- Sat May 20, 2017 1:59 pm
#67826
From your trials of different carbs you have shown that your original throttle valve is too lean at 2.5 and you need the richer 2.0. Either you need to persuade your friend to sell you carb number 2 because what he REALLY wants to do is to upgrade to an AMAL Monobloc, a Dell'Orto or a genuine Mikuni, or else just buy your own number 2.0 throttle slide.
You mentioned swapping air filters a while back. Although simply relocating the filter would probably not have any effect, if your old air filter was more restrictive than the one you have now, the leaner 2.5 throttle slide would have been better for the old filter. But if your new filter lets more air through the carburettor, the previous settings are now TOO lean, which is why, when you substitute a richer 2.0 slide for the original 2.5, the correct mixture is restored for that part of the throttle opening range.
Carb number 3 will make a nice paper weight
A.
You mentioned swapping air filters a while back. Although simply relocating the filter would probably not have any effect, if your old air filter was more restrictive than the one you have now, the leaner 2.5 throttle slide would have been better for the old filter. But if your new filter lets more air through the carburettor, the previous settings are now TOO lean, which is why, when you substitute a richer 2.0 slide for the original 2.5, the correct mixture is restored for that part of the throttle opening range.
Carb number 3 will make a nice paper weight
A.
