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BIKELAND > FORUMS > ZX-14.com > Thread: Has Anyone Seen This Before? NEW TOPIC NEW POLL POST REPLY
BrucerZX14


Expert Class
Posts: 364
posted June 17, 2012 03:20 PM        
Has Anyone Seen This Before?

Out racing this past weekend and the #2 cylinder quits. No strange mechanical sounds. Get it home and pull the plug. Here's what I found. There are no impact marks at all on the ground. The ground just rolled over and caused a very small gap so the ground never hit the center electrode.

Background info. Competition CNC SS head. 50 shot of nitrous on a progressive controller. Bike ran great thru the entire pass. No over-rev. Noticed the poor idle when I made the hit the return road. Has anyone seen this before?


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1badzx12r


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Posts: 8321
posted June 17, 2012 03:24 PM        
..you got your money worth from your 50 shot and CNC head ..cause air didn't cause that
____________
http://www.youtube.com/watch?v=S06nIz4scvI

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kawasakijockey


Pro
Posts: 1876
posted June 17, 2012 03:32 PM        
Piston kiss or detonation..
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Get on the shortbus boys 'cause its time to get schooled.
2007 ZX-14
1.38 60ft
9.03 @ 149mph
8.95 @153 small shot n2o
8.68 @160mph 5lbs boost

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BrucerZX14


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Posts: 364
posted June 17, 2012 03:32 PM        Edited By: BrucerZX14 on 17 Jun 2012 22:35
1bad - That's why I'm asking. There are zero impact marks on the ground. If something came loose and hit it, there should be a mark on the ground and on the piston. Looking down thru the plug hole, there's no mark on the piston either. Gonna do a compression check and borescope the hole and see if there's an issue.
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BrucerZX14


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Posts: 364
posted June 17, 2012 03:37 PM        
Kawjockey - Quite possible on the detonation. There are no marks on the piston or plug from an impact. The other plugs are a light tan color. Gonna check compression and scope it. If all looks good, I'll put fresh plugs in it and see if I can get it back on a dyno.

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1badzx12r


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posted June 17, 2012 03:46 PM        Edited By: 1badzx12r on 17 Jun 2012 22:48
quote:
. There are zero impact marks on the ground. .



i doubt you'll see any impact from that light of a tap.. but something touch it


just think when you drop a plug and close the gap it leaves no mark
____________
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1badzx12r


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posted June 17, 2012 03:54 PM        
hey did your track reopen
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http://www.youtube.com/watch?v=S06nIz4scvI

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BrucerZX14


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posted June 17, 2012 07:19 PM        
The track has been bought and we're waiting for the new owner to open it.


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1badzx12r


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posted June 17, 2012 07:23 PM        
quote:
The track has been bought and we're waiting for the new owner to open it.





cool let us know when they have their grand opening race
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BrucerZX14


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posted June 17, 2012 08:32 PM        
I will. Hopefully I'll have mine repaired by then.

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BrucerZX14


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posted July 03, 2012 06:23 PM        Edited By: BrucerZX14 on 4 Jul 2012 01:23
Well...finally got back to the bike to figure out my problem. #2 cylinder has extremely low compression. Did a leak down test and felt air coming out the exhaust port. SUCKS!!!! In the process of yankin' the head. Hope it don't cost much to fix it.

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1badzx12r


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posted July 03, 2012 07:52 PM        
quote:
Did a leak down test and felt air coming out the exhaust port.



i'm taking it you did had gap under your exhaust cam when you did this..(valve clearance)
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BrucerZX14


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posted July 03, 2012 08:11 PM        Edited By: BrucerZX14 on 4 Jul 2012 03:19
No. Just felt air coming out even with cams removed. Hope to have the head off tomorrow. Not much more to do to get it off.

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BrucerZX14


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posted July 03, 2012 08:50 PM        
Just pulled the bucket/shims off all the valves and they all look the same. Even the #2 cylinder. Wondering if the seat is broke or chipped a valve. Find out tomorrow.

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1badzx12r


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posted July 04, 2012 05:58 AM        
quote:
No. Just felt air coming out even with cams removed. Hope to have the head off tomorrow. Not much more to do to get it off.



i alway check valve clearance before cam removing .. it helps to diagnose the problem

cams removed is the easiest way to leakdown .. you have either a bent valve or burnt valve . or something stuck under the valve ..


if you'd check clearance you would have a better idea... cause the valve being hung open would give you a big clearance.

if its a bent valve some how that piston jump up and hit it ..and seeing that plug bent .. i'd look at that rod bearing
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joseph702


Zone Head
Posts: 598
posted July 04, 2012 08:05 AM        
maybe rod streach or somthing my ss sport head did same thing at 10,000 rpm , but mine ended up being from thin head gasket with ss sport head.
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BrucerZX14


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posted July 04, 2012 08:54 AM        
Well. Broken piston. No damage to cylinder wals. Gotta pop the valves out and look at them yet. Here's the piston.



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1badzx12r


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posted July 04, 2012 09:18 AM        
i broke 1 just like that before
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06redzx14


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posted July 04, 2012 10:06 AM        
X2 have those injectors cleaned before you but it back together
____________
06 alien head, no flies, PC+hub, 16/45 44 43, air shifter, dry shot

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zixxer14


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Damn that was Quick
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posted July 04, 2012 10:12 AM        
Ouch, any idea what caused that?
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BrucerZX14


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Posts: 364
posted July 04, 2012 10:34 AM        Edited By: BrucerZX14 on 4 Jul 2012 17:34
Zixxer - Suspecting detonation. Good thing is the cylinder wall wasn't damaged so it won't be too expensive to fix.

06Red - Gonna look at everything before it goes back together.

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1badzx12r


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posted July 04, 2012 10:52 AM        
it looks like the piston next to it on the bottom of the pic has detonation also
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JZX


Zone Head
Posts: 943
posted July 04, 2012 11:15 AM        
How are the valves in the head?
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06 ZX14 65"

Best 1/8 mile 5.68@126.4 on a 1.41 60'
Best 1/4 mile 8.87@152.7 on a 1.47 60'


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BrucerZX14


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Posts: 364
posted July 04, 2012 11:36 AM        
They look alright as installed but haven't popped them out yet so I can look at the valve seat. Gotta get my hands on a spring compressor tomorrow and go from there.

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06redzx14


Pro
Posts: 1022
posted July 04, 2012 01:19 PM        
That is a lean/detonation issue. My number 1 cylinder was leaner than the rest a couple years ago. Found out the injector was bad when I sent them to be cleaned.

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06 alien head, no flies, PC+hub, 16/45 44 43, air shifter, dry shot

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