Welcome, Guest
Username: Password: Remember me

TOPIC:

Somebody Blew It 08 Dec 2023 12:44 #892470

  • daveo
  • daveo's Avatar Topic Author
  • Offline
  • Premium Member
  • Posts: 2764
  • Thank you received: 630
...a long time ago, I'm guessing.
 



Acquired an 84 ZN1100 motor and I have a few questions.
This seems like a good place to start.



Not sure I like this Kawasaki 11004-1104 gasket, though I've had good luck with the fiber type.

What could have caused such a failure?





The head is flat

1982 KZ1100-A2

Attachments:

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

Last edit: by daveo.

Somebody Blew It 09 Dec 2023 19:17 #892496

  • daveo
  • daveo's Avatar Topic Author
  • Offline
  • Premium Member
  • Posts: 2764
  • Thank you received: 630
Ok then, here's another question...

What purpose do the vertical factory-cut openings between cylinders and the cam chain tunnel serve, as shown in the cylinder block image below?

1982 KZ1100-A2

Attachments:

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

Somebody Blew It 09 Dec 2023 19:32 #892498

  • SWest
  • SWest's Avatar
  • Offline
  • Sustaining Member
  • 10 22 2014
  • Posts: 22388
  • Thank you received: 2609
Looks like it wasn't torqued properly then retorqued too much.  
The vents help cooling the barrels. 
The big bore kits don't have them so overheating becomes a problem on a street bike. 
Steve
The following user(s) said Thank You: daveo

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

Somebody Blew It 09 Dec 2023 20:01 #892500

  • daveo
  • daveo's Avatar Topic Author
  • Offline
  • Premium Member
  • Posts: 2764
  • Thank you received: 630
Thanks Steve.

That pic is of a cylinder block I have saved for some as-yet unknown purpose.

My new/old, potentially useless ZN1100 cylinder block has several un-cut vents, which likely contributed to the head gasket's demise directly above.





I'd like to salvage this block, but it may only be good to have bored for oversize pistons.  It looks to have sat for some time...

1982 KZ1100-A2

Attachments:
The following user(s) said Thank You: SWest, Rolf1976_KZ900

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

Last edit: by daveo.

Somebody Blew It 09 Dec 2023 21:34 #892501

  • SWest
  • SWest's Avatar
  • Offline
  • Sustaining Member
  • 10 22 2014
  • Posts: 22388
  • Thank you received: 2609
You can drill out the blocked vents then file them smooth. When I had the Z2 750 block bored to 1015 you could still see rust stains from when the block sat out in the weather. That tells you how porous the steel is but I ran it anyway. When I opened it up the sleeves were polished smooth so I installed new Wiseco pistons and RODE THE PISS OUT OF IT in 2014. Had an oiling problem in 15 so I got a low mile 1015 block and ran it. 
I'd keep the block and maybe take it out to the limit or just keep as a spare. I like spares. 
Steve
The following user(s) said Thank You: Rolf1976_KZ900

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

Somebody Blew It 09 Dec 2023 23:16 #892502

  • daveo
  • daveo's Avatar Topic Author
  • Offline
  • Premium Member
  • Posts: 2764
  • Thank you received: 630

You can drill out the blocked vents then file them smooth. When I had the Z2 750 block bored to 1015 you could still see rust stains from when the block sat out in the weather. That tells you how porous the steel is but I ran it anyway. When I opened it up the sleeves were polished smooth so I installed new Wiseco pistons and RODE THE PISS OUT OF IT in 2014. Had an oiling problem in 15 so I got a low mile 1015 block and ran it. 
I'd keep the block and maybe take it out to the limit or just keep as a spare. I like spares. 
Steve
 
If those unopened vent spots were responsible for the great blow-out in this old-beautiful ungine, seems the manufacturer may have been technically irresponsible to some form of degree, IMO.  
                                          

Great suggestion to drill them buggers out. 

