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Message: [QUOTE="Rich Rohrich, post: 1402818, member: 16241"] If your bike is really as finicky as you are describing I'd be inclined to think you have a scavenging issue because the transfer ports are poorly matched. Two-strokes from the 70's are notorious for having scabby transfer ports that cause all kinds of weird tuning issues. Just cleaning up the transfer windows with a right angle porting tool makes those old cylinders really come to life. The VM carbs just aren't that sensitive to weather changes. [/QUOTE]