2013 Ninja 636 stalling issues - Page 2 - ZX6R Forum
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post #16 of 41 Old 02-16-2014, 05:05 PM
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Sub throttle?? Can you elaborate?
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post #17 of 41 Old 02-16-2014, 05:17 PM
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That would be supremely annoying.
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post #18 of 41 Old 02-17-2014, 09:56 PM Thread Starter
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Originally Posted by GreenDemon View Post
I don't understand. Are you saying that if you coast to a stop without using the brake it stalls, but if you use the brake it doesn't?
Yes....At our apartment complex we have speed bumps and when I slowed down to nearly a stop going over them the motor stopped. It doesn't seem to do it when I creep to a stop using the brakes. It did it for 1 day and hasn't done it since.
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post #19 of 41 Old 02-17-2014, 10:51 PM
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What's the ambient temperature when this happens? Are you waiting for the bike to warm up per the manual...4-5 minutes if I remember right. Mine will usually die only one time, right after the first start attempt if the ambient temp is below 60 F. After the second ignition sequence she will light right off, warm up for five minutes and I never have a problem after that.
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post #20 of 41 Old 02-18-2014, 12:03 AM
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That happens sometimes on on my 04 zx6r too, I just rev it a little when I feel the rpms dropping too low. No idea whats the problem though.
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post #21 of 41 Old 02-18-2014, 12:24 AM
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My bike does it only on the first ride. That is if I either place it in neutral or hold the clutch it simply stalls. Once the engine temp exceeds 150 it no longer does that. Weird :/
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post #22 of 41 Old 02-18-2014, 12:38 AM
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Fuel System
DFI® with four 38mm Keihin throttle bodies and oval sub-throttles.

Ok so if you look down the throttle bodies ( take the airbox off) you will see a set of butterfly's which are activated by the throttle grip - so open it up by twisting the throttle (engine off of course) you will see underneath at the bottom of the bodies another set of butterflys - these are the sub throttles.

The sub throttles are controlled by the ECU via a stepper motor if you look to one side of the rod (cant remember which) you will see a little black pot with some wires coming out - this is the position sensor which tells the ECU where the sub throttle is.

If the sensor is incorrectly positioned the sub throttle will shut the throttle bodies completely thus causing a stall.

The sub throttle is there for a few reasons.

1/ to stop the engine stalling when you shut off with a cold engine (it holds open when the engine temp is lower than a set parameter in the ECU)
2/ stops rear wheel hop when you shut off quick by holding open and allowing the engine to run on

Some people remove the sub throttles to get better engine response - I think they are missing the point.

Feel free to play with the position sensor (its mounted on a spigot with a lock screw) in one direction it will hold the engine on too much - in the other the engine will stall on shut down. now think of the possibilities in terms of hold on/shut off.....

Lots of people remark about a sound ,sort of stuttering, when they first switch on - that's the sub throttle homing and can indicate that it has been incorrectly set.

Let em know how you get on :-)
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post #23 of 41 Old 02-18-2014, 12:39 AM
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Quote:
Originally Posted by Marc ss View Post
Sub throttle?? Can you elaborate?
OOps sorry see above
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post #24 of 41 Old 02-18-2014, 02:40 AM
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Ooops again - the position is set at the factory - not a lot of dealers techs would look at this...
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post #25 of 41 Old 02-18-2014, 03:47 AM
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Oldboyonrgv are you kawa tech by any chance?

I wouldn't be recommending any novice to be doing what your asking them to do.
Im a qualified mechanic and I still wouldnt be toying with that shit without a OBD tool.

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Step one, take pussy for a ride on your ninja. Step two Ride pussy like your ninja. Step three, rinse and repeat.
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post #26 of 41 Old 02-18-2014, 03:59 AM
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I guessed that anyone who is willing to delve that far into the bike would probably not be a novice, they would probably run to their nearest dealer - but just might ask for the sub throttle setting to be checked.

Its a pretty no risk adjustment - the worst that can happen is that the sub throttle will hold the revs on a little on shut down but if you suss it out you can actually do the adjustment with the engine running and see the results.... before riding.

Playing with the sub throttles is part of the strategy used in the racing game....

I am NOT a Kawasaki Tech, and wouldn't claim to be so....

See here for some of my experience Ok Hello
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post #27 of 41 Old 02-18-2014, 04:38 AM
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Quote:
Originally Posted by oldboyonrgv View Post
Fuel System
DFI® with four 38mm Keihin throttle bodies and oval sub-throttles.

Ok so if you look down the throttle bodies ( take the airbox off) you will see a set of butterfly's which are activated by the throttle grip - so open it up by twisting the throttle (engine off of course) you will see underneath at the bottom of the bodies another set of butterflys - these are the sub throttles.

The sub throttles are controlled by the ECU via a stepper motor if you look to one side of the rod (cant remember which) you will see a little black pot with some wires coming out - this is the position sensor which tells the ECU where the sub throttle is.

If the sensor is incorrectly positioned the sub throttle will shut the throttle bodies completely thus causing a stall.

The sub throttle is there for a few reasons.

1/ to stop the engine stalling when you shut off with a cold engine (it holds open when the engine temp is lower than a set parameter in the ECU)
2/ stops rear wheel hop when you shut off quick by holding open and allowing the engine to run on

Some people remove the sub throttles to get better engine response - I think they are missing the point.

Feel free to play with the position sensor (its mounted on a spigot with a lock screw) in one direction it will hold the engine on too much - in the other the engine will stall on shut down. now think of the possibilities in terms of hold on/shut off.....

Lots of people remark about a sound ,sort of stuttering, when they first switch on - that's the sub throttle homing and can indicate that it has been incorrectly set.

Let em know how you get on :-)
Good info...
Thanks
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post #28 of 41 Old 02-18-2014, 11:14 PM Thread Starter
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I think the problem is a warm up issue. It doesn't seem to stall after warming up. I noticed at stop though that the temp will rise to around 210 f. Is it good for the engine to be running hot at 210 f or in that general area?

Last edited by Lucas; 02-18-2014 at 11:20 PM.
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post #29 of 41 Old 02-18-2014, 11:49 PM
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Hmm that's about 10 deg C hotter than ideal
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post #30 of 41 Old 02-25-2014, 01:09 AM
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Quote:
Originally Posted by Lucas View Post
I think the problem is a warm up issue. It doesn't seem to stall after warming up. I noticed at stop though that the temp will rise to around 210 f. Is it good for the engine to be running hot at 210 f or in that general area?
That's part of the sub throttle function - I give up!!
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