We do not know if there ever was a Nassetti 4 stroke/50 cc. Racer, but we saw, special
cam- shafts and high pistons for Nassetti, so we think they have tried to increase
Sery motor. So the idea came up to see if it would possible to turn back the clock
years and make a racer of a standard Nassetti Sery, for real racing. Together with
Sery motor block, we also had bought a Sery frame. Thus,building a racer seems to
possible. The intent was there, but, could we do it? The only things we had were,
back-bridge, motor, a pair of wheels (not mounted), and a handlebar. Not much to
racer from 1955. Several things were clear:the final Nassetti must look like a racer
1955, and it had to be safe. Therefore, the spring action had to be good as well.
had to have enough capacity. There was still one requirement, a lubber of 1.85 m.
ride the bike, so it has to fit.
We learned one thing, while building the street Nassetti, first of all gather all
the things you
need. Make everything mountable and ready, also the welder works. Then, put everything
together as if its the final mounting. Check everything, to make sure its working
carefully at your sitting position, for you can put too much stress on the handlebar,
the gear is at the handlebar. The foot brake pedal had to be placed in such a way
can reach and use it without looking. And if everything goes well you can go to
with the things that have to be painted. But that cost a lot of time.
Lets start building, first things first, and see if we can get the Nassetti ready
The beautiful Italian front wheel turned out to be better than expected.When we found
the correct front frame it was easy to fit after several adjustments. The front frame
new and (double) oil quenched. To mount the front fork we had to cut the ball head
The front fork is made in Italy. The very small fuel tank fits very well at the front
frame, we only had to weld a small tube at the frame and put some rubber grommets
on it so that the tank can seat on it.
It was different with the back of the tank. This has to be fit at the racing saddle.
side of the frame there was nothing to hold on. To resolve this we had to work with
sorts of shackles. We decided to let the race saddle and the back of the tank lean
one aluminium sub frame. First we made a model out of cardboard, put the U form
cardboard on a aluminium plate and fret-sawed it. After drilling the holes we went
a sheet metal worker to put the plate in U form.
The results were good.
The results were good. The polyester tank sits on rubber grommets at the back and
front, and is mounted on the frame and sub frame with 4 rubber o rings. So it can
by mounted/demounted in a few seconds. Under the tank the bobine (spool) support
has been welded at the frame and also the support of the on/out switch. At the cost
of much work by Rick the polyester race saddle and the tank connected beautifully
to the sub frame. A thick black piece of Neoprene was formed into a saddle. The
back fork of the Nassetti is built good and stiff, and therefore impossible to see
how the fork was mounted to the frame, hinged. This point has been looked at very
well, before being worked on. The original hinge pin, which had the possibility to
prevent the side space, has not been used again. After any turn work, we put some
strong bronze tubes in to the frame and could the back fork, by means of a new hinge
pin, better been mounted. All the turning points of the fork can be lubricated
The back fork of the Nassetti is built good and stiff, and therefore impossible to
see how the fork was mounted to the frame, hinged. This point has been looked at
very well, before being worked on. The original hinge pin, which had the possibility
to prevent the side space, has not been used again. After any turn work, we put some
strong bronze tubes in to the frame and could the back fork, by means of a new hinge
pin, better been mounted. All the turning points of the fork can be lubricated by
one grease nipple.he back fork of the Nassetti is small, and there fore it is not
easy to find a suitable back nave. And also the nice aluminium back wheel we wanted
to mount did not fit.
The only thing we could use was the rim and the spokes. To have a well fit nave we
had to make it ourselves. The biggest problem with the Nassetti is to get a good
chain line while the rim is exactly in the middle of the fork. Even with the street
version, it cost us a lot of trouble. To mount the suitable nave we had to turn a
flange out one piece to make the nave smaller, and to put the chain tooth wheel on
the chain line. To ensure that the flange will be straight and centered, it has to
stay in the lathe, for an error of 0,1 mm, could make a swinging wheel, as well as
in the Y and X cinder . It cost us 2 days.
It is always exciting to see if the product fits. Luckily the flange and chain fits
well. A secondary advantage of this back cinder is that it is mounted with a sting
cinder. And so the chain strain will not be mend by demounting the back wheel.
