Ian,
the bike has the same symptoms (black spooge and hesitation at full throtle) as yours when you were trying to jet it right. It is confusing because last week opening half turn the air screw it improved things very much. And yesterday felt even better with an additional half turn out. Glenn is right about this liguid changing the mixture percentage of the fuel which might cause lean running. That's why today I try to reduce the antifreezing liquid amount and test.
On Saturday afternoon with the same jetting it was +3 about C and after a period of about 15 min with 2nd and 3rd gear tight tree driving I attacked a snow berm and gave full throttle in 2nd from the start of the berm. The bike coughed like crazy. Reduced the throtle and then I was able to accelerate pretty ok through the gears. I think this is a rich situation. Should I try the178 jet? The bike always starts first kick and works great if I keep the throttle at 80ยป90%.
Leon
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