Idle got the best of me! : Yamaha R6 : R6 Forum

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Old 12-06-2012, 04:53 PM   #1
bgballin26
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Idle got the best of me!

Some of you may know i have been fighting an idle issue for awhile now, i did sync my carbs and they were not that bad out of sync. My symptoms are bouncy idle, i have to keep it idled at 1800 rpms because when it drops, it drops down to 1200, the other symptom is when it is idling, if i crack the throttle and rev it to say 7k and let it fall, when it drops back down to idle it almost dies and sometimes it does die. I think that would mean the bowls are running out of gas? But i really don't know so i'm asking for some opinions. My settings are:

Factory Pro 155 & 150 mains
Factory Pro #40 pilots
OEM airfilter
OEM needles with 2 shims (1mm)
screws 2.5 out
elevation is 875' above

I pretty much rode with it like this all summer, but i'm about to tear it apart for the winter and would like to know what i should change or check.
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Old 12-11-2012, 06:53 AM   #2
cmedrive
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Re: Idle got the best of me!

Tear down the carbs and clean them well. I swear that fixes 90% of the problems, haha. Check the float levels and look for any vacuum leaks. Also make sure you buy new gaskets for the float bowls, you don't want them leaking after you put all that work into cleaning and rebuilding them.
I never had a bouncy idle on my '01 so I never had to diagnose that problem.
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Old 12-11-2012, 07:38 AM   #3
natedogg624
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Re: Idle got the best of me!

sporadic idle is usually an indicator of vacuum leak.
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Old 12-11-2012, 09:33 AM   #4
bgballin26
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Re: Idle got the best of me!

I have had the carbs off 5 times trying to get them tuned right, it seems like when i went to the bigger pilots is when i developed the idle problem. I'm about to take them off again, i will check all my vacuum lines, i'm sure they are hardened and could be cracked.
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Old 12-11-2012, 09:35 AM   #5
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Re: Idle got the best of me!

Quote:
Originally Posted by bgballin26 View Post
I have had the carbs off 5 times trying to get them tuned right, it seems like when i went to the bigger pilots is when i developed the idle problem. I'm about to take them off again, i will check all my vacuum lines, i'm sure they are hardened and could be cracked.
Make sure you get the boots that hold the carbs to the bike tight bro. They are so hard to get to, it's easy to have a loose one, and the bike may run good when on it, but lope or have a shitty idle. Infrared gun indicated I had a cooler cylinder and then I realized it was the boot making that one cylinder suck at idling.
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Old 12-11-2012, 02:28 PM   #6
bgballin26
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Re: Idle got the best of me!

Ok, one thing i have not checked was the temp of each header tube, thanks for the info
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Old 12-11-2012, 05:56 PM   #7
bgballin26
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Re: Idle got the best of me!

Here is a crappy video taken from my phone, the idle was not bouncy here, it comes and goes. I did notice the tip of my exhaust has turned black, so i'm thinking it's a tad rich.

http://youtu.be/RHnNg0YFaDI
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Old 12-11-2012, 06:00 PM   #8
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Re: Idle got the best of me!

Jesus it sounds like a chopper with that lope bro. Check the exhaust headers to see which cylinder is dead. It could very well be that it's not running on all 4.
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Old 12-11-2012, 06:05 PM   #9
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Re: Idle got the best of me!

yea it sounds like a massive miss to me as well....
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Old 12-11-2012, 06:16 PM   #10
bgballin26
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Re: Idle got the best of me!

It has always had that choppy sound since i cut the exhaust, and also the sound quality of my phone makes it sound worse then it really does. Last time i checked the plugs they looked alittle rich, but no sign of a cylinder not hitting. I will check the temps of each header tube tomorrow. Like i said the bike runs amazing, runs hard all the way to red line, just the bouncy idle, which is not consistent. I'm hoping santa will bring me a Go Pro so i can get some good video's of my bike in action, i have some nice twisties around here where i can get wfo in between curves.

It's 40 degrees outside when i shot this video and the bike was not warmed up all the way. Before i turned the choke down it was idling right at 2000 rpms
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