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Old 01-26-2008, 07:01 PM   #1
AhmadHasib
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Question about Roll Starting your Fuel Injected Bikes

I've read some people talk about push starting their bike when their bike's battery runs out at random occasions such as, filling gas at a gas station and such. But I'm a little confused with this idea.

Fuel Injected engines require an ECU of some sort so it can be programed to know how much fuel to spray inside the motor. This ECU would require some sort of power from a battery. If the battery is dead, how is the ECU (or what ever computer used) getting its "juice" to read the information about fuel going to fuel injectors once the bike gets running?

I understand how it could work on a carburettor type engine (no ECU or such required), but not really following with a Fuel Injected motor.
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Old 01-26-2008, 07:07 PM   #2
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your battery will never go 100% dead and is very little what you need to for the FI.
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Old 01-26-2008, 07:38 PM   #3
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As he said. Your ECU needs at least 10 volts to operate (i believe it's 10V). Also there must be enough juice left in the battery to run the fuel pump. Just so you know also, the higher gear you try to push start the bike in - th easier it will be to push. the trade off is that the engine will turn over slower.
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Old 01-26-2008, 07:41 PM   #4
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As long as there's enough power to cycle the fuel pump and pressurize the rail it'll probably start.
If not, you can jump it off from a car, just make sure the car is NOT running.
A cars alterator puts out too much amperage while it's running and can fry a bikes charging system.
Hope this answered your question.
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Old 01-26-2008, 07:50 PM   #5
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thanks guys
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Old 01-26-2008, 08:29 PM   #6
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Patrick my old CBR would not charge a battery if the charge had gotten below 10V I could push start it but it would not charge. Have you seen this?? I noticed this when I let it get low and when I pushed it I got in near home but it quit running and the batt was down to 8.1V even with the bike motor spinning. checking thing out it would jump up to 14.7 as soon as the battery was charged above 10V.
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Old 01-27-2008, 01:46 AM   #7
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I've confirmed that a hayabusa with a dead battery will not run, even if rolled down a parking garage for 3 stories, and another 2 stories even with the clutch pull switch bridged so the bike thinks the clutch is pulled in. Jump starts right up tho.
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Old 01-28-2008, 05:07 PM   #8
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Quote:
Originally Posted by ysr612 View Post
Patrick my old CBR would not charge a battery if the charge had gotten below 10V I could push start it but it would not charge. Have you seen this?? I noticed this when I let it get low and when I pushed it I got in near home but it quit running and the batt was down to 8.1V even with the bike motor spinning. checking thing out it would jump up to 14.7 as soon as the battery was charged above 10V.
When I stayed in Austin a few of my friends and I rode to SA. One of them had an old CBR also and the battery kept going dead every time we stopped. What we decided to do is for him and I to switch battery so my Gixxer could charge his while riding. Needless to say that mine worked a couple of times for him before mine went dead. We ended up parking the bikes an just walke around then when we decided to leave we switched back to our original battery. Also I was told if you need to push stat a bike it is better to use 2nd gear rather than first due to non experienced people flipping the bike.
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Old 01-28-2008, 06:31 PM   #9
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Quote:
Originally Posted by ysr612 View Post
Patrick my old CBR would not charge a battery if the charge had gotten below 10V I could push start it but it would not charge. Have you seen this?? I noticed this when I let it get low and when I pushed it I got in near home but it quit running and the batt was down to 8.1V even with the bike motor spinning. checking thing out it would jump up to 14.7 as soon as the battery was charged above 10V.
There probably wasn't enough voltage to "switch" your regulator rectifier.
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Old 01-28-2008, 06:37 PM   #10
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Often if you try to push start a bike in 1st gear, when you dump the clutch the rear tire will lock.
2nd gear will allow the tire to drive the engine easier and as mentioned by dirtybaydj it will reduce the chances of flipping the bike when the engine starts.
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