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Thread: another noise on start up

Created on: 07/10/21 08:30 AM

Replies: 4

dave350v8



Joined: 12/13/17

Posts: 103

another noise on start up
07/10/21 8:30 AM

Hi everyone
I started my 2008 zx14 for the first time in 6 weeks, oil pressured light went out straight away(whilst cranking) started instantly had the "cam chain rattle" for a few seconds as usual, also had a quiet mechanical noise on left hand side whilst it was warming up, anyone else had this? Went for 80 mile ride out no issues, motor really quiet !
Changed oil and filter 150 miles ago, running 4.1 litres of oil. Valve clearances done last year.
Any ideas guys?


* Last updated by: dave350v8 on 7/10/2021 @ 8:39 AM *

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Hub


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Joined: 02/05/09

Posts: 13724

RE: another noise on start up
07/10/21 10:20 PM

As in a tick sound? My experience is a tick means a tight valve lash. I know the valves were set... but first come back saying no not a tick. Say not a tick sound. Then it has to be constant on the procedure. Yes or no? Intermittent is no worry. Every 3-4 starts, worry.



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dave350v8



Joined: 12/13/17

Posts: 103

RE&#x3a&#x3b; another noise on start up
07/11/21 5:59 AM

Having listened to it again it sounds like it could be the headers popping/ticking until it warms up, is there anything mechanical that can make that noise on the left hand side of the motor? Thanks again


* Last updated by: dave350v8 on 7/11/2021 @ 12:37 PM *

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Hub


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Joined: 02/05/09

Posts: 13724

RE: another noise on start up
07/11/21 4:30 PM

Boy, that would be a small tick with expansion if it was the exhaust collar nuts backing out. The chase is on if you find a loose nut. I bought those short 10-12mm open/closed end wrenches for the tight work like the headers.

If you're hearing those ticks thru the fairing, and it goes away, think of it as tolerance noise. I explain 3 tick variables, see who it is?

1. Header Tick: You came up with that one and when expansion sets in, the noise goes away; that's an ever so backed out collar with nut still intact. No mechanical effect per say is the air pressure finding the fastest escape route.

2. Valve Tick: Back to my experience deliberately causing a tick on the valve lash to occur. Mechanically it is too tight meeting the valve heading back to its seat. The bigger gap and it would be away from it. Tick will occur hot or cold and will never go away. Adjustment needed/rechecked.

3. Piston Tick: This is where the the piston swaps sides on the up and down strokes. So think lowest part of the piston is the skirt. That's the tightest point. Paper thick, give or take another sheet or less is that clearance. When there is damage there it beings to snowball. The rubbing up and down removes that tight clearance and this tick begins to happen. It's not going to last for long and plus 80 mile on the first post, then out for another ride, you'd be heading home in a flatbed. Supreme mechanical damage.

Kind of relaxed about the mechanical(s)? An exhaust nut chase is one, the tick and goes away is not a tight valve, and you have too many miles for the snowballing effect to seize that one cylinder side. Each time you go out it's not puffing oil out the exhaust, plus you're not adding oil to the level. It's either 1 or 2 if you ask me.



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dave350v8



Joined: 12/13/17

Posts: 103

RE: another noise on start up
07/16/21 10:32 AM

Yep I’m going to have a go at tightening up header nuts it’s hardly noticeably but worth a try


* Last updated by: dave350v8 on 7/16/2021 @ 10:33 AM *

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