To have a pro rebuild a carby is usually about $350, so for this guy to "clean" the carby I'm not sure what he would have done. Ditto for remapping the dizzy too! I mean thats something you generally do with a high-power rebuild/upgrade. That being said, $250 is really nothing for a mechanic. I've had a simple $6 bypass hose replaced (I thought the problem was a leaking water pump) and it cost me $95 including labour.
39HP ATW - even for an stockish F8B is almost laughably high!
![Laughing :lol:](./images/smilies/icon_lol.gif)
That equates to roughly 29kw, which is the power a stock F8B has at the flywheel from the factory. I'd say that you either have a heap of modifications, or the dyno is reading on the high side.
Was the run done in shootout mode?