© Aixro GmbH / Woelfle Engineering GmbH
6/23
! Never use a chain lock. The chain must be riveted.
! Do not use a gear ratio shorter than 11:53. A shorter gear ratio will not make you
faster, but it will still increase the load on the engine and the tyre wear.
If you know the transmission ratio of a Rotax Max 2-stroke engine with a 12T sprocket, you
can use it as a guideline. Divide the number of teeth of the rear sprocket by 1.75, and you
have a first idea of the sprocket you need in combination with the standard 11T sprocket of
the XR50. e.g. RMax: 12/79
79
:1,75 ≈ 45
XR50: 11/45
If the chain is assembled, the chain alignment can be controlled by checking the position of
the chain on the sprocket. In every position of the sprocket the chain must have slight space
to the sprocket on both sides. This also ensures that the sprocket is not warped.
4.3. Carburettor / Fuel Supply
The fuel tank should have two connectors. One connector needs to have a line on the back-
side, which leads to the bottom of the tank (a standard design for karting fuel tanks), while
the other one must not have a tube on the backside. If the fuel tank should have a third con-
nection, it should be blocked off or connected to a separate line, which has an open end se-
cured above the level of the overflow tank.
The overflow tank itself must be open to allow decompression and attached above the fuel
tank, for example on one of the Nassau Panel brackets.
1.
Slide the rubber carburettor connector over the inlet manifold, so it snaps into the grove
of the manifold, and attach it with a hose clamp.
2.
Push the carburettor into the connector, so it snaps as well, and attach it with another
hose clamp.
3.
Connect the fuel tank connector, which has the line on the backside, with the front
brass connector of the fuel pump.
4.
Cut this line and install an in-line fuel filter (making sure it is clear from moving parts
and the ground).
5.
Connect the fuel pump with the carburettor.
6.
Connect the fuel tank with the overflow tank.
7.
Connect the line of the (black, round) vacuum actuator with the nozzle at the inlet of the
carburettor.
Since the beginning of 2010 we have started using a new rectangular fuel pump instead of
the round Mikuni fuel pump. The advantage of this pump is that it has an internal pressure
limiter. Therefore it is no longer necessary to install a return to the fuel tank, and the needle
valve of the carburettor has better performance.
Note that the carburettors have now been adjusted to operate with the new fuel pump, so
they may not necessarily work properly with the Mikuni pump.
! The fuel lines must be made from fuel-resistant rubber.
! Attach the fuel lines to your kart using tie wraps or tape, making sure they are not
touching the exhaust, the engine, moving parts or the ground. Check that tie wraps
cannot move in case the kart should hit the ground.
fuel
tank
fuel pump
overflow
tank
Bing
carburettor
open
overflow
pipes
in-line
fuel filter
p
ip
e
f
o
r
3
rd
c
o
n
n
e
c
to
r
ambient air
vacuum
actuator
carburettor
Содержание XR50
Страница 1: ...OPERATION MANUAL...
