Engine farts and coughs while slowing down and dropping revs - 600RR.net
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post #1 of 21 (permalink) Old 08-28-2018, 01:01 PM Thread Starter
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Engine farts and coughs while slowing down and dropping revs

2008 CBR600RR

When letting go of the throttle to slow down by engine braking, I hear "farts" and "coughs" coming from the bike versus the sound of the engine slowly dropping revs. It's fuel injected, but i've only had a similar experience with a carb-bike.

The solution "Well don't let go of the throttle then!" won't work for me. LoL

Regardless of the sounds, the slowdown feels smooth. But if an injector is clogged or something, I wanna do something about it.



Any ideas?
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post #2 of 21 (permalink) Old 08-28-2018, 04:26 PM
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Do you have and aftermarket exhaust and the pair system still in place?

Could also be an exhaust leak
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post #3 of 21 (permalink) Old 08-28-2018, 05:21 PM Thread Starter
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Quote:
Originally Posted by wibbly View Post
Do you have and aftermarket exhaust and the pair system still in place?

Could also be an exhaust leak
Ah yes @wibbly. The guy I bought it from deleted the PAIR system. Any benefit of keeping it off the bike? Or will I benefit more putting it back on?
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post #4 of 21 (permalink) Old 08-28-2018, 06:42 PM Thread Starter
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I've been reading that it's only useful if you are going to dyno it to get accurate readings. And that ties into getting a power commander. Also minimal weight savings.

No power commander anytime soon; I'll restore the config.

Thanks again @wibbly (once again) for pointing me in the right direction! ;)
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post #5 of 21 (permalink) Old 08-28-2018, 08:01 PM
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the pair system is what causes farting and sputtering on decel. it happens when you have air in the exhaust. it's either the pair introducing air, a leak in the pair system blocking plates, or an exhaust leak.
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post #6 of 21 (permalink) Old 08-28-2018, 08:19 PM
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Pair doesn't cause popping otherwise every stock bike would do it.

'06 F4i- Yoshimura RS-3C, Racetech springs and valves, Ohlin's rear shock, steel brake lines, 520 conversion. 87k miles and counting.....
'08 600RR- Stripped trackbike. CRG shorty brake lever, goodridge front brake lines
'15 1000RR- weekend toy
------Disclaimer: I can't spell------
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post #7 of 21 (permalink) Old 08-28-2018, 08:52 PM
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pair doesn't cause popping when the bike is fitted with a proper muffler and a catalytic converter.
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post #8 of 21 (permalink) Old 08-28-2018, 09:49 PM Thread Starter
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Quote:
Originally Posted by wibbly View Post
pair doesn't cause popping when the bike is fitted with a proper muffler and a catalytic converter.
I got both, but no PAIR! So PAIR's going back on

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post #9 of 21 (permalink) Old 08-28-2018, 10:33 PM
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That won't fix it lol
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post #10 of 21 (permalink) Old 08-28-2018, 10:35 PM Thread Starter
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Originally Posted by wibbly View Post
That won't fix it lol
Damnit.
So possibly leaky exhaust?
Will taking the time to put the PAIR back on benefit me at all? Or not worth it?

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post #11 of 21 (permalink) Old 08-28-2018, 10:55 PM
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no don't put it back on it doesn't do anything you need.


check the pair plates and make sure they're well sealed. same for the exhaust.
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post #12 of 21 (permalink) Old 08-29-2018, 11:59 AM Thread Starter
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Quote:
Originally Posted by wibbly View Post
no don't put it back on it doesn't do anything you need.


check the pair plates and make sure they're well sealed. same for the exhaust.
No PAIR plates!
Just rubber caps on the columns the PAIR hoses are supposed to attach to.

Do you think plates will make the difference?
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post #13 of 21 (permalink) Old 08-29-2018, 01:00 PM
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Probably not. The system just needs to be sealed off

As long as the caps are well secured it should be fine
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post #14 of 21 (permalink) Old 09-07-2018, 01:39 PM
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I'm having a similar issue, just posted a thread about it. I'm curious to see if its the same thing, because we have the same bike! Does your engine braking also not work? That was my first giveaway when I bought this bike.
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post #15 of 21 (permalink) Old 09-07-2018, 07:45 PM Thread Starter
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Yo @Simon Jones, everything works on my bike. Just hearing pops when decelerating after letting go of the throttle, but the bike slows down properly (engine braking is good).

Post the link to your thread so the experts here can check it out!
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post #16 of 21 (permalink) Old 09-07-2018, 07:49 PM
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Exhaust has nothing to do with engine braking.
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post #17 of 21 (permalink) Old 09-07-2018, 10:09 PM
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Wibbly, yeah, I know. Engine braking is totally dependent on intake vacuum. I just wanted to see if there were similar symptoms. Here’s my thread: https://www.600rr.net/vb/62-troubles.../topics/580697
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post #18 of 21 (permalink) Old 09-08-2018, 01:07 AM
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The cbr has electronic anti chatter. So when you roll off it coasts for a second before engine braking. If this is what you're describing it's normal.
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post #19 of 21 (permalink) Old 09-08-2018, 02:31 AM
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Quote:
Originally Posted by wibbly View Post
The cbr has electronic anti chatter. So when you roll off it coasts for a second before engine braking. If this is what you're describing it's normal.
That sounds funky. They introduced that "feature" in 07 yes?

2003 Honda CBR600RR
- Renthal Sprockets (15/45) - DID 520ERV3
- Micron Slip on - Pair/EVAP delete
- SS front brake lines - Gilles Rearsets
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post #20 of 21 (permalink) Old 09-08-2018, 10:51 AM
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Yes.......
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post #21 of 21 (permalink) Old 09-08-2018, 06:39 PM
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OP are you sure your throttle isn't sticking?

2003 Honda CBR600RR
- Renthal Sprockets (15/45) - DID 520ERV3
- Micron Slip on - Pair/EVAP delete
- SS front brake lines - Gilles Rearsets
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