by Warkton Tornado No.1 » Sat Dec 19, 2020 4:39 pm
There are very good reasons to filter the air to a carburettor, though I admit I am a 'convert' principally because of the mess created otherwise.
IMO some makes of carburettor are much more filter friendly than others. In my experience, the most common PH range of carburettors have a tendency to flood on a filtered, hot Lambretta engine, yet, with adequate, well designed air boxes, work well as OEM equipment on, say, a Honda Foxeye.
I am not clever enough to know why some carburettors struggle to breath when others function well. Even the old VHB converted to two stroke with later PH parts will gasp for air if just a 40 + mm elbow is fitted with not even a filter, so I'm not just being prejudiced against the PH range, though it is a fact that I consider their slide design wrong for a two stroke.
If you can overcome any tendency to bog or flood, no matter what the choice of carburettor is, there is money to be saved by persevering. Less fuel gets wasted to atmosphere & less fuel should get used. Allied to the fact that the engine should last longer through lack of wear cannot be underestimated, ultimately improving reliability.