by Warkton Tornado No.1 » Fri Jun 24, 2022 11:43 pm
I think that as the OP is interested in improving the filtration to a 22 mm OEM Dell'Orto generic carburettor, the OEM hose & airbox should be adequate, but once a certain larger size of choke is reached, then they will become restrictive. That said, it is my belief that some makes of carburettor are more 'filter friendly' than others &, of course, a free flowing exhaust will affect the adequacy of the whole inlet arrangement. An Indian alloy 175 barrel that I fettled with only a 26 mm choke couldn't run properly with an expansion chamber with the OEM filter & hose, or, indeed, with just the hose & no filter. With a DIY large elbow topped with a DIY foam filter it truly realised it's potential.