excellent Jon, thankyou very much.Jon wrote:From Dellorto's manual, who have a pretty good handle on tuning slide type carburettors;
"The atomisers fitted to Carburettors intended for four-stroke engines are manufactured with different types of side drillings because the positions of these holes affect acceleration response.
Atomiser holes positioned high up cause a weakening in the mixture since they are above the float chamber fuel level and only let air in; conversely,holes lower down cause mixture enrichment because they are below the chamber fuel level and draw fuel from the well to the barrel.
The result is that, to weaken the mixture under acceleration, atomisers with holes drilled higher up are required, while to enrich the
mixture, atomisers with holes lower down are needed. The holes' diameter determines how long the well takes to empty and it is
therefore also necessary to select a suitable size."
Atomisers = Emulsion tube
If it is running rich in the 6 to 10k range I would have thought you were still looking for a needle that is thicker in the tip or dropping it down a notch.
regards
jon
Without having some needles machined...im probs stuck with the ones i have.
The problem with them... they are longer than standard needles( great we thought, will lean it up a treat)... but we are on the middle clip, go any lower and it gets richer...
Id like to get them to work somehow because we are getting great peak power out of them. I think i will experiment with some spare emulsion tubes.thanks again
