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Mechanics 101 Can't get it to run right? Find a trick to add HP?
From the first oil change to completely rebuilding the engine,
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Old 12-08-2017, 03:35 PM   #1
Tank Slapper
Join Date: Aug 2013
Location: Sidney BC Canada
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Default misfiring at idle and low rpm

I have had a misfire problem for some time now, I recently put in new plugs and checked them after running for some time and #3 was black, the others didnt really have any color yet. I have been through these carbs quite a few times. I thought maybe i had a leaky float valve in #3 so I took it apart and couldnt see anything wrong, but I cleaned it anyway and put it back together.
Besides a leaky float I dont know what would make one cylinder run that much richer than the other 3?
1989 GSXF 750 Katana.
V&H supersport exhaust, ported head, GSXR cams
Michelin PR2's, RT fork springs and R6 shock
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Old 12-08-2017, 06:20 PM   #2
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Location: Oakland, CA
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Weak spark. How are the plug wires looking? Might want to check for arching
1998 Katana 750
1992 Katana 1100
2006 Ninja 250

2006 Katana 600 RIP - 130k miles
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Old 12-08-2017, 10:01 PM   #3
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Or #3 running very rich
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