by Warkton Tornado No.1 » Sat Apr 18, 2020 1:25 pm
IMHO, the only "non-standard" Dell'Orto's worthy of consideration for use with an air filter are those with a built-in anti-flood, which should point you in the direction of the VH range. If "adding drain holes" to the air hose will "cure" that issue with the PH range (as some people will tell you) then that is a cop-out.
Just because the PH range finds favour with road going Lambretta scooterists doesn't make them the best option.
I would advise you to consider other options & my current favourite (based on cost, ease of setting up & suitability for use with an air filter) is the PWK generic design. In general, though, knowledgable two stroke builders recognise that the slide should not be round as in a four stroke. The guillotine type is much more efficient.
Several companies associated with two stroke tuning have opted to manufacture the PWK under license. Included amongst them are Polini that fit them to their own motors for paragliding etc. Such motors must be reliable & capable of re-starting mid air.