Looks like my memory failed me anyway; it was the primary gears that were modified:
"Tuning article from Aad van der Valk
Minus de Vries is an experienced tuner of Nuovo Falcones. He was the owner of a Motoportbikeshop in Wormer which is now run by his sons because Minus is 65+ already. Some years ago he saw a Nuovo Falcone and some ideas were born. He went to Italy and bought a couple of old, rusty not running NF�s for a few hundred pounds.
The photo, was made by me on the 25 anniversary of the MGCN and at that time in 1997 I did not know then that should met Minus a little later. It looks like a NF but I can assure you that perhaps two or three screws are still original besides the hardware on the OUTSIDE of the engine. Minus was willing to tell so much about the machines (there were three of them .) that it is a pleasure to just listen to this impassioned man.
He showed us, for example, the weight of the machine. He put a scale under the front wheel and under the rear wheel and together the result was ... 120 kg! This is nearly 100 kg less than a standard NF.
At that time he had just reworked the machine and was a little surprised himself too.
After some time he revealed the secrets of his ability�s. Everything but then he meant everything had been close-looped to reduce the weight. He showed me a crank-case in which the inside had been securely drilled out and all walls thinned in order to lose weight; primary gears with aluminium centers and the original gear teeth as a circle shrink-fitted. A reworked crankshaft, special piston, own made and designed camshafts, light valves and springs, rockers and push-rods, reworked head and a tuned 36mm carburettor
.
He told me that in the veteran races some 3-cylinder Yamahas must go to the limit to pass him after a few rounds.
I think the racing talent of Minus, he races the machines himself together with his brother Henk, is quite a contribution to this but never the less it shows the incredible capacity of the one-sparker (oh, sorry these NF�s have two sparkplugs). He does not know the number of horsepower but when he says that the machines do 200+km . I believe him rightaway.
In order to keep the special look a hand made aluminium, chromed, flywheel is still fitted."
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