The poor performance of the engine can be due to faulty settings. So to start off we need to check from the fuel tank. Check if the fuel contains impurities and specially water. If so this can come up with the pumping when the tank gets empty and produce misfiring, splutter and jerks. So a check on the fuel filter will confirm this as it will be seen, if so remove and clean tank and change the filter. We then come to the carburetor as the fuel mixing
Then we must check with the electrics. The spark intensity is most important .Remove all plugs to check gap and condition of the plug. The black plug indication will confirm that the performance is bad whereas a fully fired plug without deposits must be the ideal view. Check the HT coil and the HT wires, if the intensity is bad this must be swapped and checked to confirm. DO NOT CHANGE any part without a confirmation by trying with a replacement from another vehicle or friend. Finally the LT trigger to the coils must be checked be it from the platinum points or an electronic ignition unit. The voltage of the trigger must be high to give the best HT output.
Now use a strobe to check the Timing on the engine. Adjust if needed to see the TOP DEAD CENTER-TDC- mark. If there is valve noise make sure that the tappets are set properly so that the valves seat firmly for the best compression. Also check compression of engine if there is imbalance on the engine or reduced power.
FI stands for Fuel Injection. The fuel system sensors have detected a problem. It could be anything > a dirty air filter restricting airflow, a plugged injector, an error in fuel mapping, any number of things. Serious problems can trigger the computer to prevent the engine from starting until the problem is fixed. You will need to take the bike to a dealer to have them plug in a code reader. The code reader will tell you exactly what problem has been detected. There is also a chance a sensor has gone bad and is giving a false signal. Keep that in mind. Now determine if you want to do the fix or have the dealer do it. Please rate my answer.
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