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8.1
FUEL:OIL RATIO
FUEL
!TIP: using higher-octane racing fuels will not significantly improve engine performance
OPERATING TEMP
!TIP: use a mix of water and coolant to protect against corrosion and extreme temperatures
ATTN: DO NOT IDLE ENGINE ON STAND OR IN PADDOCK
JETTING
CHAIN
!TIP: RENNtech recommends Regina 428 O-ring chain
TIRES
MAX RPM
ATTN: TACH MUST BE SET TO 2-STROKE SETTING
CLUTCH PLATES
!TIP: use three (3) clutch weights - bolts and nuts, no washers, recommended
!TIP: pipe is extremely HOT, and may glow red in dim light
!TIP: lube clutch bearings frequently
!TIP: avoid any engine "blueprinting" or modifications to chamber volume - chamber volumes
are already at maximum efficiency, and any mods will result in power loss
ATTN: DO NOT MAKE ADJUSTMENTS TO ENGINE WHILE IT IS ON STAND OR WITHOUT LOAD
ATTN: DO NOT DISABLE VACUUM SOLENOID
ATTN: RUNNING A NON-OEM EXHAUST WILL CHANGE RPM CURVE
ATTN: USE CAUTION WITH NON OEM PARTS; HIGHER RPM WILL SHORTEN ENGINE LIFE
TIPS AND TRICKS
40:1 (approx. 1.6 oz. per gallon or 25 cc per liter)
93 pump octane
150 deg. F
a change of 1 jet (ex.: 166 - 168) usually makes a difference
loose, approx. 10 mm of play
10 - 12 psi
10500 rpm (engine can be over-revved, so watch rpm closely)
should be replaced every 40 - 50 race hours
RENNTECH
/ AIXRO XR50 ENGINE OPERATOR MANUAL
15
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