Did you tighten the boots from the airbox to the throttle bodies properly? Is the AIS tube to the airbox secure? Are the vent tubes to the gas tank mixed up? Is the connector to the fuel pump tight?
Help! bike has a sputter. running out of ideas!
good afternoon people. so, i have a problem- my bike has a sputter/miss when maintaining speed. its not noticeable when accelerating but can really be felt when staying at a steady speed and sometimes sounds rough when idling. I have checked all the electrical connections i could see/get to including on the power commander, i checked to make sure all the vacuum lines were in place and not cracked, i put some fuel injector cleaner in the gas and tried running it, and i replaced the spark plugs thinking that might help, i also checked the spark plug coils. the coils were in spec when cold (i read the primary resistance should be between 1.19-1.61 ohms, please correct me if im wrong. couldnt find specs for the secondary resistance). i read that they can give different readings when hot so i put them back in the bike and ran it then tested them again. those readings were out of spec but consistent (cylinder 1- prim:2.0 second:12.42, cylinder 2- prim:2.0 second:12.41 cylinder 3- prim:2.2 second:12.61). i have a hard time believing all 3 would fail but i really dont know. any help or other things i could check would be appreciated.
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yes sir. everything is tight. all tubes are pushed all the way on and the clips securing them are in place. all electrical connections click into place solidly.
Is the bike stock, or flashed or aftermarket exhaust or both? Did you change anything just before the problem appeared?
Rough idling is a symptom of out of sync throttle bodies. How many KM since this was done last?
The bike has had a power commander 5 on it for quite some time before the problem. The exhaust is new. I thought it could have something to do with the back preasure so I tried adding fiberglass packing to the baffle in different amounts to see if that had an effect and it didn't change anything. The bike recently had the ECU reflashed but the sputter was happening before that and didn't have any effect on the sputtering. Thanks for the help.
I have never synced the throttle bodies. I'll have to learn how to do that. Thanks for the help. I really appreciate it.Rough idling is a symptom of out of sync throttle bodies. How many KM since this was done last?
Get the AFR checked, your new exhaust could have changed it. Possibly leaned out at light load.
I thought it could have been that. I have a power commander and have tried a few different tunes (it's a homemade exhaust system so I don't have an exact match) and no matter what tune I try the problem stays the same.Get the AFR checked, your new exhaust could have changed it. Possibly leaned out at light load.
I thought it could have been that. I have a power commander and have tried a few different tunes (it's a homemade exhaust system so I don't have an exact match) and no matter what tune I try the problem stays the same.
I would recommend taking the power commander off, best way to check if its your bike or the power commander (even though it does take time to take it apart). From there it makes it easier to see what's causing the problems.
Good thinking. I've tried everything else. I'll give that a shot tomorrow and see how it does.I would recommend taking the power commander off, best way to check if its your bike or the power commander (even though it does take time to take it apart). From there it makes it easier to see what's causing the problems.
hopefully this video works. its the best audio i could get of the sputtering im dealing with. so far ive put fresh plugs in the bike, tested the spark plug coils for resistance, i cranked the engine with the plugs pulled out to make sure they were sparking (they all are) tested the fuel injectors for resistance and ran them spraying into a bucket (they all sprayed fine), i've tried different tunes on the power commander and it caused no change at all to the sputtering, all electrical connections, vacuum lines, and tubes are solidly in place. ive tried adding additional fiberglass packing to the muffler thinking it might be a back pressure problem with my homemade exhaust but that also had no effect. im going to try removing the power commander just to rule that out completely and i'd like to find a way to test for compression. other than that, im out of ideas.
i dont want to cause any damage to the bike so i havent been taking it out much since this started. any advice or ideas would be greatly appreciated.
i dont want to cause any damage to the bike so i havent been taking it out much since this started. any advice or ideas would be greatly appreciated.
Running too lean perhaps?
It could be but I doubt it. 2wheeldynoworks said the exhaust was most similar to the M4 pipe and reflashed the ECU to match that. The power commander was also running the M4 tune but I tried a few others including the arrow exhaust with the baffle removed. I figured that tune would make it run rich but it changed nothing.Running too lean perhaps?
It's hard to tell by sound, but it does sound like leaness. Does the bike surge when this is happening? I'd stiil get the AFR checked at light load.
I haven't felt any surging. Any idea how I can test the AFR while it's under a load? Thanks for the help.It's hard to tell by sound, but it does sound like leaness. Does the bike surge when this is happening? I'd stiil get the AFR checked at light load.
Dyno, or mobile AFR read out. I'd have thought there'd be some surging if it was overly lean. When you say it's missing, do you feel the engine miss a beat, stutter and then clear, anything like that?
did you do a compression tests on each cylinder? It could ne that maybe you have a bad/ sticking/seating isues with a valve like seen on another post on here (just not as bad). Just an idea.
Around what RPM does it start to sputter? Are you still using the O2 sensor, or was it removed? The reason I ask, the O2 sensor feeds the closed-loop fuel map (which your PowerCommander can't tune). The bike switches between these two maps at 5K to 6K RPM.
Here's the whole scoop about how the system works: http://www.fz09.org/forum/14-fz-09-performance-suspension/5803-02-controller.html
Here's the whole scoop about how the system works: http://www.fz09.org/forum/14-fz-09-performance-suspension/5803-02-controller.html
I feel the sputter when maintaining speed between about 3000-4500rpm. I removed the baffle from my muffler, wrapped it with some fiber glass packing for some added back preasure and made the power commanders tune a bit richer in that range. It feels a but better but it's still there. I'm planning to take the bike out later today for a decent ride (been raining for weeks here) and get a better idea of how it's running.
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