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Old 11-03-2008, 11:20 AM   #1
Ulric
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troubleshooting performance problems...

Last week, replaced plugs & air-filter.. bike was popping a bit more
and acted like it was loading up, or having problems around 5krpm (would sound/feel 'rumbly'). Plugs looked like it may be a tad rich but not what I would 'think' bad, but then I'm not a mechanic.

Still had the problem, loaded up on 93 octane.. running higher RPM on off chance of carbon buildup or bad gas (hoping to flush it out). Seemed to work...
Now again though it doesn't 'feel' the rumble etc and seems willing to 'get up and go' there's still more popping on decel and I noticed the header on cycl 3 is more 'silver' than gold as compared to the other pipes.

Carbs were adjust about 7-7.5k miles ago
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Old 11-03-2008, 12:46 PM   #2
Ulric
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gr realized wrong forum... sorry, someone kill this one.
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Old 11-04-2008, 08:05 AM   #3
ZXALAN
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Its likely something with the carbs. Shoot the header pipes with an infrared heat temp gun and see if #3 is noticeably different in temp. Did the #3 plug look different from the others? It only takes one cylinder having an issue to cause a noise or running issue.

Has the bike been sitting or anything? Doesn't take much to plug a pilot jet. I see a carb job in your future probably....You could also have a vacuum leak on of the carbs which not only screws up the fuel mixture but can cause popping through the exhaust. Make sure your carb spigots are tight and not split anywhere.

Could be lots of stuff.
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Old 11-04-2008, 08:08 AM   #4
ZXALAN
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Also cylinders 2/3 usually do run hotter then 1/4 so I am not suprised by the different colored pipe at all. Sometimes tuners will stagger jet the carbs which means they run carbs 2/3 a little leaner as a hotter cylinder requires less fuel.
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