zx12mark
Pro
Posts: 1654
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posted March 14, 2008 04:30 PM
timing chain wear---check this out
the service manual says the max. stretch on the timing chain is approx . 1 1/2 mm.
if it is your suppose to replace it AND THE CAMSHAFTS AND THE FUCKING CRANK SHAFT.
i guess they think the teeth on the sprockets are shot.i have 43,000 miles on the engine and you have to split the crankcase to replace the timing chain.i was planing on replacing it since its apart.what would you engine building guys do. i'm going to replace the chain anyway unless you talk me out of it.
   
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MadMike
Moderator
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Posts: 6579
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posted March 14, 2008 04:35 PM
You dont have to.... but since you have yours apart already...
I have buddy, that took a pair of vice grips and just snapped that little piece off below te cam chain... I used a dremel tool on the one I had. that allowed me to take the chain off without splitting the cases.
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zx12mark
Pro
Posts: 1654
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posted March 14, 2008 05:21 PM
i got a hatchet if i want to be a butcher........ANYWAY why did you replace your timing chain.
why did your buddy.thanks,mark
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NOX
Needs a job
PMRA / TMRC Super Street 4022
Posts: 3745
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posted March 14, 2008 05:57 PM
Why not.......
I have heard of a lot of motors going because they could have but did not.......
60 dollar part, well worth it, I did not change my cams though.......
I like MM's idea, that is a cool fix......
I will do that before I put my other motor back together.......
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aliveagain
Needs a life
Posts: 5033
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posted March 14, 2008 06:43 PM
I replaced mine because I kept getting different readings with a manual tensioner,sometimes loose,sometimes tight.I did not want to hop a tooth or touch a piston with a quick throttle change.
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krexken
Zone Head
Posts: 732
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posted March 14, 2008 07:35 PM
The only bad timing chains I've replaced were bad because the owners didn't know how to adjust their manual tensioner.
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MadMike
Moderator
FEAR THE BLACK FLAG!!!!!!!!
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posted March 14, 2008 09:03 PM
I have seen 2 of them that were not smooth... they had kinks in them... one mine and one on a rebuild I did... so I went ahead and replaced...
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zx12mark
Pro
Posts: 1654
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posted March 15, 2008 08:19 AM
i'm changing mine just because almost everycar i've had in the last 15 years says to change the timing belt or chain around 60,000 miles.they sure in the hell don't spin at 12,000 rpms.
NONE OF YOU GUYS HAS SAID ANYTHING ABOUT THE REPLACEMENT OF CAMS AND CRANK WHEN A TIMING CHAIN IS REPLACED.....THATS FUCKING NUTS!
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KZScott
Needs a life
high on speed
Posts: 7235
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posted March 15, 2008 10:39 AM
my cam chain had kinks, so did dads. both are getting replaced. didnt measure stretch. as far as cams go... just get adjustable sprockets if you think the teeth are worn... is there a way to measure them??
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zx12mark
Pro
Posts: 1654
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posted March 15, 2008 10:51 AM
just by comparing it to a new one i guess.
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KZScott
Needs a life
high on speed
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posted March 15, 2008 07:03 PM
i was asking about the teeth
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01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
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zx12mark
Pro
Posts: 1654
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posted March 15, 2008 10:20 PM
yes yes , by comparing cam sprockets....old to new..magnifiy those mothers.
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted March 16, 2008 08:17 AM
 Edited By: Y2KZX12R on 16 Mar 2008 09:26
quote:
The only bad timing chains I've replaced were bad because the owners didn't know how to adjust their manual tensioner.
Yep, too tight of an adjustment on a manual tensioner has runined many good engines.
As stated above, just remove the casting tab that prevents the chain from jumping a tooth while the chain is slack when the cams are removed etc. Its not needed as long as you make sure your in time at the crank and cam sprockets when you reassemble. Just snap it of and grind smooth. Keep the debri out of the crankcase by stuffing rags in the area.
I wouldnt worry about the gears being worn out, they should be fine as long as you dont see individual indentations in the gear of the alternating flat plate links. Typically worse on the crank than on the cam gears.
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aliveagain
Needs a life
Posts: 5033
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posted March 16, 2008 10:26 AM
Mine wore out before I had the manual adjuster on.I was told the stretch came from all the sudden on/off throttle inputs.
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I wondered why the baseball kept getting bigger. Then it hit me.
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