Aye Colin,
Paddock Gossip! The Eldert 500's cylinder head apparently has narrower valve angles than standard, machined from solid and the cylinder capacity is a full 500cc. It also has a 6 speed gear cluster and putting out a reputed 62bhp at the back wheel. That is similar to a good Yamaha XT600 race engine. A comment in the paddock was "Not much of the engine ever saw Italy"! Usual paddock bitching/politics.

However, achieving a 11th place as a Newcomer, with a lap speed of over 100mph, proves that Jeffery Vermuelen is no slouch and hats off to him. I also believe that he was riding a Ducati 350 as well, but against the Honda 350 K4 Armarda, had a tough time. Whatever the why's and wherefores, the winning NZ Norton ES2, the 2nd place RE 500 Bullet and the 3rd place Matchy G50 in a Seeley frame, would all be using heavily modified engines, with modern pattern castings, rather than modified OME castings, due to the stresses of racing and general wear and tear. But it is good to see the pushrod singles beating the twins and Manx OHC engines.
Tom Snow was also racing a 450 Desmo in the Historic Senior and came a creditable 13th, running a Gardener carb that ran rich and whilst in practise was running up the Mountain Mile in 5th and pulling well, come the race decided to sulk and would only pull 4th at 8,000rpm up the Mountain Mile on the same gearing! Achieving a 98+ mph lap speed. Running a 450 engine at 8,000rpm, would I suggest test it's reliability. I don't know what the engine condition was after the race.
Both riders have bigger nuts than I do and hats off to them both. How much longer the Mountain Course racing will continue remains to be seen? What with all the politics and a lack of volunteers to Marshall the events, time will tell.
Good health, BillR