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TOPIC: Top-End Redo

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

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Don't see why you couldn't use the OEM gasket.
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Top-End Redo 05 Oct 2019 19:04 #811899

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

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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
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Last edit: by daveo.

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

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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
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Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStopPerformance , 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
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Top-End Redo 06 Oct 2019 10:11 #811921

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

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

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

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

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MTC G1135-3 Piston as provided:



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

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Head Gasket Comparison. Cometic and Genuine Kawasaki



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

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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.

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

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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
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Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStopPerformance , 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
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Top-End Redo 07 Oct 2019 08:40 #811986

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Are they sending you a new one?
Steve
Z1b1000 1975 Z1b
Opinions expressed by me do not reflect those of the the staff or members
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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Top-End Redo 07 Oct 2019 08:49 #811987

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SWest wrote: Are they sending you a new one?
Steve



Cometic said my supplier needs to take care of it, and resisted assisting any further on the matter.
So I sent another email to Joe...

:sick:

Update 10/08. Beep-beep-beep, ur-ur-ur, screech~~~uh...pop-boom

MTC says STOP!

:(
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Top-End Redo 07 Oct 2019 10:24 #811996

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Think the piston is the same as mine, forgot to say i also have Ape studs and head nuts.
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Top-End Redo 08 Oct 2019 07:25 #812057

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Street Fighter LTD wrote:

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



Oh brother... :ohmy:
Boys and girls, we have a problem here. I would rather ignore it and plunge in, but the respect for getting things right has stopped my progress dead cold.

Fortunately my oil sucking engine is still together, and running better than ever!
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Top-End Redo 08 Oct 2019 07:31 #812059

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Just keep a sharp eye on the oil and ride it until snow time
Dave
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Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStopPerformance , 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
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Top-End Redo 08 Oct 2019 07:46 #812061

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Street Fighter LTD wrote: Just keep a sharp eye on the oil and ride it until snow time
Dave


:laugh:

I've spent enough time and cash, and am biting at the bit to get this done. Having to wait for re-engineered and manufactured gaskets does not get it for me.
Double-checked the gasket opening relationship to piston diameter. The OEM Kawasaki gaskets easily fit over, but the Cometic don't...except for only one opening of the four. Hmmm.







:whistle:
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Top-End Redo 09 Oct 2019 17:55 #812145

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SWest wrote: Are they sending you a new one?
Steve



Apparently MTC got a bad batch and are returning their stock to Cometic, and will send me one of the correct size.
Anyone planning to assemble an engine with 2-pc. 74mm Cometic head gaskets should double check the bore measurements.

Sure am glad I caught this, and thanks again Dave A.

:)
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