Hopefully you remember my ongoing problem with unburnt gas coming from my exhaust.  All of your feedback has been helpful and this is what i have done.  I only run on "Prime" and turn it off when I shut the bike down.  This helped dramatically but I still had some unburnt hydrocarbons.  Someone suggested that going to a higher octane might help a 90 or 91.  I did this with a 90 octane (possibly with some ethanol) using a NGK DPR8EA plug and the bike was riding better.  I took out the plug after a month and a half and the electrode was a health tan colour and not the black that I was used to.  I have just changed the plug to a hotter NGKDPR7EA since I am riding  on a small island and only in a few places can I get into 4th gear (1986 vintage).
I rode over to our next island where they have 91 octane to try that and put 9.8 litres into the tank.  Since I believe the Savage tank takes 9.5 litres plus some for the reserve I must have been sucking air as I got to the station.  Driving away to catch the ferry I noticed it was running like it used to (I did use 86 Octane gas from my own island pump cause I needed gas to get to the next island and I can understand that possibley the dregs of the tank where running throught the carb.)  That rough running is hard to describe it sounds like"PLUUT, PLUUT" I also noticed that when I started it up in the morning it spewed more unburnt hydrocarbons but not as much as it used to.  Today I took it for a run and it was running fabulous!!  It's sound was like a octave higher and going "PLET, PLET".  (Sorry for the weird sound affects.)  So somehow I think part of the problem has been the quality of gas I have been using.
I have noticed though when in 4th gear and cranking it open I hit a point where it feels like it has changed into 5th gear with a power surge.  Can this be because of the UFO on the new carb that I installed that I got from Lancer?  
Also is there any problem in running 90 octane?  It seems to prefer it and does not seem to overheat.
DocNeedles