wnaplay1647545503 Posted October 28, 2007 Report Share Posted October 28, 2007 I have a 98 cbr 900rr bike and it recently started running rough about 1/2 way through my 20 min ride to work. It has done this several times now. I replaced the plugs last night hoping to fix the problem, but it did it again this morning and on the way home. It starts out just fine, however around 10mins of riding, it feels short on power, sputtering through the exhaust and just running rough. It definately sounds rough however it does feel like it still has decent power when I hit it. Any suggestions? More history, I bought the bike this year wrecked. Repaired it and rode it without any issue until now. Quote Link to comment Share on other sites More sharing options...
31rx7 Posted October 28, 2007 Report Share Posted October 28, 2007 If the plugs looked to be in reasonable shape, I would suspect a fuel system issue. Does the issue seem isolated to one cylinder or across cylinders? Also, since it starts out fine and then starts to happen after warmup, could the choke system be malfunctioning? Just thoughts. I am by no means an expert on bikes. However, having an older bike like mine means that these types of things happen and I have to learn by doing! Quote Link to comment Share on other sites More sharing options...
88lx5oh Posted October 29, 2007 Report Share Posted October 29, 2007 i would assume carb problems. maybe choke related Quote Link to comment Share on other sites More sharing options...
wnaplay1647545503 Posted October 29, 2007 Author Report Share Posted October 29, 2007 We have a ultrasonic carb cleaning machine at work. I will try to figure out how much I have to tear them apart and give them all a good cleaning. Anyone know of temporary fix until it gets colder out and I put it away for the winter? Quote Link to comment Share on other sites More sharing options...
88lx5oh Posted October 29, 2007 Report Share Posted October 29, 2007 at what throttle position is it running rough.. idle idle - 1/4 1/4 - 1/2 1/2 - wot its easier to diagnose if i now that Quote Link to comment Share on other sites More sharing options...
Guest GMoney Posted October 29, 2007 Report Share Posted October 29, 2007 I would check the ignition system before you mess with the carbs. I have seen also of cars where it runs great until the coil or coils heat up then start to break up. Heat is the second largest killer of electronic behind dirty power. Quote Link to comment Share on other sites More sharing options...
wnaplay1647545503 Posted October 29, 2007 Author Report Share Posted October 29, 2007 I would check the ignition system before you mess with the carbs. I have seen also of cars where it runs great until the coil or coils heat up then start to break up. Heat is the second largest killer of electronic behind dirty power. What exactly are you suggesting I look at? Quote Link to comment Share on other sites More sharing options...
Farkas Posted October 29, 2007 Report Share Posted October 29, 2007 If it's carbed, I would suggest having them tuned.. weather changes have a small effect on carbs. Getting them cleaned wouldn't be a bad idea either. Quote Link to comment Share on other sites More sharing options...
Akula Posted October 29, 2007 Report Share Posted October 29, 2007 pull your plug caps, check the wire running into the caps, my bike used to do this and it was corrosion between the plug wire and the cap. Quote Link to comment Share on other sites More sharing options...
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