KZ1100 pinging

76KZ900
Topic Author
Offline
User
Registered
Posts: 238
Thanks: 5

KZ1100 pinging

06 May 2016 21:22

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

Please Log in or Create an account to join the conversation.

missionkz
Offline
Sustaining Member
Registered
Posts: 1612
Thanks: 182

Re: KZ1100 pinging

06 May 2016 21:25

#725008

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

Please Log in or Create an account to join the conversation.

daveo
Offline
Premium Member
Registered
Posts: 3175
Thanks: 899

Re: KZ1100 pinging

06 May 2016 23:24

#725018

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-A2/1170 sleeper 😀

Please Log in or Create an account to join the conversation.

SWest
Offline
Sustaining Member
Registered
10 22 2014
Posts: 23779
Thanks: 3045

Re: KZ1100 pinging

07 May 2016 05:35

#725026

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

Please Log in or Create an account to join the conversation.

VTEC
Offline
User
Registered
Posts: 558
Thanks: 80

Re: KZ1100 pinging

07 May 2016 16:48

#725093

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

Please Log in or Create an account to join the conversation.

car5car
Offline
Banned
Registered
Posts: 534
Thanks: 20

Re: KZ1100 pinging

08 May 2016 04:44

#725157

Go to GM dealer and buy valve cleaning fluid.

96 Yamaha Royal Star
82 Yamaha Virago 920

Please Log in or Create an account to join the conversation.

SWest
Offline
Sustaining Member
Registered
10 22 2014
Posts: 23779
Thanks: 3045

Re: KZ1100 pinging

08 May 2016 07:34

#725174

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

Please Log in or Create an account to join the conversation.

Nessism
Offline
Sustaining Member
Registered
Posts: 8205
Thanks: 3577

Re: KZ1100 pinging

08 May 2016 08:49

#725180

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/14-vendor-forum/62...rburetor-o-ring-kits

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

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

Please Log in or Create an account to join the conversation.

76KZ900
Topic Author
Offline
User
Registered
Posts: 238
Thanks: 5

Re: KZ1100 pinging

08 May 2016 10:02

#725189

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

Please Log in or Create an account to join the conversation.

missionkz
Offline
Sustaining Member
Registered
Posts: 1612
Thanks: 182

Re: KZ1100 pinging

08 May 2016 12:09 - 08 May 2016 12:10

#725205

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.

Please Log in or Create an account to join the conversation.

KZB2 650
Offline
User
Registered
Posts: 1472
Thanks: 264

Re: KZ1100 pinging

08 May 2016 12:27

#725207

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.

Please Log in or Create an account to join the conversation.