Welcome, Guest
Username: Password: Remember me

TOPIC:

Top-End Redo 05 Oct 2019 18:38 #811897

  • baldy110
  • baldy110's Avatar
  • Offline
  • User
  • Posts: 2272
  • Thank you received: 510
Don't see why you couldn't use the OEM gasket.
The following user(s) said Thank You: daveo

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

Top-End Redo 05 Oct 2019 19:04 #811899

  • SWest
  • SWest's Avatar
  • Offline
  • Sustaining Member
  • 10 22 2014
  • Posts: 22347
  • Thank you received: 2599
I've used a slightly smaller gasket with no ill effects. In fact I'm reusing a one piece Z1900 gasket now with no problems. The one I just ordered is 72mm and is the same as the last one. I replaced it when I installed my new APE studs earlier this year.
You shouldn't have a problem with the OEM one.
Steve
Attachments:
The following user(s) said Thank You: daveo

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

Top-End Redo 05 Oct 2019 19:16 #811901

  • daveo
  • daveo's Avatar Topic Author
  • Offline
  • Premium Member
  • Posts: 2756
  • Thank you received: 622

baldy110 wrote: Don't see why you couldn't use the OEM gasket.



Is it possible Cometic packaged the wrong size head gasket by mistake?

Considering the previous advice from Dave A. (Street Fighter LTD) was so well defined, I am now just a little uncertain about this.

:unsure:

Please view my reply post to Street Fighter LTD on page 3
1982 KZ1100-A2

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

Last edit: by daveo.

Top-End Redo 06 Oct 2019 05:58 #811912

  • Street Fighter LTD
  • Street Fighter LTD's Avatar
  • Away
  • Moderator
  • TURBO, Its Better to be Blown than Injected
  • Posts: 4797
  • Thank you received: 1952

daveo wrote:

baldy110 wrote: Don't see why you couldn't use the OEM gasket.



Is it possible Cometic packaged the wrong size head gasket by mistake?

Considering the previous advice from Dave A. (Street Fighter LTD) was so well defined, I am now just a little uncertain about this.

:unsure:

Please view my reply post to Street Fighter LTD on page 3


I will always defer to MTC / Joe Hopper / and Cometic
I just try and raise points to be considered .
As a lot of us have many years experience with kaws and hi performance motors you learn never to assume anything during a build
Check everything for proper fit and function . If you dont you may lose a race or a nice expensive street build and my pockets
are not as deep as they used to be .
Just verify with MTC or Joe H that you have the part that matches your application
Dave

Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
The following user(s) said Thank You: daveo

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

Last edit: by Street Fighter LTD.

Top-End Redo 06 Oct 2019 10:11 #811921

  • daveo
  • daveo's Avatar Topic Author
  • Offline
  • Premium Member
  • Posts: 2756
  • Thank you received: 622

Street Fighter LTD wrote:

daveo wrote:

baldy110 wrote: Don't see why you couldn't use the OEM gasket.



Is it possible Cometic packaged the wrong size head gasket by mistake?

Considering the previous advice from Dave A. (Street Fighter LTD) was so well defined, I am now just a little uncertain about this.

:unsure:

Please view my reply post to Street Fighter LTD on page 3


I will always defer to MTC / Joe Hopper / and Cometic
I just try and raise points to be considered .
As a lot of us have many years experience with kaws and hi performance motors you learn never to assume anything during a build
Check everything for proper fit and function . If you dont you may lose a race or a nice expensive street build and my pockets
are not as deep as they used to be .
Just verify with MTC or Joe H that you have the part that matches your application
Dave



Thanks Dave, I will definitely check into it.

Unless there is an actual 74mm. two-piece fiber alternative available, I will likely end up using the Genuine Kawasaki head gasket, considering the following information.

Besides having the slightly smaller cylinder opening, the Cometic gasket thickness is .15 to .20mm. thinner than the Kawasaki gasket. That is close to the .005" milled from the head in 2015, so there would be a further increase in compression with the Cometic, which would also bring the valves that much closer again to the pistons.

:huh:
1982 KZ1100-A2

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

Top-End Redo 06 Oct 2019 10:33 #811923

  • zippy61
  • zippy61's Avatar
  • Offline
  • User
  • Posts: 6
  • Thank you received: 7
I have a gpz1100b2 fitted with bathtub head and cams and have the MTC unitrack kit with 17mm wrist pins.Used cometic gaskets supplied without anything taken off piston crowns.I use Dyna 2000 for ignition and have RS34 carbs and bike runs great. have a large oil cooler and use 99 octane fuel here in the UK.
The following user(s) said Thank You: daveo

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

Top-End Redo 06 Oct 2019 13:00 #811933

  • daveo
  • daveo's Avatar Topic Author
  • Offline
  • Premium Member
  • Posts: 2756
  • Thank you received: 622

zippy61 wrote: I have a gpz1100b2 fitted with bathtub head and cams and have the MTC unitrack kit with 17mm wrist pins.Used cometic gaskets supplied without anything taken off piston crowns.I use Dyna 2000 for ignition and have RS34 carbs and bike runs great. have a large oil cooler and use 99 octane fuel here in the UK.



Please post a pic of a piston, and a couple or few of your bike?

:cheer:
1982 KZ1100-A2

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

Top-End Redo 06 Oct 2019 13:50 #811935

  • zippy61
  • zippy61's Avatar
  • Offline
  • User
  • Posts: 6
  • Thank you received: 7
Don't have piston pictures as the engine is built.it's the 1135 10.5 -1 compression kit for the unitrack motor.Maybe Joe recommended taking a bit off the crown because you skimmed the head.I'll post a couple pictures of the bike for you in a couple of days, need to use my wife's phone as mine is from the stone age.
The following user(s) said Thank You: daveo

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

Top-End Redo 06 Oct 2019 19:17 #811947

  • daveo
  • daveo's Avatar Topic Author
  • Offline
  • Premium Member
  • Posts: 2756
  • Thank you received: 622
MTC G1135-3 Piston as provided:



1982 KZ1100-A2

Attachments:

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

Top-End Redo 06 Oct 2019 19:27 #811948

  • daveo
  • daveo's Avatar Topic Author
  • Offline
  • Premium Member
  • Posts: 2756
  • Thank you received: 622
Head Gasket Comparison. Cometic and Genuine Kawasaki



1982 KZ1100-A2

Attachments:

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

Top-End Redo 07 Oct 2019 08:12 #811981

  • daveo
  • daveo's Avatar Topic Author
  • Offline
  • Premium Member
  • Posts: 2756
  • Thank you received: 622
Cometic Technical Service today put a halt to using either one of these gaskets. Said to "definitely use set having 74mm + bore opening for certain, and this set must have been improperly stamped when manufactured."

So, thank you again Dave for pointing this out. I prefer to err on the side of caution.

:)
1982 KZ1100-A2

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

Top-End Redo 07 Oct 2019 08:30 #811984

  • Street Fighter LTD
  • Street Fighter LTD's Avatar
  • Away
  • Moderator
  • TURBO, Its Better to be Blown than Injected
  • Posts: 4797
  • Thank you received: 1952

daveo wrote: Cometic Technical Service today put a halt to using either one of these gaskets. Said to "definitely use set having 74mm + bore opening for certain, and this set must have been improperly stamped when manufactured."

So, thank you again Dave for pointing this out. I prefer to err on the side of caution.

:)


I Hate being right to slow you down , Love it to keep your project bulletproof
Keep up the good work
Dave

Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
The following user(s) said Thank You: daveo

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

Powered by Kunena Forum