RENNTECH AIXRO XR50, Руководство оператора

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6
ASSEMBLY PROCEDURES
(continued)
3.3
CHAIN TENSIONING
Generally, the engine should be mounted as close to the rear axle as possible to achieve the
shortest chain length (in this case, approx. 33”). Be sure to choose a suitable rear sprocket for
your racetrack, such that engine rpm does not exceed 10500 at your kart’s top speed on the
longest straights.
!TIP: if the gearing of a 100cc racing kart for your track is 10/82, subtract 37 from the large
chain ring - this will give some indication of the correct gearing (e.g., 82 – 37 = 45). Note that
this is merely a guide, and it is important to closely monitor engine RPM (while driving) to adjust
sprocket/gearing accordingly.
At the tightest spot on the chain, it should be possible to move chain (slack) approx. 10mm.
Once the chain is tensioned correctly, assemble the clutch cover.
!TIP: over-tightening the chain will damage the clutch and bearings.
!TIP: do not use a chain lock or master link - the chain must be riveted. RENNtech recommends
Regina O-ring chain (available from RENNtech for 89.00USD). Clean and lube chains regularly,
using O-ring safe cleaners (such as WD40). Stronger cleaners (brake cleaner, etc.) will dry out
and damage the O-rings.
3.4
FUELS AND FUEL LINES
The Aixro XR50 can be run using 91 octane “premium” unleaded without problems. RENNtech
recommends a 93 octane “premium” (determined with the formula: (MOZ+ROZ) / 2, where MOZ
is “motor octane”, and ROZ is “research octane”). Petrol-resistant rubber fuel lines should be
used at all times, and a fuel filter should be mounted between the fuel tank and the inlet to the
XR50’s fuel pump. The fuel line for connecting the fuel pump to the carburetor’s float chamber
is pre-assembled.
!TIP: the engine MUST BE RUN WITH A FUEL/OIL MIX, approx. mix ratio of 40:1.
RENN TECH / AIXRO XR50 ENGINE OPERATOR MANUAL