Bike starts cold just fine, but then wont restart without opening throttle. - ZX6R Forum
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post #1 of 9 Old 03-07-2017, 04:26 PM Thread Starter
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Bike starts cold just fine, but then wont restart without opening throttle.

08 ZX6R, 8k miles.

I just got the valve cover gasket TCB done by Kawaski. I also had them check the valves while they were in there. They said everything went fine.

When I was leaving the shop, I put it in first with the kikstand down and it died and then it refused to restart. Finally after messing around with it for a few minutes I got it easily started by applying a little throttle while holding down the start.

Once it is warmed up I no longer have any issues. But I can reproduce this every morning (by simply turning off the bike via the key a few seconds after starting it). I dont remember having this issue before the shop got it. Should I give the shop a call?

Last edited by Tuneix; 03-07-2017 at 04:30 PM.
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post #2 of 9 Old 03-07-2017, 06:40 PM
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Check the idle speed, first..... might have changed lower since the tune up.
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"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #3 of 9 Old 03-07-2017, 06:49 PM Thread Starter
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Originally Posted by RJ2112 View Post
Check the idle speed, first..... might have changed lower since the tune up.
Tested this out, seems to have worked! What should I have it idle at when warm? 1.5k?
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post #4 of 9 Old 03-07-2017, 07:31 PM
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1.5 is fine.
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post #5 of 9 Old 03-08-2017, 06:04 AM
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^^ yup.

glad it's a fairly simple thing.

The amount of power it takes to keep the motor running is pretty small -- getting the bike to idle at a set speed is sort of a cr@p shoot. When the valves get adjusted, that changes the airflow, with a significant impact at idle. Same thing with changing the air filter, and going to a much less restrictive exhaust.

The differences between the cylinders' performance will also affect idle speed.

If you want it to run smoother, and be slightly more efficient, get the throttle bodies synchronized. That's a process of balancing each cylinder so all are making equal power.

"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #6 of 9 Old 03-08-2017, 06:10 AM Thread Starter
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Originally Posted by RJ2112 View Post
^^ yup.

glad it's a fairly simple thing.

The amount of power it takes to keep the motor running is pretty small -- getting the bike to idle at a set speed is sort of a cr@p shoot. When the valves get adjusted, that changes the airflow, with a significant impact at idle. Same thing with changing the air filter, and going to a much less restrictive exhaust.

The differences between the cylinders' performance will also affect idle speed.

If you want it to run smoother, and be slightly more efficient, get the throttle bodies synchronized. That's a process of balancing each cylinder so all are making equal power.
Now its no wonder they expose the idle screw to the rider.
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post #7 of 9 Old 03-08-2017, 07:49 AM
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With an EFI bike, controlled by an ECU, the amount of fiddling the operator needs to do is almost completely removed. Almost.

The knob is there, because of that last little bit that isn't as easily dealt with.

In the days of carbs, and chokes just keeping a bike running until it warmed up enough to idle smoothly was an art form in itself.

Going back further, learning to kick start a big bore single cylinder bike was even more of a challenge.

"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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post #8 of 9 Old 03-08-2017, 10:47 AM Thread Starter
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Originally Posted by RJ2112 View Post
With an EFI bike, controlled by an ECU, the amount of fiddling the operator needs to do is almost completely removed. Almost.

The knob is there, because of that last little bit that isn't as easily dealt with.

In the days of carbs, and chokes just keeping a bike running until it warmed up enough to idle smoothly was an art form in itself.

Going back further, learning to kick start a big bore single cylinder bike was even more of a challenge.
Yeah, I may need to fiddle with it to get it just right. If I set it to 1.5k at 150+ degrees then starting when cold is harder. Im sure there is a sweet spot.
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post #9 of 9 Old 03-08-2017, 10:59 AM
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Yeah, I may need to fiddle with it to get it just right. If I set it to 1.5k at 150+ degrees then starting when cold is harder. Im sure there is a sweet spot.
Idle speed is really unimportant, if it is higher than the minimum it will run at..... If it's under 2K, probably good enough, and that's more a matter of not annoying the neighbors, etc.

Engine speed when you are not riding matters, when it comes time to charge the battery. The alternator doesn't produce enough output when the RPM is below ~ 2500 to actually provide any energy to the battery.

"Basic stuff fellas. Use your head for something other than to break your next fall."

"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "
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