Originally Posted by onnetz
more tuning options isn't necessarily a good thing.. more chances to screw things up..
Very true, its hard enough getting a 3 needle carb tuned. Now once your done with that youll be asking yourself more questions about the powerband. But normally its a double edges sword. There will be very experienced engine tuners that will love this and hopefully they will give some reccomendations on whats good for what and so forth.
Usually with most crazy setups , there are a few who really sit down and figure it out for us. Hopefully that will happen with this motor.
The timing shims said they can change how much power comes on and the more shims the higher the power comes later in the rev range.
For the needles you can get a more progressive power (which is like thinking in multiples). Linear power is smooth , continual , straight lines. Where progressive is like an earthquake or quarter mile , growing. Where its not in steps but multiples.... I love the term progressive and linear...lol. As well as exponential.
Then the venturi for the carb can give you better low-end response and a more refined moving air flow. Normally sacrificing a little overall top-end power. But usually at good sacrifice to good drivability and easier to tune sometimes.