I'll start off with my standard disclaimer by saying that I did not do all this work by myself. I have perused some websites, and gathered up this information to put in one place. As with anything, your mileage may vary, but from my research, this is what I've gathered:
This may also be known as a compression or push start. On an EFI bike, you MIGHT be able to bump start succesfully, but not guaranteed. Why the doubt? Well, you still need a battery that has some charge to it.
When the ignition key is turned on, the ECU, and it's various sensors get energized, the headlight and tail light comes on, and the fuel pump primes the fuel system. To do this it takes an 8.5 amp load from the battery. Once the fuel pump has stopped, and the fuel system is at prime, the electrical load is reduced to 5.64 amps. So, your battery can't be completely dead or you'll be calling for help.
Assuming that the battery has enough strength to actually get to priming the fuel system, you can try and bump start the bike. It's pretty much a no-win if the battery is too weak to prime the fuel system. Keep in mind that the headlight and tail light is contributing to a constant current draw. Normally, when the starter button is used, the headlight will cut-out while the engine is cranking. This isn't the case here.
The art of bump-starting a bike is pretty simple.
1. Make sure that you have fuel
2. Ensure that the Kill Switch is in the RUN position
3. Put the transmission in a taller gear like third
4. Pull the fast idle control (choke knob) to the first position unless the motor is hot
5. Turn on the ignition, and hold in the clutch
6. Go for it! Either have some buddies pushing you or go down a hill
7. When you get up to at least 15 km/h (10 mph), quickly release the clutch. Beware of the back wheel locking up, and if the engine doesn't turn over or start, be ready to pull in the clutch to maintain control.
8. If its your lucky day, and the engine fires, apply throttle and pull in the clutch
9. The engine may want to stall as the stator/alternator is pulling a big load trying to charge the battery, so keep the throttle going.
10. It can take approximately 20 minutes to get the battery charged to the point that the bike can idle on its own. Please note that the battery is NOT fully charged at this point and shutting down the engine may repeat a no-start situation.
11. Go for a LONG ride (with backup friends, and/or cell phone) or put the bike on a proper charger.
For those that think that you could generate enough electrical power by simply bump starting the bike to cause the fuel pump to work would be extremely dangerous and the ECU, relays and fuel pump need a constant source of power.
The battery on these EFI bikes needs to have a voltage of more than 12.6 volts to start. Some bikes have required nearly 13.0 volts. Take care of your battery.
You can go around the low battery cut out by shorting the two terminals on the starter solenoid that lives behind the RH side cover. This would work if your battery may be strong enough to prime the fuel system, but be below 12.6 volts. NOTE:
that by doing doing, all safety controls are also bypassed . So. kickstand switch, clutch switch, neutral switch, etc are bypassed, so
make sure the bike is in neutral first! Here's a picture of the starter solenoid. Bridging the two terminals with the red arrows will enable the bike to start.
By hyates
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