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unstable rpm at cruise

6083 Views 66 Replies 15 Participants Last post by  Strider
hey guys,

I traded my 08 r6 for 05 636 with 18k miles, about a month ago and took it out for long ride for the first time yesterday.

and on the way back home, I just realized, when I was at steady throttle,
my rpm was little bit rough, bouncy.. :O

if smooth rpm is descried as -----------------------------
my rpm was like ----_-------_----_--_------
and I could feel bike was little bit jerking, (I was at 9K rpm)

according to previous owner oil, spark plug, throttle cable has been all changed around 500miles ago.
Yoshi exhaust has been shortened by 3"
exhaust servo butterfly valve deleted
and he tuned it to run little bit rich.
but I don't think any of these should cause this problem.


any help to fix this problem would be great!!!
Thank you for your help in advance
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Hello and welcome!

Check that all of the vacuum lines and the hoses that go to the air box are properly attached and not leaking.
Welcome to the forum fella

Silly question but is it on an old tank of gas? that would be a possible cause as stupid as that sounds...run a fresh tank or two through before you "worry"
9000 rpms in what gear?

How much load?

How did he "tune it to be a bit rich" ? Is there a Power Commander or something on the bike? and where did he set it rich........If in fact it has a PC, I would bet that the guy had no clue what he was doing and the jetting is nowhere in the ballpark of accurate.

Do you know if the 15000 mile was ever even done? You know Valve adjustment, throttle body sync, TPS adjustment and all those critical adjustments as outlined in the service manual.

if they did not provide proof, then you should assume none of that was done and start there!
I will check vacuum hose tomorrow,

and I ran through 2 tanks of gas, pump 93 octane, my first choice of gas is shell.
9000 rpm at 6th gear,

and it has power commander don't know about tune info, I just know he used to track this bike,

don't know about 15000 miles service and he told me spark plug was done 500 miles ago, but im planning to redo plugs, oil, filter and all the basics again,
oh I have service manual,

why don't you tell me on what page I can find answer to this problem.

Thanks.
oh I have service manual,

why don't you tell me on what page I can find answer to this problem.

Thanks.
I hope you didn't mean it this way, but it kinda sounds like you're being a dick the way that's written. If that is, in fact, the effect you were going for, it's a pretty stupid approach to trying to get reliable information that could help you fix your bike...so, I'm going to assume that you're not actually stupid enough to do that and that I'm reading it wrong.

All that being said, I think at the very least, you probably should do the 15000 mile service since it almost definitely hasn't been done. There's a reason it's in the service manual (not sure of the page, but it's near the beginning and not hard to find...).

I can guarantee that if you do everything riverszzr says, you will have an excellently running bike. Could you get it running decently again without listening to him? Potentially, but you can't possibly go wrong by heeding his counsel.
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I hope you didn't mean it this way, but it kinda sounds like you're being a dick the way that's written. If that is, in fact, the effect you were going for, it's a pretty stupid approach to trying to get reliable information that could help you fix your bike...so, I'm going to assume that you're not actually stupid enough to do that and that I'm reading it wrong.

All that being said, I think at the very least, you probably should do the 15000 mile service since it almost definitely hasn't been done. There's a reason it's in the service manual (not sure of the page, but it's near the beginning and not hard to find...).

I can guarantee that if you do everything riverszzr says, you will have an excellently running bike. Could you get it running decently again without listening to him? Potentially, but you can't possibly go wrong by heeding his counsel.
I read his post the same way and thought..........Fuck you- get off your ass and look yourself.
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I hope you didn't mean it this way, but it kinda sounds like you're being a dick the way that's written. If that is, in fact, the effect you were going for, it's a pretty stupid approach to trying to get reliable information that could help you fix your bike...so, I'm going to assume that you're not actually stupid enough to do that and that I'm reading it wrong.

All that being said, I think at the very least, you probably should do the 15000 mile service since it almost definitely hasn't been done. There's a reason it's in the service manual (not sure of the page, but it's near the beginning and not hard to find...).

I can guarantee that if you do everything riverszzr says, you will have an excellently running bike. Could you get it running decently again without listening to him? Potentially, but you can't possibly go wrong by heeding his counsel.
not trying to be a dick, but I don't really appreciate people who respond with "look at service manual" "google that shit" etc etc

service manual is service manual, not a diagnostic tool.
it shows you how to maintain your bike and how to work on it, does not tell you what is causing problem x,y and z

if i could find answer for it from service manual or google I wouldnt be here, like you guessed, im not that stupid.

thanks for the all the inputs everyone
currently flushed everything, waiting on fiter, plugs and etc for basic maintenance,

I just hope its not valve.... :O
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Good job bud, report back with what you find.

Hint: there's an entire section on troubleshooting:devious
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Good job bud, report back with what you find.