I have so many spares, my trunk is full.  I hate to sell my house for having to move them.  I know the general location of every one, if you know what I mean.
1982 KZ1100-A2

The following user(s) said Thank You: SWest, Rolf1976_KZ900

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

Somebody Blew It 10 Dec 2023 02:23 #892504

  • Rolf1976_KZ900
  • Rolf1976_KZ900's Avatar
  • Offline
  • User
  • Posts: 239
  • Thank you received: 108
Hi i am not sure why the head gasket blew ,but guessing to high compression and overheating on 2 and 3.About the cylinder holes that is clogged or not bored.On my 900 i had to use a metal pick and dig out a lot of gravel and dirt that was burned to a rock hard mass clogging the cooling holes.
i post a pick of that. Now for the sleeves that looks to be same problem that i had .Engine may have standing  unused for a long time with
water in cylinder.When i bought new sleeves for my kz900 about 1 moth ago they turned out to bee way to big as zed1015 told me.Anyway i think they might fit your 1100.
I can sell them to you for 20 usd each plus shipping form Norway if you want them.In the pic i hold a 1200cc piston and it is a little too big for the sleeve. You can see the measurements on the sleeves and compare if they are the same as yours.or maybe zed1015 know if they fit.I can take more measurements of them if you want.

Attachments:

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

Last edit: by Rolf1976_KZ900.

Somebody Blew It 10 Dec 2023 04:32 #892505

  • slmjim+Z1BEBE
  • slmjim+Z1BEBE's Avatar
  • Offline
  • User
  • Enjoy Life! IT HAS AN EXPIRATION DATE!
  • Posts: 1112
  • Thank you received: 588

Hi i am not sure why the head gasket blew ,but guessing to high compression and overheating on 2 and 3.About the cylinder holes that is clogged or not bored.On my 900 i had to use a metal pick and dig out a lot of gravel and dirt that was burned to a rock hard mass clogging the cooling holes.
i post a pick of that. Now for the sleeves that looks to be same problem that i had .Engine may have standing  unused for a long time with
water in cylinder.When i bought new sleeves for my kz900 about 1 moth ago they turned out to bee way to big as zed1015 told me.Anyway i think they might fit your 1100.
I can sell them to you for 20 usd each plus shipping form Norway if you want them.In the pic i hold a 1200cc piston and it is a little too big for the sleeve. You can see the measurements on the sleeves and compare if they are the same as yours.or maybe zed1015 know if they fit.I can take more measurements of them if you want.


 
Might not have been the case here, but a tach drive leaking oil can mimic a leak in the cam chain tunnel O-ring area due to the way the oil blows back into that space while riding.

Goor Ridin'
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.

1972 Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A

www.kawasaki-z-classik.com
An enthusiast's forum focused exclusively
on all things Z1, Z2 and KZ900.

The following user(s) said Thank You: howardhb, Rolf1976_KZ900

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

Somebody Blew It 10 Dec 2023 06:10 #892512

  • Nessism
  • Nessism's Avatar
  • Offline
  • Sustaining Member
  • Posts: 7275
  • Thank you received: 2669
I doubt that those cooling passages being blocked is responsible for the failure of that gasket.  I'd punch them out when reboring, though.

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

Somebody Blew It 10 Dec 2023 09:32 #892523

  • Rolf1976_KZ900
  • Rolf1976_KZ900's Avatar
  • Offline
  • User
  • Posts: 239
  • Thank you received: 108

 

Might not have been the case here, but a tach drive leaking oil can mimic a leak in the cam chain tunnel O-ring area due to the way the oil blows back into that space while riding.

Goor Ridin'
slmjim & Z1BEBE

I know and i checked the tach drive for leaks PO had had the bike into a kawa dealer that had replaced the orings.After washing engine i stuffed paper into the area around the tacho drive .It was leaking a tiny bit but still came oil from the area on the picture

 
Attachments:

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

Somebody Blew It 10 Dec 2023 09:44 #892524

  • Rolf1976_KZ900
  • Rolf1976_KZ900's Avatar
  • Offline
  • User
  • Posts: 239
  • Thank you received: 108
Daevo sorry for highjack the tread .if you want the sleeves you can have them for 40 usd for all 4 shipping from Norway is about  40usd i think i will check if you vant them

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

Somebody Blew It 10 Dec 2023 10:03 #892525

  • Mikaw
  • Mikaw's Avatar
  • Offline
  • Sustaining Member
  • Posts: 4887
  • Thank you received: 1849

Daevo sorry for highjack the tread .if you want the sleeves you can have them for 40 usd for all 4 shipping from Norway is about  40usd i think i will check if you vant them
If Daveo doesn’t want the sleeves I’d be interested. TY.
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.

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

Powered by Kunena Forum