KZ1100 pinging

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06 May 2016 21:22 #725007 by 76KZ900
KZ1100 pinging was created by 76KZ900
Noticed pinging .. detonation under hard acceleration. I use 93 octane and its helped but hasnt got rid of it. Ive checked timing its spot on. Even the advance mechanism is working right. Bike has average compression psi with what im assuming is factory pistons.. Bike does have a dyna s ignition. Anyone else run into this and what did you do to correct it ? Thanks
78KZ400 (sold)
78KZ1000 (sold)
82KZ1100 (sold)
76KZ900 (sold) regret
03ZRX1200R (sold) regret
83KZ1100 LTD Shaft

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06 May 2016 21:25 #725008 by missionkz
Replied by missionkz on topic KZ1100 pinging
Sounds more like preignition to me.
Could be bad plugs but most likely carbon build up in the combustion chamber, valve heads or piston domes.
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado

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06 May 2016 23:24 #725018 by daveo
Replied by daveo on topic KZ1100 pinging
I wonder if the gasoline brand has anything to do with it. My bike started running odd just after putting different gas in yesterday, and I noticed subtle pre ignition a couple times when pulling away from stops today. :pinch:
1982 KZ1100-A2

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  • SWest
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  • Sustaining Member
  • 10 22 2014
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07 May 2016 05:35 #725026 by SWest
Replied by SWest on topic KZ1100 pinging
Pics of plugs? Valves adjusted?
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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07 May 2016 16:48 #725093 by VTEC
Replied by VTEC on topic KZ1100 pinging
My worn KZ engine had a spark knock from carbon build up. I quieted it down temporarily (and periodically) with top engine cleaner. Tune-up in a can.
KZ1000-K2
ZRX1100
XR400R

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08 May 2016 04:44 #725157 by car5car
Replied by car5car on topic KZ1100 pinging
Go to GM dealer and buy valve cleaning fluid.
96 Yamaha Royal Star
82 Yamaha Virago 920

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  • SWest
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  • Sustaining Member
  • 10 22 2014
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08 May 2016 07:34 #725174 by SWest
Replied by SWest on topic KZ1100 pinging
Additives can and will harden rubber seals. There is no substitute for replacing them and using the right type of oil. If they are leaking, there is a reason for it.
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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  • Nessism
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08 May 2016 08:49 #725180 by Nessism
Replied by Nessism on topic KZ1100 pinging
Chevron Techron in a can is reputed to be good stuff. It wouldn't hurt to run some through the engine on the next few tanks (until the can is gone). You also might want to retard the ignition a little. With a Dyna S you may have the ignition advanced a little unless you checked it with a timing light at full advance (engine running).
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0

www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

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08 May 2016 10:02 #725189 by 76KZ900
Replied by 76KZ900 on topic KZ1100 pinging
Timing checked at full advance.. its perfect.. Carbon build up likely makes most sense. Thanks Ill go the sea foam route.
78KZ400 (sold)
78KZ1000 (sold)
82KZ1100 (sold)
76KZ900 (sold) regret
03ZRX1200R (sold) regret
83KZ1100 LTD Shaft

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08 May 2016 12:09 - 08 May 2016 12:10 #725205 by missionkz
Replied by missionkz on topic KZ1100 pinging
I've never had much luck with any of those products when it comes to combustion chamber cleaning of an assembled and running engine.
I think a good and hot engine with cold water and rubbing alcohol mix sprayed in the open carbs, at medium low throttle might be just as good.
I found some combustion chamber cleaning fluid from Chrysler that worked well with the head off!! Nice stuff but messy.
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
Last edit: 08 May 2016 12:10 by missionkz.

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08 May 2016 12:27 #725207 by KZB2 650
Replied by KZB2 650 on topic KZ1100 pinging
I've read good things about Gumout Regane mixed in the gas...... maybe that and the water spray trick too.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.

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