31 replies to this topic

[Catteeclan]

I am following this with great interest as the smoothing of throttle response will greatly improve the 9er.

Me too. 

[fixitsan]

I am following this with great interest as the smoothing of throttle response will greatly improve the 9er.

 

What I know so far is that you can go ahead and ground the neutral switch wire to cancel fuel cutting. You don't need to even disconnect the neutral switch first, as far as I can tell, if you just want to try it out temporarily to see if you feel it helps with riding smoothly

 

The negatives are that the neutral light will always be on, and starting the bike in gear might be possible without pulling the clutch in.(but if you know it's in neutral, it won't be an issue)

 

I'm just this moment looking at a bypass relay. A cheap module from ebay, with a built in timer and a relay - as long as the module gets pulses from the front sprocket sensor (or wheel speed sensor on an ABS equipped bike) it will deactivate the neutral lamp circuit, by keeping it open to extinguish the neutral lamp while the bikes moves forwards. This would need connections to at least 2 wires in the harness, as well as 12V, and GND. By adding another wire connection it could be made so that it automatically disconnects the neutral grounding wire circuit if the engine isn't running, meaning that starting up would be the same as it is now, with no risk of starting while in gear.

 

I might make something myself though. It would need to be 'optically isolated' for safety, this means that only a miniscule amount of current is taken from the host circuit in order to read the sensor, without any risk of shorting it out while riding .

 

When I come up with a fix which is a bit more elegant than a piece of black tape over the neutral indication lamp I'll post a message about it here. But for now I'm going to live with a simple switch while I have a think about

Edited by fixitsan, 30 September 2024 - 09:30 am.

[fixitsan]

I've just ordered one of these. It has the time delay, the 5V pulse input, and optical isolation all together on one PCB.

 

If it works it's a cheap fix !

 

https://www.ebay.co....emis&media=COPY

[fixitsan]

I got another 70 miles of play over the weekend, and I'm convinced that riding is much smoother and easier with the neutral switch grounded.

 

I haven't got much further with making something to automate it, but a simple switch works fine for now

[Coxylaad]

I messed about with overrun fuel cut on my 900 with the standalone ecu.  I found that adding fuel on the overrun at high rpm made no discernible difference, but lower that 3500rpm and pushing a small amount of fuel into the bores made a big difference to how the bike behaved from a closed throttle. It ended up feeling like a really nice carb setup once I had it dialled in. 

 

this is next level though ^^ 

[fixitsan]

I messed about with overrun fuel cut on my 900 with the standalone ecu.  I found that adding fuel on the overrun at high rpm made no discernible difference, but lower that 3500rpm and pushing a small amount of fuel into the bores made a big difference to how the bike behaved from a closed throttle. It ended up feeling like a really nice carb setup once I had it dialled in. 

 

this is next level though ^^ 

Oh no not now it isn't !

 

It's a just a switch to ground the neutral switch out at the moment. Works a treat

 

But what I've ordered to play about with is a small accelerometer, so that it will detect braking and just act when decelerating. And as soon as the bike comes to a stop the neutral switch and neutral light will behave as normal

 

But I don't know how to turn off the neutral light on the dash when it activates _without cutting the harness_.

I might just install a bit of tinted film over the neutral light so it can still be seen if you look at it, but it just won't be as bright as normal.

[Snowbird]

Just had a quick glance at a 900 wiring diagram and it looks like the offending link to remove may be shown here between starting cut off relay and ecu, try it with the black/yellow wire removed from ecu connector plug and insert a new grounded terminal so ecu thinks it's in neutral but neutral light still works as normal, will likely mean side stand switch won't operate anymore and you can start in gear with stand down but we all survived for years without that function I'm sure.

 LOOM.jpg   171.54KB   1 downloads

[fixitsan]

Just had a quick glance at a 900 wiring diagram and it looks like the offending link to remove may be shown here between starting cut off relay and ecu, try it with the black/yellow wire removed from ecu connector plug and insert a new grounded terminal so ecu thinks it's in neutral but neutral light still works as normal, will likely mean side stand switch won't operate anymore and you can start in gear with stand down but we all survived for years without that function I'm sure.

LOOM.jpg

 

Thanks for clarifying. I only gave it a brief look and thought the wire from the ECU went to the L/Y wire, spent a few hours scratching my head, then a closer look with the correct glasses showed there is no dot on the crossover of those wires !

 

I'll just go give that a try...

[Catteeclan]

Just had a quick glance at a 900 wiring diagram and it looks like the offending link to remove may be shown here between starting cut off relay and ecu, try it with the black/yellow wire removed from ecu connector plug and insert a new grounded terminal so ecu thinks it's in neutral but neutral light still works as normal, will likely mean side stand switch won't operate anymore and you can start in gear with stand down but we all survived for years without that function I'm sure.

LOOM.jpg

That's the early 2002 model same as mine and is exactly what I was thinking.

[fixitsan]

Just had a quick glance at a 900 wiring diagram and it looks like the offending link to remove may be shown here between starting cut off relay and ecu, try it with the black/yellow wire removed from ecu connector plug and insert a new grounded terminal so ecu thinks it's in neutral but neutral light still works as normal, will likely mean side stand switch won't operate anymore and you can start in gear with stand down but we all survived for years without that function I'm sure.

LOOM.jpg

 

 

T H A T   W O R K S  

 

I cut the black/yellow wire about 2 inches from the ECU plug, grounded the ECU side and there's now no fuel cut. If left ungrounded then fuel cut happens .

 

A N D

 

You can't start it in gear. the stand-down function works exactly the same too.

 

A N D

 

The neutral light works as normal

 

A perfect solution !

Many Thanks Snowbird !

Edited by fixitsan, Yesterday, 05:58 pm.

[fixitsan]

This is the Black/Yellow wire...

 

 20241016_190808.jpg   98.1KB   0 downloads

 

 

I made up this wire...

 

 20241016_192115.jpg   164.39KB   0 downloads

 

 

Attached a terminal at the ECU side...

 

 20241016_193019.jpg   110.94KB   0 downloads

 

 

Cleaned the front screw of the left ignition coil, sprayed with terminal cleaner/lube and added a star washer

 

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The wire in position, terminals sprayed with chain wax to keep the water out...

 

 20241016_193205.jpg   136.79KB   0 downloads

 

 

 

 

There is also at least one ground wire at the same ECU plug as the black/yellow wire, which would work just as well

Edited by fixitsan, Yesterday, 07:00 pm.

[fixitsan]

Adding a switch would be relatively easy

 

 switch.jpg   24.15KB   0 downloads