INTRODUCTION 1.1. Foreword We would like to thank you for purchasing your new Aixro XR50 4-stroke rotary karting en- gine. By doing so, you have helped set new standards for driving performance and environ- mental responsibility. ! But before getting started, it is imperative that you read and understand instructions...
1.2. General Safety Instructions ! The XR50 is one of the fastest karting engines available, and it might take some get- ting used to. Please remember to be safe, brake early, and never drive faster than you can control. ! The XR50 is made exclusively for kart racing. Using the engine in other applications is strictly prohibited without our express written consent.
1% of comparable 2-stroke engines and reach best 4-stroke level in the driving cycle. The engine can be operated with a catalytic converter. The XR50 uses a carburettor and fuel lubrication at a ratio of 50:1. Contrary to a two-stroke engine the oil burns without residues.
ASSEMBLY 4.1. Cooling System The XR50 uses a standard karting radiator and a conventional water pump, which is driven by the rear axle, as well as standard karting water hoses. Place the engine on your kart without bolting it down. This makes it easier to access the water connections.
If you should not have an exhaust gasket, you can just bolt the exhaust header directly to the engine. 4.6. Electrics From 2011 The Aixro XR50 is equipped with a PVL ignition, which includes some additional features for onboard starting. Even when equipped with the onboard starter the engine will start easily with an external starter.
Though the XR50 is a 4-stroke engine, it ignites with every engine revolution like a 2- stroke engine. Therefore your system should be set to “2-stroke”.
! Double-check the assembly and the steps for first launch. 5.5. Start Preparation The XR50 can be started with an external starter or an onboard-starter (if so equipped). Al- ways make sure the battery is fully charged. ! Normally the engine will start immediately. If it should not start right away, you should look for errors instead of trying again.
10000rpm within one (1) second. ! From 2008 all Aixro XR50 engines are equipped with a rev limiter. Still, the rev limit can be exceeded in case of a malfunction, especially if you run the engine at too high speed without load.
6.3. Driving With the XR50 you will be quicker than most other karts on the track. Have fun, but be con- siderate of other drivers and never drive faster than your skills and experience allow. Try to develop a smooth driving style. Brake early, build momentum with high apex speeds, and accelerate early from corners.
A normal overhaul usually includes a check to make sure the engine components are still in good condition. Sometimes it may become necessary to replace bearings. Otherwise no fur- ther service is necessary, so the XR50 requires remarkably less maintenance than other karting engines.
! If the friction discs are excessively worn, the weights of the clutch can spread making contact with the clutch cover. This will damage the clutch and the clutch cover. 7.3. Air Filter Red Filter for Aixro and Dell’Orto Carburettors Only use the original air filter provided and keep it clean. Cleaning is especially recom- mended after “off-road excursions“...
TROUBLESHOOTING Problems can also occur with the XR50. Some can be resolved at the track with basic knowledge, while other problems should only be handled by an expert. Generally you should only do work you are comfortable with. If you feel overwhelmed or unsure, your dealer will be available to help you or to contact aixro for support.
9.3. Carburettor Adjustment It is not a problem to run the Aixro XR50 with a rich jetting, and standard jetting of the carbu- rettor works well under most conditions. If you should want to try jetting modifications, you should be very careful.
11. WARRANTY / LIABILITY 11.1. Liability The Aixro XR50 motor may only be operated at the user’s own and unlimited risk. This in- cludes personal and material damage, injury, loss of wages, etc. 11.2. Warranty Grant Only aixro GmbH is authorized to covenant warranty grants. Aixro guarantees the faultless function of the engine if it is used and maintained properly as described in this manual.
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