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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 04-01-2010, 08:44 PM   #1
numnutz89
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Default 91 katana idle problem, possible causes?

i own a 91 kat 600, it will run at first but once it is warmed up it will backfire and die. if you keep it above 1000 or so rpms it will run but if u let off at all it will backfire and stall again. im pretty sure that the 1st and 2nd cylinders arent firing because the header pipe is only warm for those two but the others are hot enough you cant touch them.
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Old 04-01-2010, 08:47 PM   #2
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i own a 91 kat 600, it will run at first but once it is warmed up it will backfire and die. if you keep it above 1000 or so rpms it will run but if u let off at all it will backfire and stall again. im pretty sure that the 1st and 2nd cylinders arent firing because the header pipe is only warm for those two but the others are hot enough you cant touch them.
I would guess your carbs need cleaned from the little info provided.

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Old 04-01-2010, 09:01 PM   #3
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thanks, my dad was saying he thought it could be the one of the coils. but doesnt one coil do cylinder 1 and 3 and the other does 2 and 4? i just got the bike. The previous owner put vance and hines exhaust on it. all 4 of the plugs were black on it when i pulled them out, and i had spark at all 4. they were so fouled that they were firing way down inside the porcelin so i replaced them.
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Old 04-01-2010, 09:04 PM   #4
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thanks, my dad was saying he thought it could be the one of the coils. but doesnt one coil do cylinder 1 and 3 and the other does 2 and 4? i just got the bike. The previous owner put vance and hines exhaust on it. all 4 of the plugs were black on it when i pulled them out, and i had spark at all 4. they were so fouled that they were firing way down inside the porcelin so i replaced them.
Yeah, I doubt it's a coil issue... on these bikes, its much more common to be a dirty or improperly adjusted carb.

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Old 04-01-2010, 09:06 PM   #5
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ok thank you, it also had old gas in it. going to change that out tomorrow also
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