rotax junior max evo

MAIN JET (ON VP C9 RACE FUEL): 122 (120 IF AIR TEMP > 85 F / 29.5 C)

MAIN JET ON (93 PUMP FUEL W/ETHANOL): 125 (122 IF AIR TEMP >85 F / 29.5C)

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

FUEL / OIL RATIO: 44:1 (2.9 OZ / GALLON) OR (22.7 ML / L)

PIN HEIGHT: PIN 4 (any leaner and your bottom end will really suffer, in cold conditions, go to pin 5)

FLOAT HEIGHT: NUETRAL (MIDPOINT ON ROTAX FLOAT TOOL)

AIR SCREW: 1.75 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: .8 MM

UPGRADE FROM MINI:

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

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

 

 

 

 

                     

 

 

COMPETITION 2 STROKE CARBURETORS AND ENGINES

Major upgrade to the shop with this proper engine stand, courtesy of Kartune Motorsport in the UK. When it comes to #karting the Brits do it right. Thanks to @aventus_power for the tip. . . #iameusa #x30 #enginetuning #UK #kartracing
Racing finally returned to the Northeast, and what a way to start with clean sweeps in X30 Senior and Junior, and great results all around from all of our drivers. The countless hours at the bench and on the dyno during our downtime certainly paid of
dyno day . . #x30 #iameusa #dyno #dynotune #karting #enginebuilding #skusa
A nice batch of @rotaxkarting work got me thinking back to happier times, like P11 at the 2017 Rotax Worlds in Portugal with @aidan.fox.44. Year 2017 > 2020 might be the understatement of the century. I love the Rotax format and have always enjoye
Here you go...you will not be dissapointed. . . . . #X30doneright #iame #karting #enginebuilding #kartdavid @iameusa @superkartsusa @tillotson_racing @kartdavid
A little known and underreported symptom of the corona virus is #waft. With no racing, all there is to do is get prepared. X30s, KAs, Mini Swifts, and even a Rotax Mini Max MY20 conversion...our drivers will be on fresh, fast engines when racing resu
@superkartsusa #supernats23 P25 of 78 entries Decent result after the 101% track condition rule killed our qualifying and we had to start at the back of every heat. @kartdavid @freemuk @tillotson_racing @tillettracingseats @otkkartusa #expritkar
Very proud to be part of Aidan Lourenco’s first race win @ovrp1 in @rotaxkarting #minimax!! @vivekracing had a challenging day but still put in a great drive to score a nice P3. @thomastraylor_ put in a great effort to score a solid P4 at the
Back @ovrp1 this weekend, our X30 drivers set the pace but had no luck in the races. In @rotaxkarting Mini Max Aidan Lourenco drove from last to third after a dropped chain in the prefinal, while @vivekracing continued his domination of the field. Ke
Good day @ovrp1, proud of all of our drivers. #X30 power was on point with pole in both Jr and Sr, race win in Jr, and only last lap contact preventing P1 in Sr. Debut of the new @kartdavid engine decals was a hit! Special thanks to @brandonjarsocrak
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