So for a visual example, and who doesn't like dragbike pictures, Action Fours famous "2x4" twin engine dragbike (the color photo is on the magazine cover 1972) ran clearly K0 carbs. Most photos I have seen show the early Honda dragbikes running RC inspired Weber setups. Based on sheer numbers, the Weber carbs very likely had the most speed potential. But it appears that the K0s on the Action Fours bike were keeping up with a pretty respectable amount of power to be as competitive as it was early on.
RC Engineering in the earliest days, ran with retuned factory carbs until he went down the weber path(and Hillborn injection). Reportedly, some of the earliest Cobra engines used retuned factory carbs as it was the only option available.
So the question is... At what point does the K0-early 70s type carbs become the major restriction in a significantly hot-rodded 750 motor.
As a practical example(mine
) a 1000cc RC Engineering built 69 Diecast motor. RC ported heads, RC HD Springs, RC aluminum retainers, lightened and polished rockers, 1mm oversize intake valves, lash caps, and likely a change to either an RC #295 or #315 cam.
Is it fair to say that if the Action Fours dedicated (and successful) dragbike ran well on K0 carbs, my undoubtedly lower power output motor should run well on them as well? Not to delute the apple to apple comparison, but it is certainly possible that the K0 carbs on the Action Fours bike could have been custom bored to a larger throat, a popular racer trick back then.
George
