Piston kissed the sparkplug

More
27 Jun 2020 05:00 #829071 by Quigleyje
Piston kissed the sparkplug was created by Quigleyje
I was out riding zx550 yesterday missed second bike revved and the piston hit the spark plug. Is this a rebuild now? Can I put a new plug in and ride it?
81/84 kz/zx550

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

More
27 Jun 2020 05:14 #829072 by Nessism
Replied by Nessism on topic Piston kissed the sparkplug
You got nothing to loose in trying. Very strange for that to happen though. Either the rod stretched or you have bearing wear/damage. It's far more common for the valves to hit the pistons resulting in them being bent in that situation.
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
The following user(s) said Thank You: Quigleyje

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

More
27 Jun 2020 05:20 #829074 by Quigleyje
Replied by Quigleyje on topic Piston kissed the sparkplug
Maybe it was a valve not sure just know the plug is flat. Maybe it's just time for a rebuild.
81/84 kz/zx550

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

  • bluej58
  • Offline
  • Sustaining Member
  • The chrome don't get you home
More
27 Jun 2020 06:29 #829076 by bluej58
Replied by bluej58 on topic Piston kissed the sparkplug
Are they stock plugs?
78 KZ1000 A2A

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

More
27 Jun 2020 06:51 #829077 by Quigleyje
Replied by Quigleyje on topic Piston kissed the sparkplug
Yeah they are the stock plugs
81/84 kz/zx550

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

More
27 Jun 2020 07:28 #829082 by ckahleer
Replied by ckahleer on topic Piston kissed the sparkplug
It's hard to believe bearings could be that bad and not making an awful knock. Check compression. Look through the plug hole at the piston half way up. Can you see damage? Turn engine a little CW then CCW. Is there slop in piston movement.If not,put in a new plug and and rev it again.
94 KE100
81 CM200t
82 KZ305
85 VF1100c
The following user(s) said Thank You: Quigleyje

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

More
27 Jun 2020 07:38 #829083 by Quigleyje
Replied by Quigleyje on topic Piston kissed the sparkplug
Yeah there was no noise at all always ran smooth. But it revved past redline. I accelerated pretty hard before missing second. I imagine something is damaged the plug was hit hard.
81/84 kz/zx550

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

More
27 Jun 2020 07:42 #829084 by 650ed
Replied by 650ed on topic Piston kissed the sparkplug
Did the spark plug have the washer on it? Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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

More
27 Jun 2020 07:45 #829085 by Quigleyje
Replied by Quigleyje on topic Piston kissed the sparkplug
Yes the washer was on. Maybe over tightened not sure.
81/84 kz/zx550

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

More
27 Jun 2020 08:31 #829089 by Quigleyje
Replied by Quigleyje on topic Piston kissed the sparkplug
So I looked in all cylinders #4 is the only one with damaged spark plug. The valve I can see seems to have no damage. No metal picked up with a magnet. Put new plug and I'm getting backfire through that carb. I can only guess bent valve. It still revs fine and no noticable noise.( But it was only for a couple seconds).
81/84 kz/zx550

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

Powered by Kunena Forum

Forum Links