ah i see.

well i've not heard about this issue before but it may be true on older style blowers.

this place refurbs the G-ladder blowers and you can pay a bit extra to get it flowed and ported:

http://www.stormdevelopments.co.uk/g...rbishment.html

you could ring them to see if it knacks up the G-ladder if its been out of use for a length of time.