Kymco Super 9 70cc kit
Dave
required changing the roller weights. I've had more of a dropoff of
power around 32-35mph going to 40mph the more I've ridden. When I go
up moderate hills the speed drops to 25-30mph. Will I gain any mid-
range speed benefits by installing the 70cc kit w/ 19mm carb, kevlar
belt, etc? I need to be able to go around 40-45mph when going up
these hills. The top speed I get right now is acceptable.
What roller weights are recommended when installing this kit? Is
there any other modifications I need to do besides the ones mentioned
above.
Dave
greggscooter
"Dave" <david...@yahoo.com> wrote in message
news:2c684bf5.03031...@posting.google.com...
If you are over 180 lbs. you will benefit by going to a heavier torque
spring. This will keep the rear pulley closed tight so as to keep rpms up in
the power band peak under acceleration and hill climbing conditions.
A mallosi vario comes with an upgraded spring, but heavier riders
benefit by going to the red 'racing spring'.
Have fun,
Gregg
George Skelentchev
By installing a 19mm carb and a 70cc kit you will substantially increase
the power of the engine. I'm sure that you will be able to go faster that
the 40-45mph you require.
However, I'm not convinced that this is the right way to tackle the
question. A 70cc kit would require changing, the air filter system, the
clutch and the crankshaft. To be honest, almost everything!
You can achieve your goal will a 50cc cylinder and a 17.5mm carb as well
since it's all about right settings. I have come to believe that the
scotter model is irrelevant to a large extent. It could be anything and
it could still run well. The speed and the power delivered at the back
wheel of the scooter is an equation with lots of variables. The key words
here are correct power generation and delivery! The weights, the exhaust
and the clutch spring are only a part or the whole. I wouldn't be
surprised if by installing a supposedly better exhaust, you actually lose
power at a certain regime. I'm not sure if a dealer has time and
willingness to run all the tests necessary to get your scooter in a good
shape. But you can do this by yourself if you have money, time, patience
and understanding. As your engine can now potentially deliver more power
start with installing a tighter clutch spring to avoid any belt slippage
at the rear polley. The spring shouldn't be too tight as this results in
power loss and increased belt usage! After this, change the roller
weights untill you reach a satisfactory result -this is very subjective.
You may need to install a new vario, probably with a more progressive
profile- this is important! You have to also make sure that the clutch
engages at a correct moment, ie the power is sufficiently high to provide
good acceleration. (Racing clutches engage at higher revs.) Since the new
exhaust alters (greatly!) the combustion characteristics, you have to
make sure that the combustion process is OK with your carb settings. You
have to look at the colour of the spark and tweak the jet needle, needle
jet, main jet, idle air setting at all throttle positions. Not to mention
the CDI. You may achieve a high power at high revs like the racing
scooters but this results in an increased fuel consumption and a lot of
noise. (Personnaly, I don't think this is the way to go but this is only
my opinion.) Actually the purpouse of the vario is to achieve just this.
It depends very much on the power characteristics of your exhaust. I
personally prefer not so peaky ones.
The roller weights, which are recommended with the exhaust are only a
recommendation! The are not a result of any particular testing regarding
your scooter.
As for the belt, I don't think a kevlar belt has much influence -it's
only meant for more demanding racing conditions. Make sure that your belt
is not used and change it when it gets used, that's all.
I know that making adjustments on your scooter is a tedious process but
it's the only way you can efficiently use the power delivered by your new
exhaust. I cannot help you very much because it's a matter of a lot of
systematic trials and testing. (Not unlike F1 car testing.) Rememeber,
it's not so easy to achieve top speed and high acceleration since these
two are almost in all cases mutually exclusive. And by the way, the more
you make adjustments the more it likely that something will break.
Scooters are relatively weak vehicles.
I have a 50cc cylinder and a 17.5mm carb. The top speed of my scooter is
60mph on a flat road. There is no hill around my place that the scooter
cannot climb at 40mph at 1/4 to 1/2 throttle. The accelaration up to
40mph takes about 4 seconds. This is fairly enough for me as scooters are
not meant for a very high speed.
George
Dave
someone at moped hospital to get an idea of some changes that could be
made to enhance the mid-range. After getting ideas from them I talked
to the shop where I bought the scooter. Luckily the owner's son is a
mechanic and he owns the kymco super 9 and rides it alot (along with
racing it). He's gone through the experience of finding out what
enhancements give the scooter the different levels of performance. As
you suggested George he said a tighter spring would help. We're going
to start with this and go from there. He's enhanced his scooter with
the 70cc kit, variator, clutch and 19mm carb. It's amazing the
performance he's gotten with his scooter. He's willing to work with me
on achieving the performance I want (more mid-range). I live in a
hilly area of texas that taxes a non-enhanced scooter. I wish I had
more time to do this stuff myself but with a fulltime job, a side
business and a baby on the way the time just isn't there.
Thanks again for the explanations. I'll keep this group apprised of my
progress.
David
George Skelentchev <george.sk...@nokia.com> wrote in message news:<3E7AE70C...@nokia.com>...