Artem

Hello, could you tell me what could be the problem with starting a cold engine? I have to put the bike on a stand and kick it as hard as I can about 20 times. After starting, the bike starts right after turning off the engine, but if it sits for 2 minutes, it is very difficult to start again, sometimes even impossible. The bike has a lot of mileage (about 1000 engine hours). After purchasing it from the previous owner, I replaced the fuel filter, fuel pump, injector, hose clamps in the gas tank, ignition coil and condenser in an attempt to find the problem. After that, everything got better, but the problem remains. Direct fuel injection into the intake manifold helps; in this case, it starts every time. I read all the threads on the forum and came to the conclusion that the problem could be in the crankshaft seals or sensors. I have seen people installing small batteries in the filter block, but I'm not sure which wires to connect them to? To the capacitor or to the battery connector, which should be under the seat? I think this option should help, I'd be grateful for any help.