Yamaha R1 Forum: YZF-R1 Forums banner

Why is my bike randomly shutting off?

12K views 10 replies 8 participants last post by  DarkHorse  
#1 ·
So I have a 2005 Yamaha R1 . I Recently got it and it originally had an Engine light on with 4 Errors. So I took it to the shop and had them fixed so there is no more engine light. Well yesterday when I was riding, in First Gear, going like 22, the bike just shut off randomly and I had to hold clutch in to restart.. It also happened this morning and I'm wondering what could be causing this.... I was told that something in the fuel pump was going bad (from the shop) which is why it was hard to start sometimes because the pump wasnt pushing out enough pressure but I dont think that has anything to do with it randomly killing while riding. Also when I give it like big throttle (happened once), it killed and other times it is perfectly fine
 
#4 ·
yes i understand the kick stand was not down, there is a safety switch that will shut off the bike if the kick stand is down and they sometimes fail

it would be by the kick stand , get a service manual, this was a simple solution , not trying to be rude but if this was above your head, you should take it to someone
 
#5 ·
Check the resistance on the kickstand switch with it in the up position. Should be less than one Ohm. It could also be your main switch(ignition). Your ignition switch has two circuits on it. One for main power and one goes through your starting circuit cut off relay to your ECU. Unplug your ignition and Ohm out both circuits. Main power is red and brown/blue. ECU is blue/yellow and blue/black. You have to do it with the key turned on and should have less than one ohm on both. Turn the key off and back on and check again. Do this several times as the readings can be random when they start to go bad.

Mark
 
#7 ·
Might be a shot in the dark, but i've had the same issue while driving once, bike would just cut out and die in the middle of corners nearly crashing me.
Drove home, and noticed the negative battery cable screw was loose causing it disconnect every now and then.
 
#10 ·
I read somewhere, bad wiring behind the front fairing, if you take the windshield out and look down with a torch, check for wires running through a bracket haven't stripped and are shorting out, at the worst time, mid corner. I checked mine to be safe, and wrapped extra tape around them..
 
#11 ·
If the shop told you that the fuel pump was NOT pumping out at enough PSI, then that’s your problem.

The bike will run but will randomly shut of if the fuel pressure is not right.

Ask them if they pressure tested the fuel pump.

The fuel pump could have everything to do with it.