Page 10 - C2W1906

performance and cause the exhaust being the inlet is relatively rough. When the mix-
not smooth. If the exhaust pipe is replaced ture enters the inlet, there will be a certain
with a straight exhaust pipe, it can theoreti- amount of gas attached to the inlet, and
cally increase the power by 15% . when the inlet is smooth, the fuel efficiency
can be improved. So as to improve per-
2. Change carburettor formance and reduce fuel consumption. It
There are several ways to change carbure- takes a certain amount of patience to grind
tors in general: the inlet!
(1) change the carburetors with larger calib-
er. 5. Change ignition heating up curve
(2)Optimizing the main jet of the ex- In general, there are ready-made unlimited
isting carburetor (properly enlarged) and the speed igniters on the market that can be
main oil needle of the carburettor (re-grind- used directly. It can increase the speed of
ing the fuel supply curve), finally adjusting 5 to 15 yards. If you’d like to run faster, you
the mixing ratio and enlarge air filter, so that can make a new adjustment on the basis of
the engine can basically do so. The engine changing the compression ratio. Generally,
can get at least 15 to 20 percent more pow- after changing the compression ratio, the ig-
er, but it is not enough with these , and the nition heating up curve can not adapt to the
transmission ratio has to be changed. new compression ratio, and it will be easy
to start the phenomenon of rebound and oil
3. Increase compression ratio release, so the effect of high compression
There are many ways to increase the ratio can be improved by improving the igni-
compression ratio: cylinder head welding, tion heating up curve.
changing tip piston, changing ultra-thin cyl-
inder pad. Among them, changing ultra-thin Things should be paid attention when refit-
cylinder pad is the safest way, but the ef- ting.
fect is also the worst. It is more suitable for 1.More than 24mm diameter of the
fancier who do not have modification expe- carburetor need to change the intake man-
rience to try. ifold, and 20mm or 22mm diameter do not
need to replace the intake manifold.
4. Grinding inlet 2.Refitting carburettor is not the
As a result of the work of some small-dis- bigger the better. A large carburetor, on the
placement motorcycle, the inner wall of other hand, can cause excessive intake,

10 JUNE 2019 Motorcycle Reviews china 2 wheels 11