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A valve adjustment could also cause an odd idle. The pregen is scheduled to have valve adjustments at 600 and then at every 6k miles.
On the pregen petcock there is no "prime" setting so you will need to apply a vacuum to the second hose in order to simulate the engine vacuum. Suck on the hose or use a mittyvac.
Also check the tension on the choke cable. If it is too tight, turning the bars would cause the cable to tighten, thereby richening the mixture. That would also cause the rpms to rise during idle in most situations.
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Track Day Preparation Checklist
1. Financial 2. Mental 3. Physical 4. Gear / Bike
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