By putting the Nassetti on the wheels the sitting position and the places of the
foot support, could be fixed. One thing was clear the Nassetti is small and low.
To put the foot support on the right position you need 2 strong 8mm aluminium
plates. Left and right are not similar, even here we have ensure that the both plates
were placed at the same time. The security bolt of the left foot support is also
the flange point of the brake pedal. The adjustable brake cable is also mounted there.
The brake pedal has been made to measure and operates a standard back brake cable
( kreidler). The plates are connected right at the front of the back wheel. This
unit is mounted to the frame with 4 m8 bolts. Because the sitting position was put
to the back, it turned out that the backspring action was not strong enough. So it
had to be adjust. Two double dimmed agons have to do the trick. Just now, at the
test drive it would turn out if they hold. To mount the motor block cost us one our.
The Nassetti frame and motor block used here are both new, but they are from 1955.
The Nassetti racer motor block has to be put into the frame with force. But the
motor has to fit scull free and has to spring in the anti tremble tubes. After an
hour of filing and shaping and
fitting the block slid smoothly into the frame and we could tie the three bolts.
These bolts are not tied strongly for they only have to hold the motor in place.
The female screws are extra security against trembling. So the anti trembling grommets
are used optimally this way.
Picture 1 reflects nicely the state in which the Race Nassetti is. Now we can finish
the parts permanently together. If every part fits after pre-mounting we can send
them for painting and enameling. In this case all the parts are sprayed. Alas , the
exhaust is not yet chromium plated, so you can still see some welded spots. On the
picture you cannot see the leading for the cables , which is not yet mounted. The
handle bar was also not correct and was replaced later on. Here you see no front
mudguard , for I did not know that it was required. Before you can enter the racing
circuit, the motor has to have an inspection. Not only for safety, but also on looks.
This machine is a 1955 model, so I am not allowed to use disc brakes or digital revolution
For safety it is allowed to mount modern springs (antique look) and tires.It is always
forbidden to drive without an approved helmet. But you can drive with a classic look
outfit. I call it the seal outfit. Well, let us see what the painter has done with
the bike. It is strange to build a Nasetti racer after a year of preparation, as
if it is a common matter. I have forgotten to make
pictures of the different mounting phases. In the meantime the inspection demands
came, and now we could apply it to the racer. Not only safety but also the milieu
has been thought of.All the cables have to be soldered, handles and steering wheel
ends have to be rounded off etc. etc. Every bolt/female screw; for example, the
front/back wheel had to be secured separately. Even the hinge points of the back
fork were taken to a second level of security. All the points at the motor block
have to be especially secured when there is a possibility of leaking oil . A small
but important detail are the air valves of the tires: they have to be protected with
(not plastic) with extra rubber rings to prevent that the tire going flat suddenly
from a defective valve. The ventilation of the petrol-tank and carter had to be made
in such a manner that none of the contents could drop on the street. It seems a bit
exaggerated, but nobody likes to have oil or grease on their tires. And in the second
place, milieu stresses the bike in mechanical sports. The tires are critical. Every
owner of a bike, no matter who, wishes that his bike was that well looked after,
after every race. Before every race, the bike has to be inspected, even if you only
have had a short race, for example, 5 km. Who is who given an example.
Picture 2, shows how the Nassetti racer looked at his first test. But that was after
I had dragged the racer down two stories. Now I could try the motor block (1955),
which was as new and had never been used. The algorithm for a 45 years old Nassetti
is: put 500 cc oil in the motor and fuel in the tank. Open tap, push 3 times on the
choke. In the case of the racer, put the gear in the second position. Develop speed,
release the clutch. The motor runs directly. And just drive away. I was surprised
it worked at once. On a beautiful day in spring 1997 I tested the racer on a closed
highway in the neighbourhood of Ermelo. 500 meters to and fro, without any curves.
Nice but not satisfying. Besides, the motor was that new, so that driving it with
full power would be stupid. But racing season approaches. There still were several
obstacles to take, but it cost money. An empty purse is not a good base. I needed
a new outfit , helmet, sponsor , etc. I still have my racing boots.