Rotax: better and better

Besides the tests on the dyno, a track test with independent test drivers was organised in the States in September to compare the actual engine configuration with the 2017 set up. The main aim of this test is to have a feedback from karters on the technical innovations carried out by BRP-Rotax. These optimized solutions will be used in Sarno for the Rotax MAX Challenge Grand Finals 2016, a perfect event to try the new set up used for the Rotax 125 MAX evo engine series.
 
The key features under the spotlight are: the new engine control unit (ECU), new battery housing with a multi-function switch, the new cable harness, spark plug and cylinder. Now the ECU is located on the left hand side of the battery housing, and thanks to its new position (used for the Rotax 125 Junior MAX, the Rotax 125 MAX and also for Micro and Mini MAX engines) it’s less sensitive on the main jet above 13,000 rpm with slightly altered ignition timing. “Even with a richer main jet, the engine does well above 13,000 rpm. The new ECU is much more forgiving in the carburetor set up”, said Darrell Smith, Rotax kart test driver.
 
A multi-function switch is attached to the optimized battery housing that makes it easier to handle for the customer.
 
The new cable harness with plug in connection for the multi-function switch is another feature: it incorporates the ground connection for the overall electrical system. The connection for the battery charger is aligned with the cable harness.

The support plate system is more compact with electrical connections for the ignition coil and magnet valve only, which should be easier to use.

The cylinder for the Rotax 125 Junior MAX engine is now made with an improved manufacturing technology (single piece sand core, digital print), which provides constant cylinder performance to guarantee equal performance for all drivers. Cylinders with advanced manufacturing technology are also used for Rotax 125 Micro and Mini MAX evo engines.

All the components have already been legalized in September 2016. It is up to the respective distributor and his federation to decide the date to declare these components legal for their national RMC.

“We are convinced that with all the optimized technical features, the Rotax MAX engine series with its ease of use, equal opportunities, durability and the lowest maintenance in the field will endorse our customers to race a kart with the most advanced technology in the market”, said Peter Oelsinger, Vice President Rotax Propulsion Systems and Finance at BRP-Rotax.