Reading these innumerable threads about people pulling their listeroids apart to clean out the sand, replace this, adjust that, I can never understand the apparently widespread reluctance to purchase an original Lister and rebuild it. Everyone says they don't have time for a "project" and then they rush out and buy one!
It's almost as though the "bait" of "ready to run" is irresistable, even when the most cursory research must show that these engines are made by the uknowing working for the uncaring, and who knows what sins the filler and paint conceal, because QC might as well stand for "Queen Camilla" in Rajastan.
Buy a real Lister and rebuild it so that you have a KNOWN and PROVEN QUANTITY that can be relied on for thousands of hours to come - if you do the work properly.
Scuse my little rant there!