Loss of power and valve tapping - Page 2 - Kawasaki Forum :: KawasakiWorld.com
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post #16 of 34 Old 06-22-2019, 07:40 AM Thread Starter
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I’m not finding your build post searching from my phone. I only get 3 results and they’re all where you’ve mentioned your post but not the post itself. Lol. I’ll search from my computer later.

I checked out the JE 1287 piston kit at ZX Zone and they offer a cylinder head exchange, so if my cylinder is to chongered up to fix via boring I can go that route. I guess my main concern now is whether the bent valve has rendered the head un-usable or if I can somehow get the damage machined out. I attached pics of the damage in my last post and I’m hoping one of the gurus here can chime in with their opinion.
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post #17 of 34 Old 06-23-2019, 10:27 PM
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That head and block are toast. Iy has gouged the cylinder walls so much that I don't see a repair for that. The head is in bad shape as well. I would look for a new engine and use that as parts.
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post #18 of 34 Old 06-24-2019, 12:25 AM
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Why not just buy the bits you need ?, complete engines are expensive ?
https://www.ebay.co.uk/itm/Kawasaki-...UAAOSwTa5bTyZH

*** ZX12-R ~ RT2 360 ~ XR650R ~ DT175MX ***

Last edited by Mauser; 06-25-2019 at 12:13 AM.
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post #19 of 34 Old 06-24-2019, 03:27 PM
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that cylinder block is a perfect core for a 3mm big bore kit

the head can be fixed, but replacing the seat and guide and getting a valve job might run more than a good used head. check with carpenter racing or competition cnc.

01 ZX-12R 8.84 @ 156.3 on dot tires, NA.... turbo 8.47 @ 164
00 ZX-12R 8.62 @ 165.2 no bars, slicks, 55 shot... turbo 8.32 @ 173
00 ZX-12R 1: 222.046 1.5: 226.390 Worlds Fastest NA Kawasaki
00 ZX-12R street turbo 1: 227.9 1.5: 234.1
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Worlds fastest ZX-12R CMG Racing RCC Turbos
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post #20 of 34 Old 06-25-2019, 09:40 PM Thread Starter
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I'm going to go with the 1287 kit at the ZX Zone website KAWASAKI ZX PISTON KITS
I'm not finding any ZX12 stuff at Competition cnc's website...just ZX14 and Hayabusa parts. I don't minding spending up to $1K on a cylinder head/valves. I checked ebay and there's a couple on there. The one I'm interested in is this: https://www.ebay.com/itm/2000-2001-0...oAAOSwizpc1CfV

Do I need to remove the clutch hub nut/washer to separate the cases? The manual recommends it. I can't stop that sucker from spinning. It looks like Kawasaki has a special clutch hub tool to hold it in place while you loosen the nut. I think I saw a couple threads on here about it. I'll check them out.
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post #21 of 34 Old 06-25-2019, 09:48 PM
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Off topic, but it seems more lucrative to part these bikes out than to sell as a whole......
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post #22 of 34 Old 06-26-2019, 05:07 PM Thread Starter
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I contacted ZX Zone today and they want my core 1st to see if it qualifies for the swap. I'll probably have to wait until the weekend to send it. Regarding the clutch hub nut, I found some posts and it looks like it would've been easier to remove if the motor was still in the bike. I could've wedged the rear wheel like I did when I removed the front sprocket...now I'm going to have to order a clutch hub holder. It's ok, it's only $24 at Amazon.
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post #23 of 34 Old 06-26-2019, 08:15 PM
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Quote:
Originally Posted by Rep94401 View Post
I'm going to go with the 1287 kit at the ZX Zone website KAWASAKI ZX PISTON KITS
I'm not finding any ZX12 stuff at Competition cnc's website...just ZX14 and Hayabusa parts. I don't minding spending up to $1K on a cylinder head/valves. I checked ebay and there's a couple on there. The one I'm interested in is this: https://www.ebay.com/itm/2000-2001-0...oAAOSwizpc1CfV

Do I need to remove the clutch hub nut/washer to separate the cases? The manual recommends it. I can't stop that sucker from spinning. It looks like Kawasaki has a special clutch hub tool to hold it in place while you loosen the nut. I think I saw a couple threads on here about it. I'll check them out.
give cnc a call and talk to Jim Gilnack

the easy way to remove the clutch hub nut is to put a complete clutch pack in, push in on it with your hand, and rattle it off with an impact. i do it all the time.

