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Fire coming out of carbs

  • Cfoux85
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  • 1982 Kawasaki kz 750e
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28 Apr 2022 12:48 - 28 Apr 2022 12:50 #866295 by Cfoux85
Fire coming out of carbs was created by Cfoux85
I have a 1982 Kawasaki kz750e with kehien carbs cheapish pod filters, and the carbs keeps shooting fire out catching my pod filters on fire. I've rejetted the carbs with the sigma6 jet kit and I don't know what it is. Can anyone please help me before I blow myself up
Last edit: 28 Apr 2022 12:50 by Cfoux85.

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28 Apr 2022 13:08 #866299 by ghostdive
Replied by ghostdive on topic Fire coming out of carbs
Hmm...maybe your ignition timing is too advanced?

1982 KZ750 Spectre - 6 speed swap, BS34s, 18" rear wheel

2001 ZX-6R

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28 Apr 2022 13:11 #866300 by Mikaw
Replied by Mikaw on topic Fire coming out of carbs
Timing yes. Could be the advancer is stuck advanced. Could be a leaky valve and also the float stuck in the carbs flowing excess fuel. How many cylinders are affected?

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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28 Apr 2022 13:11 - 28 Apr 2022 13:12 #866301 by Warren3200gt
Replied by Warren3200gt on topic Fire coming out of carbs
Mixture too lean causes back firing through the carbs. 
What colour are your spark plugs. 


Z1000J2 somewhat modified!

Last edit: 28 Apr 2022 13:12 by Warren3200gt.

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28 Apr 2022 14:33 - 28 Apr 2022 14:35 #866307 by JR
Replied by JR on topic Fire coming out of carbs
Great looking bike.

I experienced spit back through the carbs noticeable at low speed and at idle when my carb boots cracked. Nothing to the extent of flames though. Replacement fixed the problem. Easy to check. I had K&N pods at the time (recommend ditching the cheap pods) and I think the unsupported carbs may have helped cause the cracking. I since have gone to an airbox

I would also suggest checking for missing carb vacuum caps

 

1980 kz750E1, Delkevic exhaust
Last edit: 28 Apr 2022 14:35 by JR.
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  • Cfoux85
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  • 1982 Kawasaki kz 750e
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28 Apr 2022 15:26 #866309 by Cfoux85
Replied by Cfoux85 on topic Fire coming out of carbs
It seems like it's the two inner carbs

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  • Cfoux85
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  • 1982 Kawasaki kz 750e
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28 Apr 2022 15:29 #866310 by Cfoux85
Replied by Cfoux85 on topic Fire coming out of carbs
Thank you, the floats aren't stuck, I will inspect the carb boots for cracks. It only has 9700miles on it. I wish I could find a original airbox that is affordable.

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  • Cfoux85
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28 Apr 2022 15:30 #866311 by Cfoux85
Replied by Cfoux85 on topic Fire coming out of carbs
They look a brownish color

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  • Cfoux85
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28 Apr 2022 15:34 #866313 by Cfoux85
Replied by Cfoux85 on topic Fire coming out of carbs
I'm thinking about selling it since it's giving me so much trouble, or trading it 

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  • Street Fighter LTD
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  • TURBO, Its Better to be Blown than Injected
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28 Apr 2022 17:22 #866316 by Street Fighter LTD
Replied by Street Fighter LTD on topic Fire coming out of carbs
Cam or spark timing      NOT hard to check

Dave


Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
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  • Ojisan rider
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28 Apr 2022 21:46 #866334 by Ojisan rider
Replied by Ojisan rider on topic Fire coming out of carbs
I only have experience with V-8 motor, but I believe it was timing that was too retarded that had fire coming out from my carb. I had the distributor so off that engine wouldn't start but fire/flame was coming out from the carb.

Did this happened before the Keihin carb? It looks like CVK carb. Did you get the correct manifold/insulator?

Mind you, these bikes are not plug and play bikes. You always have to tweak it somewhat to make it work.

82' KZ750-R1 cafe racer style. Clip-on, Rear set, Fork-Brace, Mikuni Flat-slide (forgot the size), Kerker.
84' GPz750 (basket case). everything are in pieces.
89' ZX750-H1 (ZX-7 Ninja). Resurrection project are on going with my KZ750. Everything is stock.

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  • Street Fighter LTD
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29 Apr 2022 04:31 #866348 by Street Fighter LTD
Replied by Street Fighter LTD on topic Fire coming out of carbs
Maybe plug wires crossed up too


Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn

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