Hint: there's an entire section on troubleshooting:devious
did not know about trouble shooting part,

just checked it out and I don't think service manual has answer for my problem sadly :bawling:

but I will update after i put my bike back together

thanks.
not trying to be a dick, but I don't really appreciate people who respond with "look at service manual" "google that shit" etc etc

service manual is service manual, not a diagnostic tool.
it shows you how to maintain your bike and how to work on it, does not tell you what is causing problem x,y and z

if i could find answer for it from service manual or google I wouldnt be here, like you guessed, im not that stupid.

thanks for the all the inputs everyone
currently flushed everything, waiting on fiter, plugs and etc for basic maintenance,

I just hope its not valve.... :O
Hints:

Honey catches more flies then sounding like a tool.

I use the find utility in my pdf reader of choice to get a page number in the FSM then assemble the pages in order I will need them in hard copy.

Usually answers like rtfm are given when there is not enough information present to tell which page in the fm. I get that it may be hard to find easily especially if you don't know the exact technical term... That's where not alienating the really smart people who seem to enjoy helping others comes in handy.

Good luck with your bike man!

Ey3
-Hook your bike up to your computer....usb to mini usb cable is needed
-download the Dyno jet software so you can pull the map file
-Post up the map in the bike in here, or PM it to me or somehow let me see what it has......highly likely it is fucked up
-And while you are at it, Either do it yourself correctly or have someone do it for you correctly.........the valve adjustment, throttle body sync and TPS adjustment as a bare bones minimum service

It clearly needs these things done

An entire chapter on routine maintenance and the schedule are found in the oe service manual

But this problem can stem from any number of issues the previous owner did to fuck it up........ That is a big reason to start somewhere, so you have real knowledge of the service history and what has been done, and what has not...

And lose your attitude about someone telling you to look at the manual because that shit won't fly with me and I will not help anyone too lazy to put in the effort to do something correctly. Or to appreciate the help garnered when people are nice enough to waste their valuable time helping others who know not what they are doing!
Consider this your only warning from- next time I simply will not help at all!
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Instead of slapping him in the face with a repair manual, and rolling with a cocky attitude, go fap to yourself in the mirror and beat your wife/dog then come back here and try to help out.

OP, does this happen when you're at part throttle and in any gear? I'd take the Power Commander out of the equation for now and see how the bike runs without it. If it's better without the PC 3 or 5, go back to your tuner, or find another one, see if the problem lies in a poor fuel map, if not then get rid of the Power Commander. If the problem exists even with the commander removed, I'd be checking for other mechanical/fuel air spark related issues. I had a similar problem with a PC5 and had to get it replaced under warranty. Good luck.
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Going to split this into two sections to respond...

Wtf is up with the douche **** here. Instead of slapping him in the face with a repair manual, and rolling with a cocky attitude, go fap to yourself in the mirror and beat your wife/dog then come back here and try to help out.
If you want to call someone out for being a "douche ***" (don't appreciate the slur btw), at least have the stones to do it by name. If you think I've said something out of line, quote my post and call me out on it; don't just make a general statement about the people responding in this thread.

Secondly, as for attitude, it seemed to me like OP brought a little attitude in himself when he asked a page number from the manual. As previously stated, I assume he wasn't being as much of a dick as it kind of sounded like (and I honestly mean that I'm assuming that he didn't really mean it that way), but I have to believe at least a little attitude was intended there. I hope I wasn't too much of a jerk in my response, but that seems like a pretty dangerous thing to do as a member with a grand total of 3 posts under his belt all asking for help, no introduction, etc.

Ok...moving on:

OP, does this happen when you're at part throttle and in any gear? I'd take the Power Commander out of the equation for now and see how the bike runs without it. If it's better without the PC 3 or 5, go back to your tuner, or find another one, see if the problem lies in a poor fuel map, if not then get rid of the Power Commander. If the problem exists even with the commander removed, I'd be checking for other mechanical/fuel air spark related issues. I had a similar problem with a PC5 and had to get it replaced under warranty. Good luck.
OP, I think this is a good plan. Simply starting by removing the PC is an easy way to see if that's causing the problems. I still think you should do the service suggested with the 15000 mile, but you indicated that you may do some of that, so I won't keep harping on it.

Pull the PC, and go for a ride. If it's still having the issue you described, well, then we continue helping you diagnose. If it's not, then you probably just need a better map on your PC.
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Let me guess, you've been tossing homophobic slurs around without thought for quite some time now. So much so that you just sling them around anywhere, especially in public forums without any regard, and now they're just second nature. Hopefully you don't pass that disrespect/hate onto future generations. However, there is still time for you to change your hateful ways and turn this little mishap into something positive.
Agreed derogatory slurs should be kept to yourself or in the company of others who enjoy that sorta thing. You never know who is gay , black , white , ect , ect. Unless they ride a Suzuki then they are just plain silly..lol
I would remove PC and see how it runs...
but seems like the OEM wiring is not there so I don't think removing PC isn't option for me atm ....

im started to think this isn't OEM wiring... I noticed location of rear brake switch connector is little off

I will check current map and post it here tonight.
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