01 ZX-12R 8.84 @ 156.3 on dot tires, NA.... turbo 8.47 @ 164
00 ZX-12R 8.62 @ 165.2 no bars, slicks, 55 shot... turbo 8.32 @ 173
00 ZX-12R 1: 222.046 1.5: 226.390 Worlds Fastest NA Kawasaki
00 ZX-12R street turbo 1: 227.9 1.5: 234.1
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Worlds fastest ZX-12R CMG Racing RCC Turbos
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post #24 of 34 Old 06-27-2019, 04:59 PM Thread Starter
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Quote:
Originally Posted by KZScott View Post
give cnc a call and talk to Jim Gilnack

the easy way to remove the clutch hub nut is to put a complete clutch pack in, push in on it with your hand, and rattle it off with an impact. i do it all the time.
Thanks for the contact info for Jim...I'll reach out to him. I looked through my tools and found a clutch hub tool that I bought so long ago I forgot I had it, so I think I'm good as far as removing the nut.
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post #25 of 34 Old 07-02-2019, 05:36 PM Thread Starter
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I got the crankcase split and got to look at the bearings. I removed the cylinder #1 connecting rod and the bearing actually looks ok. I didn't find any flakes from the bearings in the oil pan either so I'm thinking it's only a dropped valve. I'm posting some pictures...can you guys let me know what you think? Should I replace the connecting rod/crankshaft bearings since I'm in there? Do I need to get the crankshaft machined if I do so?
Attached Images
File Type: jpg bearings2.jpg (738.0 KB, 10 views)
File Type: jpg bearings3.jpg (716.9 KB, 10 views)
File Type: jpg bearings.jpg (864.8 KB, 11 views)
File Type: jpg bearings4.jpg (642.8 KB, 10 views)
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post #26 of 34 Old 07-02-2019, 09:09 PM
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Always replace bearings. Mic crank and at least polish. I thought in pic 2 that bearing was scored, but it looks like an oil channel. Hard to tell.

Last edited by Jpowell490; 07-02-2019 at 09:12 PM.
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post #27 of 34 Old 07-03-2019, 01:54 AM
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Got my JE Piston/cylinder kit through ZX Zone too. I got my main bearings changed at the time of rebuild, as advised by the builder.
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post #28 of 34 Old 07-03-2019, 01:48 PM Thread Starter
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Thanks, guys, any suggestions on where to get the bearings? I think as the 12 gets further out of production there's going to be less options. I did a google search and came up with this place:
https://www.rcsperformanceonline.com...p/zx12r-mb.htm

If I get the crank polished do I need to get oversize bearings or can I continue to use stock size?
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post #29 of 34 Old 07-04-2019, 01:06 PM Thread Starter
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Originally Posted by Rep94401 View Post
If I get the crank polished do I need to get oversize bearings or can I continue to use stock size?
Never mind, I read through the manual and l have to plastigage to figure out bearing sizes. I haven't gone this deep into a motor since '98 when I rebuilt the motor on my old '78 KZ1000. I'm a little rusty on things. I put a 1397 kit in my 2000 'busa in '05 but I only had to dismantle it down to the cylinder block.
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post #30 of 34 Old 07-04-2019, 02:55 PM
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If it's a simple polish you should be able to use standard bearings. However, micijg the crank and plastigauge is an excellent idea. Good luck.
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