ASSEMBLY PROCEDURES
(continued)
!TIP: use only self-mixing, high-quality synthetic two-stroke racing oils with high flash-points
(Motul is recommended).
3.5
ELECTRICAL CONNECTIONS
The XR50 can be switched off using a red STOP button (included), which can be mounted on a
kart’s frame or steering wheel (recommended). From there, a wire (with connector) leads to
the engine casing, and is plugged in to the corresponding connector.
!TIP: when mounting the STOP button to a steering wheel, it is important to leave enough slack
to allow the wheel to turn, lock-to-lock, without pulling or binding the wire.
STARTER WIRE: SEE STARTER, 3.8
3.6
EXAUST MANIFOLD
The XR50’s exhaust manifold is fastened with 3 nuts, torqued to 25 Nm. copper-coated, self-
locking nuts are used to secure the header pipe.
ATTN: THERE IS NO EXHAUST GASKET
!TIP: you may use a high temp. silicon “liquid gasket” (sparingly).
3.7
EXHAUST PIPE
The exhaust pipe (or muffler) is fastened to the exhaust manifold with tension springs (2 incl.
with XR50 engine package) in a manner similar to other racing karts.
!TIP: replace the intermediate plastics in the exhaust mount with a strong compression spring
(due to extreme temperatures).
ATTN: EXHAUST PIPE MUST BE ASSEMBLED WITHOUT STRESS LOADS
ATTN: THE EXHAUST RUNS VERY HOT, AND TYPICALLY GLOWS RED - BURN HAZARD
!TIP: use 2 support brackets (due to added weight of exhaust system).
RENNTECH / AIXRO XR50 ENGINE OPERATOR MANUAL
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