Thanks for the help and advice everybody.
Wrench, should I use the 0.6mm base gasket on just the front, or on both next time?
Triman5, do ever find you have to change jetting for conditions/weather?
Looks like I'll have to build up very gradually to the plug chop in future ... I think I didn't make myself clear, I haven't checked the rear cylinder yet but I am assuming it is in the same condition as the front. So I'll be looking for a pair of used cylinders and I'd very much like to know the difference between the cylinders from different models since the new price is so wildly different.
Do you think these would do the trick?
http://page.auctions.yahoo.co.jp/jp/auction/73193148
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MC28 SE -sold-
MC21 with RS250 engine -for sale-
MC21 race bike -soon for sale-