rotax junior max evo

BASELINE MAIN JET (ON VP C9 RACE FUEL): 122

BASELINE MAIN JET ON (93 PUMP FUEL W/ETHANOL): 123

MAIN JET NOTE: IF YOU ARE ON A 2016 OR OLDER CYLINDER, DROP ONE JET SIZE FROM THE ABOVE RECOMMENDATIONS

FUEL / OIL RATIO: 50:1 (2.6 OZ / GALLON) OR (20.3 ML / L)

PIN HEIGHT: PIN 2

FLOAT HEIGHT: NUETRAL (MIDPOINT ON ROTAX FLOAT TOOL)

AIR SCREW: 3 FULL TURNS OUT

IDLE SCREW: 4 FULL TURNS OUT (IDLE AROUND 2,500 RPM WHEN ENGINE IS COLD, SHOULD NOT REALLY IDLE WHEN HOT)

OPTIMAL WATER TEMP: 130 F / 54.5 C

SPARK PLUG: ROTAX GR9DI-8

SPARK PLUG GAP: .9 MM

UPGRADE FROM MINI:

PARTS: Senior header, Senior exhaust, Junior ECU, Senior radiator

ENGINE WORK: none required (same squish as Mini, 1.2mm)