Loss of power and valve tapping - Kawasaki Forum :: KawasakiWorld.com
 
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post #1 of 12 Old 05-27-2019, 03:36 PM Thread Starter
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Loss of power and valve tapping

I'm new to the forum and I tried doing a search but looked through 2 pages of search results and I couldn't find specifically what I was looking for. My bike is a 2000 ZX-12 with 54K miles.
I was driving to work a couple weeks ago at about 6K RPM when all of a sudden the bike sputtered and began making a tapping noise. I pulled over and it died but I was able to restart and limp the 5 miles back home under reduced power. It won't idle anymore unless I keep the rpm's high and the tapping is synced with engine speed. It's been parked since this happened.
I checked the valves today and 4 of them are out-of-spec...all on the exhaust side and all too tight. I did a valve adjustment about 20K miles ago so that's why most are still in alignment now. 3 of the out-of-spec ones are only off by one shim size but the 4th has zero clearance.
Is there a chance that the tapping I'm hearing is coming from the piston hitting that 4th valve? Is the valve opening too far and hitting the piston? It's cylinder number one.
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post #2 of 12 Old 05-27-2019, 03:40 PM
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pull the oil pan and check for gold flakes.

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 #3 of 12 Old 05-27-2019, 03:55 PM Thread Starter
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Originally Posted by KZScott View Post
pull the oil pan and check for gold flakes.
Would that be shavings from the valve seat? The noise is definitely coming from the top of the motor.
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post #4 of 12 Old 05-27-2019, 07:14 PM
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rod bearings

its possible its spit a valve shim and its sitting in there sideways taking up all the clearance, but im guessing the noise is the piston hitting the head.

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

Last edited by KZScott; 05-27-2019 at 07:17 PM.
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post #5 of 12 Old 05-28-2019, 04:33 PM Thread Starter
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Ok, sounds like a rebuild is in store if that’s the case. Since the bike is fine otherwise, I may just do that. I bought the bike new so I’m kind of attached to it after almost 20 years of owning it.
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post #6 of 12 Old 05-28-2019, 06:46 PM
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its just letting you know its ready for upgrades

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 #7 of 12 Old 05-29-2019, 06:13 AM Thread Starter
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its just letting you know its ready for upgrades
Haha. It’s got an expensive way of showing it.
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post #8 of 12 Old 05-29-2019, 07:04 PM
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its how mine tell me lol

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 #9 of 12 Old 06-07-2019, 12:03 PM Thread Starter
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I've got most everything disconnected and fluids drained so I'm hoping to drop the motor this weekend. I've started looking at piston kits and I'd like to go bigger with a JE 1287 kit. I plan on dropping the heads off at the machine shop too and have them go through it but do you think I should replace anything in the head ( springs/seats/etc. ) since the motor does have 55K on it and I'm planning on keeping the bike for many more years?
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post #10 of 12 Old 06-07-2019, 05:03 PM
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You should replace anything you can afford to if you are keeping it. You are already in there, so don't skimp.
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post #11 of 12 Old 06-08-2019, 08:24 AM
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springs and valve seals

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 #12 of 12 Old 06-11-2019, 04:04 PM Thread Starter
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Thanks for the advice, guys. I don't mind spending some extra money on it since it's been pretty much problem-free all these years. I didn't get the engine dropped over the weekend as I had a hard time getting the front sprocket nut off and family stuff to do. I ended up wedging a piece of rebar in the rear wheel spokes to stop it from rotating. I'll get it dropped this upcoming weekend (I hope). I have the shop manual so I've been following that.
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