This is interesting - Yes the motor unit was mine and so are all the mods made to it. - fuel vent prevents fuel s*removed by admin*, bigger 10Ltr fuel tank, changed throttle with rev counter, smaller air intake to ensure better airflow, changed hang point, increased compression ratio & altered timing and exhause system (the latter was so bad on the original it would fail on each flight).
This was an 80cc unit (prev units were 66cc water cooled). via a 4 to 1 gearbox.
The address you had in Croydon was indeed correct but I moved to Eastchurch on the Isle of Sheppey in Oct 2007.
If anyone wants my info email me and I will supply my full details.
I hope my old unit gave good service because it did with me - it was my 4th unit and I was pleased with the good power to weight ratio as when I started it was the good old Solo agricultural lump most used and a small lighter lump can give the BHP if you gear it right and use the right prop pitch.