My guess is that it takes off in reverse due to steeper gearing. It isn't making the necessary torque to take off in a higher gear.
I'm betting that the stock exhaust is very restrictive and that the carb is set up quite lean.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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