Tuning
| Stock Applications |
Tires: |
I would recommend getting new tires
for your scooter. The reasons are:
Higher center of gravity, which means better handling
and more lean ability in cornering
The stock tires are so short that your can dent your
rim on a driveway
There are better tires than the cheap rubber that
comes from the factory
It is an easy upgrade and most bigger sizes will fit
perfectly
Your bike will be faster (but the speedo will show
slower - bigger tires fool the speedo)
I used Michelin
S1 tires on my bike. They have a better tread
pattern (more like a bullet bike style) and are
made of a better rubber. Michelin
has a reputation for quality.
Concerns:
None.
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Oil: |
I would always recommend using fully
syntheitic oil. The reasons are:
It will increase the life of your motor because
it has better lubrication properties
You can get it in fragrances (some smell like cologne
and strawberries)
It burns cleaner, which means less smoke
We don't have to rely on the middle east for it
Concerns:
It costs a little more than fossil oil, but well
worth the money, especially if you love your scoot!
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Derestriction: |
Some people have raised concerns
over the jetting after they have derestricted
the stock pipe. It was not an issue for me here
in Utah, but I am at 4500 feet altitude. The best
thing that you can do is to derestrict the pipe,
then use a new spark plug and do a plug read.
The trick is to measure every level of operation
of the carb. This is covered in the carb
howto,
but here is a brief run down. First run the bike
at one quarter throttle for a block, without letting
off the gas, hit the kill switch and stop, pull
the plug and read it. That will tell you about the
primary or pilot jet. Next do half throttle, then
full throttle, that will tell you the needle height
and secondary jets, respectively. Jets for stock
carbs are available at Yamaha,Arreche
carbs use the same jets as Mikuni carbs, and
are easy to find at your local motocycle shop. |
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| Perfomance
Applications |
Stage
One: |
The first stage of
performace must include the following: (~47-52mph
with improved acceleration)
Performance
pipe, the Tecnigas Next R
After market variator using 16x13mm roller weights
16x13mm roller weights between 3 and 7 grams
(Zuma typically uses lighter [<4 gram] rollers)
Removed snorkel in the stock airbox (optional, would
require a plug read)
When you change the pipe, the stock variator,
which uses smaller rollers is not designed to
take the added power and will not work correctly
(will spin out fast, keeping RPM's too low and
out of the power band).
Get
your Stage One here!
Concerns:
You will have to tune the weights to your riding situation.
If you are constantly riding on hills, you will want
a lighter weight. If you are on flat most of the time
you will want a heavier weight. If you weigh between
170-200 lbs, you will need to go a little lighter.
It will be louder than stock
I don't rejet here in Utah for this, but you will
have to do a plug read (see previous section titled
derestriction) to determine the needs in your geographical
area. |
Stage
Two: |
The second stage of performace must include the following:
(~55mph with unbelieveable acceleration)
Included
all the parts from stage one
70cc
cylinder (Airsal full aluminum recommended)
19mm
Carb (I like the Arreche for two reasons:
Jets are easy to find since they are the same
as Mikuni, and it is easy to change the main jet
via a plug at the bottom of the bowl)
Unifilter
is designed for smaller two-stroke motors, but
you can also find small K&N filters they use
on motorcylces that will fit with slight modification.
You must use the bigger carb, or the bike will
run too lean and will seize. The airbox is for
better flow and improves performance, you could
use the stock airbox, but it is not recommended.
Get
your Stage Two kit here!
Concerns:
You have to run fully synthetic oil with this
setup
Louder than just the pipe change (kinda like
a mild chainsaw)
You will have to use a manual choke if you plan
on riding your scooter in sub freezing temps
You may also have to bypass the automatic fuel shutoff
valve
Kevlar
belt recommended |
Stage Three: |
The third stage of performace includes the following:
(~60mph with rocket acceleration)
Included all
the parts from stage two
Polini Speed Clutch
Malossi
Kevlar drive belt
You can use any of these items with out the other. The
reeds will increase your top speed while the clutch and
belt will give you a faster "hook-up" off the
line. The clutches are fully adjustable which is nice
for tuning, but I usually don't have to change them.
Concerns:
I can't think of any drawbacks to this stage |
| Stage RACE: |
The RACE stage of performace includes the following:
(Depends on setup and tuning)
Included all the parts from stage three
Fully balanced race crank
Full race cylinder with 12mm diameter rod
21mm carb
Tecnigas RS or comparable alternative
Race ignition good for 25,000 rpm's
This scooter will probably break the earth's gravity
Concerns:
The motor is only good for about 20 hours
You have to replace the crank (about a five hour job)
With the race ignition you can no longer use lights
Great for racing, not so great for general street
shinanigans
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