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VORTEX FACTORY: Via E. Fermi, 5 – 27040 Campospinoso (PV)– ITALY – Tel. +39 0385 765200
5.13. Piston
Oils produce carbon deposits or residues that
make necessary the spark plug to be checked
and cleaned, at least every race.
Be aware, cylinder head volume may be
changed after the race, carbon deposits may
cause variations on the cylinder head volume.
Every 30 hours piston must be replaced.
Via dei Soprini, 16 – 25080 PREVALLE (Brescia) ITALY-Tel. +39 030 6804601 – Fax +39 030 6804698
In order to perform this job, we highly
recommend taking the engine off the chassis.
However, you may do the job even with the
engine mounted.
1.Take away the muffler from the engine by
removing the 2 springs in the cradle and the 2
springs in the exhaust manifold.
2.Remove the carburettor from the engine by
unscrewing the specific clamp.
3.Unscrew the 4 nuts on top of head (3).
3.Remove the head by pulling it up carefully.
4.Remove the cylinder with one hand by pulling
it up. To avoid contact with the crankcase, use
the other hand to hold the connecting rod.
Whenever you disassemble the cylinder, we
recommend replacing the cylinder gasket.
5.Remove the 2 piston pin circlips (65) by
squeezing the ends together with the needle-
nose
6.Hook the connecting rod each side with two
fingers.
7.Push the piston pin (66) off the piston by
using a proper tool.
8.In order to avoid damages pull the piston up
with one hand while holding the connecting rod
with the other.
9.Take the roller bearing (70) off the
connecting rod.
ASSEMBLING
Check the tolerance between piston and
cylinder. Assemble ONLY a new piston with
the right tolerance. Wrong tolerance may
cause serious damage.
10.Grease and place a new roller bearing (70),
if needed, on the connecting rod.
11.Insert a new piston in the connecting rod.
The arrow marked on top of it, must face the
exhaust port.
12.Insert the piston pin into the piston.
13.Insert piston pin circlips on each side of the
piston. Be aware, wrong assembly of piston
OTK KART GROUP srl
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