#4 cylinder not firing

  • grandadbob
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Re: #4 cylinder not firing

17 Sep 2009 04:55
#322135
I've tried all combinations of plugs etc without any change. Tried checking the IC igniter resistances but not very successful. Pulled carbs again and have found a blocked pilot jet drilling. Can't clear it with aerosol cleaner so I'll take it to garage for compressed air blast tomorrow.
I'll keep posting and keep smiling.
'83 KZ550 C4 LTD
'06 VFR800 Vtec

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  • wes_scooter
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Re: #4 cylinder not firing

17 Sep 2009 05:01
#322138
good to hear you found something. if you dont have inline filters you might want some. also treating the gas with aditive will help prevent that when it must sit. gas just isent what it should be...also sea-foam is suposed to help clean passages that might be working but are still gumed up.
76' kz900
70' yamaha R5
2006 wr450f

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Re: #4 cylinder not firing

17 Sep 2009 11:14
#322209
Thanks for info on sea-foam.....I'm keeping my fingers crossed re the blockage.
'83 KZ550 C4 LTD
'06 VFR800 Vtec

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Re: #4 cylinder not firing

18 Sep 2009 03:06
#322331
Bad news.....air line couldn't clear the blockage in the pilot circuit.....good news is there is definitely a blockage.
Anyone got any idea how to clear the circuit.
'83 KZ550 C4 LTD
'06 VFR800 Vtec

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  • ArthurGoVroom
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Re: #4 cylinder not firing

18 Sep 2009 04:29
#322338
You can use one of the wires from a fine wire brush to stab through it. Yes they say don't use wires to clean them...but IMO it's better to be slightly reamed out than totally clogged.
1976 KZ900A4, 4-1 header, rear lowering kit, grab bar removed, still shining and painting parts as time permits

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Re: #4 cylinder not firing

18 Sep 2009 18:49
#322435
if the blockage is really bad i'll use tip cleaners from a cutting torch they always work well for me or i'll also use small number drills they always work.
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  • grandadbob
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Re: #4 cylinder not firing

18 Sep 2009 23:48
#322467
Only problem is trying to clear round corners in the body. I'm taking the carbs to be ultrasonically cleaned today. See if that works!!!!!!
'83 KZ550 C4 LTD
'06 VFR800 Vtec

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  • wes_scooter
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Re: #4 cylinder not firing

19 Sep 2009 06:05
#322478
that should work, i've seen that take some very nasty carbs to a very good condition inside and out. i have a gallon of carb solution that i usuly let them soak in. works very good.
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Re: #4 cylinder not firing

23 Sep 2009 14:55
#323538
Got the carbs back....still #4 pilot jet circuit blocked. Back to the manual where I see the US model has a sealed air screw to comply with your emission laws. I removed the seal and the air screw and managed to clear the blockage. I'll try the carbs on the bike again.
'83 KZ550 C4 LTD
'06 VFR800 Vtec

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Re: #4 cylinder not firing

24 Sep 2009 12:04
#323678
Good news...firing on all four...bit rough but i'm sure she'll respond to a bit of tlc.
Big thanks to all of you out there...surely we share the best site on the net.
'83 KZ550 C4 LTD
'06 VFR800 Vtec

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  • MFolks
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Re: #4 cylinder not firing

24 Sep 2009 15:34
#323700
I find the welding tip cleaners sold at the welding supply stores to have the best small diameter wires for pushing out blockages. Here in the U.S. they sell for under $5.

Guitar strings and small diameter safety wire might work too.
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