Below is so general info on
tuning 2T engines that I picked up when browsing the web. Changing
the ignition system is very expensive. If you do happen do own the '99
model you should know that after the exhaust sytem, this is where the
NSR is most restricted. Eletronic units which need to be replaced are
the CDI unit and the RC-unit (exhaust level adjuster), when fitting a
more powerful cylinder, replacing these two is very important (as the
new cyclinder would overheat).
Changing
the whole exhaust system and the silencer is the easiest (and most
simple) way of increasing the power output of this bike. However, the
bike may be worth less derestricted. Even if you do own a unrestricted
bike this will always add a few extra bhp's and save weight. Depends of
course on what make it is, if the bike's restricted it should develop
around 22 hp at the rear wheel. Arrow offers most power closely followed
by Gianelli at a 20% lower price. Top speed is said to be around 100mph.
The
cylinder of the NSR125 is restricted and so it ought to replaced with
the Italian full power one which incidently happens to be very cheap.
Malossi and Pollini all make bigger cylinders for the NSR. In order to
prevent overheating the new cylinder, the exhaust level adjuster ought
to be replaced with the unrestricted type Polini produce a 160cc kit
that improves take off power and apparently redlines @ 11900rpm! If this
is combined with a performance exhaust, it is possible to get in excess
of 30bhp.
Engine work requires a
combination of in-depth knowledge of the function of a two-stroke,
internal-combustion engine and the proper tools and training to make
such desired modifications without disturbing the balance and harmony of
the process. It's both a science and an art.
The 2-stroke engine needs intake
ports for getting the fuel/air mixture in, and it needs exhaust ports to
get the spent mixture out. It also needs a way to move the fuel/air
mixture from the crankcase to the combustion chamber. This is performed
through exchange ports, so-called because fuel is exchanged from the
crankcase to the combustion chamber through these ports.
More info. will be added at a
later date.
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