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Discussion Starter #1
2006 600rr with a Yoshi RS5 slip-on. Factory Air filter. No Powercommander.

When I start my bike on a cooler morning it sounds like a subaru and it's not a smooth idle. I replaced the plugs recently as one of them fouled out. This fixed that cylinder not burning but it will still randomly do this. I'll be riding and it sounds like the ecu goes full rich or lean in a map and makes it sound like a subaru and then it'll kick back in and run normally and good.

This doesn't only happen at start up in the morning either. This happens after the bike is warm as well. Blipping the throttle does not solve the issue either. This makes the hard kind of unpredictable coming into corners or even starting off as i have a significant power loss.
 

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Not sure if cylinder is dying or which one it is but the last time it happened i checked the headers and all of them were hot.
 

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You said that the bike does this on colder mornings. Next time it starts to act up, feel around the headers to see which cylinder isn't firing. I suggest getting a cheapo IR thermometer if you have any love for your fingers. Once you have that narrowed down, go through the wiring to the injectors and spark plugs on the dead cylinder to make sure nothing is loose or exposed. At least that's where I would start.

Do you have anything that modifies the fueling? If you do get rid of it while you troubleshoot.
 

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When I start my bike on a cooler morning it sounds like a subaru and it's not a smooth idle.
I have a 2003, with similar kind of thing. Almost sounds "lumpy" like it has a cam. When I set the idle to 1400rpm it's smooth, but, 1300/1200 it is a bit lumpy.

Bike runs fine though, so never bothered looking into it, just figured it's because RPM is low @ 1200.
 

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You said that the bike does this on colder mornings. Next time it starts to act up, feel around the headers to see which cylinder isn't firing. I suggest getting a cheapo IR thermometer if you have any love for your fingers. Once you have that narrowed down, go through the wiring to the injectors and spark plugs on the dead cylinder to make sure nothing is loose or exposed. At least that's where I would start.

Do you have anything that modifies the fueling? If you do get rid of it while you troubleshoot.
No modifications that I know of. I'll have to check that little box on the side to see if a PC is hidden in there but P.O. told me all stock. It has been dumped before so maybe some wires got loose some where.

The idle is just fine when starting it. it idles high and i have it adjusted for 1500ish and when this happens it drops below 1500 and then when it stops occuring it goes back to 1500ish. When it drops below its very lumpy and subaru sounding obviously.

This does not only happen with cold starts though. It happend to me at the track this weekend when I have gone through half a tank.
 
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