that looks like the IX plugs, a thin little wire-like electrode. I suppose the spark temprature was hotter on these than the copper core ECM. The ECM plugs did'nt even last 25km and had me limping home on one cyl with less power than a 50cc.

At midrange the back cyl has a richness that sometimes momentarily kills it but top-end both cyls are running very good. Float level was too low on the front and you could feel the power drop away as it leaned out during a long WOT blast, plug chop confirmed this too.

SO, after some work, top end seems to now be in the stoic mark, midrange is kinda ok and bottom range sux major. All these problems wer taken care of when I tested the nr 6 plugs. They are also "P" plugs which means they have a protruding electrode. I've measured the clearance that the higher electrode front has from the piston face and it's ok, no collision risk.

What were those ratio's again? Three outward turns on the airscrew equals one slow-jet size down? The exhaust pulses at idle feel strong (thus rich, correct?) and closing the fuel tap for a moment, letting it burn the float chamber fuel, creates a leaning condition. This sends the rpm at idle to a max of 8000 after begining to drop away. Opening the tap again restores the situation to it's previous condition. I think theres a ghost in my engine or something cuz I've had all the jets replaced with new ones that are supposed to be stock sizes but no-go. Experimentation with hotter plugs is just an experiment.

The barrels' nikasil were re-done about 1000-2000km's ago for the first time ever since new along with thew pistons, rings and bearings. Could this have anything to do with my problem? I didnt own the bike before this major overhaul so I cannot compare, but I dont think it should add to the issue.