When dealing with the Rotax FR125, there are three basic areas that need to be understood and paid special attention to. Those that take the extra time to perform the duties listed in these areas will be rewarded with a lot less downtime and fewer hours of frustration at the track. Click here for tuning tips.
Rotax fuel pump
The fuel pump is essential in the proper supply of fuel to the carburetor. The Mikuni pump has (2) gaskets and a plastic membrane inside that should be cleaned regularly and inspected for irregularities. When in doubt about performance of the fuel pump, it is always a good decision to rebuild the pump using new gaskets and membrane. When connecting the fuel pump to the pulse tube on the motor, be sure to use the shortest piece of hose possible. Also be sure to use the stiffest, smallest diameter hose available as this will aid in creating the best vacuum/pulse line possible.
Rotax carburetor
Without a doubt the biggest source of headache for most Rotax owners is the carburetor. What to know more about looking after and tuning the rotax carb then click here.
Rotax electrical
The Rotax FR125 operates using at 'total loss' ignition system. The charge and condition of the battery is therefore very important for the operation of the engine. Click here for more information.
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