Coming Off Throttle, Bike Stalls? - Page 2 - ZX6R Forum
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post #16 of 21 Old 08-28-2014, 11:27 AM Thread Starter
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Originally Posted by kingofthehil View Post
Dont know if it helps, but my B2H was in the shop for 4 weeks trying to diagnose a problem where it stalled off throttle and wouldn't start again immediately. Sometimes did sometimes didn't.

After working through everything they found that the cable loom on the right hand side below the tank (and feeding the throttle position sensor) was shorting to the frame intermittently. Re-insulated - now runs perfectly!!
What year was your bike?

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post #17 of 21 Old 08-30-2014, 03:21 PM
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Ugh, this isn't ever an easy thing to diagnose. The issue that you're having is a secondary effect, and it could be caused by about a dozen things.

But before I start giving you things to go check, here is what I believe is happening. The main symptom of the problem is a poor air/fuel ratio at lower rpm (and possible throughout the whole range). It isn't necessarily going to be bad enough to notice while idling without moving, but, as you are riding and let off the throttle, the rapid air pressure change in the intake box makes the air/fuel ratio go so far from ideal that it doesn't make enough power to keep the engine running. By increasing your idle speed, it just means that when you let off the throttle again while moving, the engine still generates enough power to continue running; however, there isn't correcting the main problem, just treating the apparent symptoms.

Anyhow. As already said a few times, you should check that your throttle bodies are sync'd.
Beyond that, I'd force the subthrottle to stay open and make sure that isn't an issue. Check that your inlet air temp sensor is reading properly, IIRC it is an RTD so you'll just need an ohm meter and another temp probe that you trust. Same thing with the inlet air pressure and atmospheric pressure sensors.
And then....fuel pressure could be bad, either because the pressure regulator, fuel filter, or the pump itself is having issues.
I too believe it's your A/F ratio. My bike has done it for a while after I messed with my map on my Bazzaz. I have a map switch so one is leaner than the other and my other map doesn't do it. Exactly like how you describe it.

However, since your bike is stock, I couldn't tell you. Something along the lines of what Steel said

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post #18 of 21 Old 09-01-2014, 05:09 PM Thread Starter
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I too believe it's your A/F ratio. My bike has done it for a while after I messed with my map on my Bazzaz. I have a map switch so one is leaner than the other and my other map doesn't do it. Exactly like how you describe it.

However, since your bike is stock, I couldn't tell you. Something along the lines of what Steel said
I agree too...it feels like the bike isn't getting enough air into the system. I would think the culprit would most likely be tb's that are somehow getting stuck in the closed position. I think I'm going to have to invest in a tb sync tool and make sure they are all synced together.

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post #19 of 21 Old 09-13-2014, 03:59 PM Thread Starter
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I finally got to taking apart the fuel pump today. The filter was pretty dirty so I cleaned everything out. I have a hard time imagining though that would be the cause of this problem but you never know. I check all wires and nothing was grounded by accident. I ran the diagnostics test too and got back no FI errors, so I don't think any of the inlet air temp/pressure sensors are at fault. If it still happens then I'll have to invest in a TB sync tool and hope that fixes the peoblemo. I'm going on a lengthy ride tomorrow morning so I should have an idea of how the bike's running.

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post #20 of 21 Old 08-12-2019, 08:30 PM Thread Starter
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I can't believe it's been almost 5 years to the date.

Though I want to give a brief update in part due to the fact that I just rebuilt the engine, and, because it grinds my gears when the OP doesn't post his/her fix or solution to their original issue.

Conclusion: The issue was exhaust valve clearances which were too tight! I measured them at nearly 0.12mm to 0.16mm across the board!

Hopefully this helps others in search of resolution to a similar problem.

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post #21 of 21 Old 08-12-2019, 10:06 PM
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