 |
We sourced a 54mm performance Piston
which has better quality and
ring
configuration than the standard item.
It is also 2mm lager in
diameter lifting
the capacity to 107cc. The Piston is also
available
in OS so rebores are possible
unlike the 57mm Malossi Cylinder which
needs
to be junked. |
 |
You can see the differences
between our modified Cylinder on
the
left and the standard. Just a
lot of know how that's all!
Basically,
standard Yam runs 118
Trans and 168 Exhaust. Play with pipes,
carbs
and transmissions all day long.
It'll never go... |
 |
The Yams exhaust port is one
of it's biggest
restrictions.
Malossi is the same too! Why?)
It needs to be tapered
and matched
to the exhaust Header, which brings
me to another point.
Noticed how the
Leo Vinci HMZX uses a 50cc size Header?
(32mm and
around 50mm shorter does the trick!) |
 |
This is what the kit looks like
like as a package. I'm not giving
away
too much but for those of who are smart
enough, get to it! The
standard Cylinder
Head is a disaster. It is of the wave or
ripple
type and as such does not permit a
tight squish to be set. Easy, we
weld it up
and machine it correctly, keeping around
the same CC and
finishing with a full squish
type layout. This way cooling and
detonation
are supressed at higher power levels. Oh, and
that
Aluminium welds like cheese too! |
 |
Magic! Hey that Cylinder deck looks
machined too! What the? |
 |
We also developed a new Carb setup
as opposed to the off the shelf
22mm
Malossi item which is jetted to run with
the Yam Air box. This
is a 21mm PHVB with
an oval bore which improves throttle
response.
It's sorted to run with a Pod filter but
still requires
the large diameter inlet
manifold as shown. Sounds awesome and is razor
sharp! |
 |
Because this engine will run at
around 9-9500RPM the timing
needs
to be retarded to suit. As there
are currently no aftermarket
CDI's
available, we slot the ignition trigger
and are able to retard
the timing by
near 3 degrees. This ensure high RPM stability. |
 |
Back on the road and run in the
Aerox now displays a
completely
different character, with the front
wheel now able be
lofted quite easily
under full acceleration. Overall its a
massive
upgrade to this normally pedestrian
but colorful scooter
|
