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Discussion Starter #1 (Edited)
Should you be able to redline in neutral? (VIDEO)

Searched but didn't find anything on this subject.

I just tried it, and I cant, something I need to worry about?
I took a video to show a buddy, maybe I can post it up here.

thanks!
Roms

EDIT: here's a video. I have it open throttle until it drops back down to idle....... I doesn't just die.
In addition, while riding, it bogs out at 10k. Everyone's been saying it's a fuel pump, but it SHOULD still reach redline in neutral... right?

EEK!

 

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Discussion Starter #4
spark plugs are fine, that was after JUST putting them back in.

Pinched fuel line? I've checked half a dozen times, but I don't know what the lines are doing when I put the tank back down..
 

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spark plugs are fine, that was after JUST putting them back in.

Pinched fuel line? I've checked half a dozen times, but I don't know what the lines are doing when I put the tank back down..
yeah maybe, get in there and look every thing over. you unplug something and forget to plug it back in? retrace your steps.
 

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Discussion Starter #6
This has been going on for months (bogging out at 10k) i only recently tried to reline in neutral to see.

Could a fuel pump cause this? I wouldn't think so because there is no strain on the motor to propel the bike, I would think it could keep up.
 
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Bad fuel pump, clogged fuel line, pinched line. Breather tube is ruled out since you'd be complaining about a caved in tank.

Lift the tank and measure the flow rate. You're going to have to jump the fuel pump relay. I believe it's the brown and black/white wires. Not sure if they're the same color as the newer bikes.

First measure to make sure at least 12v is getting to the fuel pump at the plug.
With the fuel line disconnected and fuel pump relay jumped, turn the ignition on for 10 seconds with the pump flowing fuel into a graduated cylinder. You should have a minimum of 167cm^3 (5.6oz).

If the voltage at the plug is below 12v, there is a problem in the wire harness. If the voltage is good but the amount of fuel that came out is below those specs, there's either a clog in the fuel line somewhere. If there is no clog, the fuel pump is bad.
 

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Discussion Starter #10 (Edited)
This has been like.. the 5th problem you have helped me with demented! Damn dude. Ill have to try it.

off to find a graduated cylinder.

how do I jump the relay with the brown and black wires? sorry that sounds like a stupid question...
 

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Cant see why you would need to jump the relay, just turn the ignition on and it will pump, with the fuel line disconnected it wont develop any pressure and as such the pump will stay on.
 
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Cant see why you would need to jump the relay, just turn the ignition on and it will pump, with the fuel line disconnected it wont develop any pressure and as such the pump will stay on.
You need to jump the relay otherwise it will only prime. You need the pump running for 10 seconds for the test.
 

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But without pressure building in the discharge line the pump will continue to try and prime the system for the ten seconds, unless the ecu is controlling the fuel cut relay which i doubt is the case.

OP, Demented is probably right - he usually is, but try just turning it on with the fuel line disconnected, my bet is that it works and if it doesn't there is nothing lost eh?
 
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But without pressure building in the discharge line the pump will continue to try and prime the system for the ten seconds, unless the ecu is controlling the fuel cut relay which i doubt is the case.

OP, Demented is probably right - he usually is, but try just turning it on with the fuel line disconnected, my bet is that it works and if it doesn't there is nothing lost eh?
I'm not sure if the ECU controls the relay or not, but I'm inclined to think so as Honda calls for jumping the relay.
 

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Its just that the fuel pressure is controlled by the pump itself, once pressure is reached pump goes off, once it drops pump comes on.

I know that the ecu has an active low output that goes to the fuel cut relay but I think that is only there to cut fuel and prevent damage and for HISS implementation, the ecu has no idea what the fuel pressure is at so cannot control it reliably. It could work out (given rpm, injector pulse widths and injector size) how much fuel is being used but that doesn't account for slightly differing flow rates from the pumps and when your talking about those pressures you don't really want to take chances.

Its also pressure controlled as is evident in that when you first turn the bike on it takes a little while (relatively speaking) to prime, if you then turn it off and straight back on the prime time is almost non existent, again pointing to the ecu not controlling it.
 

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Discussion Starter #18
Good to know Nico, thank you. but I think i'll still try to jump the relay. But how do you jump it?
 
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Good to know Nico, thank you. but I think i'll still try to jump the relay. But how do you jump it?
If you have a service manual, look under the FI section. Where the fuel pump area is, it should show. If someone can confirm that the wiring is the same from 03-06 to 07-10, I can post a snap shot.
 
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