Decked head

  • SWest
  • Topic Author
  • Offline
  • Sustaining Member
  • 10 22 2014
More
06 Nov 2019 06:24 - 06 Nov 2019 14:24 #813624 by SWest
Decked head was created by SWest
How much material can be removed from the surface of a KZ 1000 head and how can I tell if it's too much? The head is flat all along the surface area.
Steve

.002 moves freely

.003 is too tight
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
Attachments:
Last edit: 06 Nov 2019 14:24 by SWest. Reason: add pics

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

  • DoctoRot
  • Offline
  • Sustaining Member
  • Oh, the usual... I bowl, I drive around...
More
06 Nov 2019 12:14 #813637 by DoctoRot
Replied by DoctoRot on topic Decked head
Whats your goal by decking the head? If you just need a fresh surface they will remove a few thousandths and it wont really effect things. If you are trying to raise compression you need to measure the combustion chambers before decking, then you can then roughly calculate how much to remove based on the compression increase you would like.
'78 1000 Long Term Project
 '80 750G
 750 Twin Big Bore Track Bike
The following user(s) said Thank You: Scirocco

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

More
06 Nov 2019 12:51 #813638 by Dr. Gamma
Replied by Dr. Gamma on topic Decked head
I believe the shop manual wants you to check diagonally across cylinder head to check for warpage

1972 H2 750 Cafe Racer built in 1974.
1976 KH400 Production Road Racer.
1979 Kz1000 MK. II Old AMA/WERA Superbike.
1986 RG500G 2 stroke terror.
1986 GSXR750RG The one with the clutch that rattles!

Up in the hills near Prescott, Az.
Attachments:

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

  • SWest
  • Topic Author
  • Offline
  • Sustaining Member
  • 10 22 2014
More
06 Nov 2019 14:15 #813642 by SWest
Replied by SWest on topic Decked head
I suspect the head I'm working on has been decked. Maybe too much. That's why I ask.
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.

  • DoctoRot
  • Offline
  • Sustaining Member
  • Oh, the usual... I bowl, I drive around...
More
06 Nov 2019 14:20 - 06 Nov 2019 14:21 #813644 by DoctoRot
Replied by DoctoRot on topic Decked head
you can measure the combustion chamber volume and compare it against stock. this is how its done>
'78 1000 Long Term Project
 '80 750G
 750 Twin Big Bore Track Bike
Last edit: 06 Nov 2019 14:21 by DoctoRot.
The following user(s) said Thank You: SWest

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

More
06 Nov 2019 14:47 #813648 by DFIGPZ
Replied by DFIGPZ on topic Decked head
I have seen them decked clear down to edge of valve W/O issues. in fact I do the drag bikes to get the quench down.
1984 750 Turbo
The following user(s) said Thank You: SWest

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

More
07 Nov 2019 04:11 #813664 by Kidkawie
Replied by Kidkawie on topic Decked head
I saw a pic of a 900 head on this site where they just about cut into the fins.
1975 Z1 900
1994 KX250 Supermoto
2004 KX125

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

  • SWest
  • Topic Author
  • Offline
  • Sustaining Member
  • 10 22 2014
More
07 Nov 2019 11:24 #813680 by SWest
Replied by SWest on topic Decked head
This is what I'm working with.
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.

  • DoctoRot
  • Offline
  • Sustaining Member
  • Oh, the usual... I bowl, I drive around...
More
07 Nov 2019 15:42 - 07 Nov 2019 15:46 #813691 by DoctoRot
Replied by DoctoRot on topic Decked head
A KZ1000 head that has been decked 1mm will only have about a 3.8CC difference from stock, you need a piece of plexiglass held on with grease and a graduated cylinder to measure accurately. The surface tension of the fluid will make it impossible to check correctly without it

this is what i use

www.amazon.com/EISCO-Acrylic-Stopcock-Ca...id=1573170359&sr=1-3
'78 1000 Long Term Project
 '80 750G
 750 Twin Big Bore Track Bike
Last edit: 07 Nov 2019 15:46 by DoctoRot.
The following user(s) said Thank You: bluej58

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

  • SWest
  • Topic Author
  • Offline
  • Sustaining Member
  • 10 22 2014
More
07 Nov 2019 16:15 #813692 by SWest
Replied by SWest on topic Decked head
That's OK. I found out what I needed to know. I'm going to modify the chambers like I was talking about. I'm more concerned about the voids filling with carbon then glowing causing detonation. If I lose a little compression so be it. Who knows, the engine may breath better. :whistle:
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.

  • SWest
  • Topic Author
  • Offline
  • Sustaining Member
  • 10 22 2014
More
08 Nov 2019 08:30 #813712 by SWest
Replied by SWest on topic Decked head
I took a snippet out of the video I did when I installed the APE head studs. It shows the pistons below the deck almost 2mm. I don't think I'll have any problems there.
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.

More
08 Nov 2019 09:38 #813713 by zed1015
Replied by zed1015 on topic Decked head

SWest wrote: I took a snippet out of the video I did when I installed the APE head studs. It shows the pistons below the deck almost 2mm. I don't think I'll have any problems there.
Steve

If correct that is quite a lot .
Each 1mm of bore equates to around 4cc and an approximate compression loss of 2 points so you will be down substantially over stock depending on the pistons used.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





The following user(s) said Thank You: SWest

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

Powered by Kunena Forum

Forum Links