I`ve got a Mountfield rotavator with a Lauson engine - lovely bit of kit that stands me @ £80 including having it repaired by a mowerman ( last year, as I needed it running quick . This year I looked @ the points because the top crankshaft oil seal had let oil into the points tray . Can`t have had more than a few hours use since it was made in the 60`s .( I bought it @ auction ) But as I want to get 20 years out of it I`m looking to get a replacement engine @ some point because even the techmuser techunstay - Red Indian engine that was apparently fitted to later ones - is pretty much obsolete too . What`s the best engine to look out for Cheers, Nige.