919 idle - Wrist Twisters
 
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post #1 of 11 Old 06-04-2012, 11:37 AM Thread Starter
Milites Gregarius
 
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919 idle

This probably a silly question, but my 2007 919 idles kind of strange.

I goes rev-rev-rev-rev at about 3 cycles per second. Is this normal?

Ralph

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post #2 of 11 Old 06-04-2012, 01:30 PM
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A small amount of variation in idle speed is normal, but if the idle speed is set too high or there is a vacuum leak the system may misinterpret it as a non idle condition and cause a hunting idle speed.

Check the average idle speed with the engine at operating temp and if it goes over 1,500 rpm drop the idle with the adjust knob located on the left side of the throttle body under the tank. If the idle doesn't drop there may be a physical block preventing the throttle from completely closing or a vacuum leak. Either way you'll have to do a thorough inspection (tracing all those vacuum hoses can be a bit of a hassle).

There may also be a problem with the fuel pressure regulator leaking fuel into the #2 and 3 cylinders as well, but at the moment it doesn't sound like it.

What modifications have you / the previous owner done? It may relate to your symptom.

Rob

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On the other hand, if it has not been done never assume it is impossible to do it.
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post #3 of 11 Old 06-04-2012, 04:05 PM Thread Starter
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Thanks for the reply. There have been no mods. Still stock in every way. Bike is running fine, just not a constantly smooth idle. Just kind a goes vrm, vrm, vrm, vrm on a repeating basis really fast. Somewhere around three vrms a second.

I will check idle speed and adjust accordingly.

I wonder if there are any YouTube videos of a normal 919 idle? Will have to do some searching.

Ralph

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post #4 of 11 Old 06-04-2012, 06:05 PM
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first few sec before he revs it

[youtube]rAUPrQXYFF8[/youtube]
[youtube]NxmjMNy6tnY[/youtube]

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post #5 of 11 Old 06-04-2012, 07:29 PM
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This is how mine sounded...

919 Idle - YouTube

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post #6 of 11 Old 06-04-2012, 08:06 PM
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Quote:
Originally Posted by RalphLong View Post
This probably a silly question, but my 2007 919 idles kind of strange.

I goes rev-rev-rev-rev at about 3 cycles per second. Is this normal?

Ralph
Had the same thing with my idle, I did a starter valve synchronization adjustment and it smoothed out my idle... I had one throttle body vacuum off quite a bit..

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post #7 of 11 Old 06-05-2012, 03:40 AM
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CB900F2: what was the mileage when you did the synch?

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post #8 of 11 Old 06-05-2012, 04:22 AM Thread Starter
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Quote:
Originally Posted by CB900F2 View Post
Had the same thing with my idle, I did a starter valve synchronization adjustment and it smoothed out my idle... I had one throttle body vacuum off quite a bit..
Interesting. Can you point me in the direction for some instructions on how to do this?

Ralph

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post #9 of 11 Old 06-06-2012, 03:55 AM
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I had about 40,000km when I did the adjustment...


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CB900F2: what was the mileage when you did the synch?

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post #10 of 11 Old 06-06-2012, 03:56 AM
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Hi Ralph.... The adjutsment process is in the shop manual.. starting at page 5-68

regards


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Originally Posted by RalphLong View Post
Interesting. Can you point me in the direction for some instructions on how to do this?

Ralph

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post #11 of 11 Old 06-06-2012, 04:47 AM
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40000 for the starter valve adjustment is reasonable.... very reasonable. This explains why one was off.... thank you for the info.

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