Valves chatter and tick more when engine is hot?

  • AaronOregon
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21 Jun 2012 11:51 #530734 by AaronOregon
Valves chatter and tick more when engine is hot? was created by AaronOregon
Sounds good cold, but once it heats up after riding for awhile and I stop the valvetrain is noisy. I just checked all the valve clearances a month or so ago. They are all within limit, but some may be on the tighter side. Is this chatter the tighter ones when they expand? It's not the chain as I just installed a manual adjuster and it is awesome! Thanks!

Aaron
1980 KZ750E - Pods - 4 into 1

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  • wireman
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21 Jun 2012 12:53 #530742 by wireman
Replied by wireman on topic Valves chatter and tick more when engine is hot?
Yes when valves heat up clearance shrinks B)
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.

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21 Jun 2012 13:41 #530747 by Patton
Replied by Patton on topic Valves chatter and tick more when engine is hot?

AaronOregon wrote: Sounds good cold, but once it heats up after riding for awhile and I stop the valvetrain is noisy. I just checked all the valve clearances a month or so ago. They are all within limit, but some may be on the tighter side. Is this chatter the tighter ones when they expand? It's not the chain as I just installed a manual adjuster and it is awesome! Thanks! Aaron


Could be the cold thicker oil is doing more padding between the cam lobes and buckets when the engine is first started. And when warmed, the oil thins to its normal operating viscosity.

Cam chain noise is often reduced by a good carb sync.

Good Fortune! :)
1973 Z1
KZ900 LTD
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21 Jun 2012 14:37 #530755 by DiamondSkyBlue1000
Replied by DiamondSkyBlue1000 on topic Valves chatter and tick more when engine is hot?
"Cam chain noise is often reduced by a good carb sync." -Patton

Yes! Thank you! Can't emphasize that enough. I think a lot of guys don't make that association and dismiss it too soon as a culprit for a noisy valvetrain.

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21 Jun 2012 15:59 #530769 by bountyhunter
Replied by bountyhunter on topic Valves chatter and tick more when engine is hot?
I'd also bet it's the oil thinning out. Mine gets more "clicky" when hot, I think it's normal.
1979 KZ-750 Twin

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21 Jun 2012 17:41 #530798 by RonKZ650
Replied by RonKZ650 on topic Valves chatter and tick more when engine is hot?
Exhaust leak.
321,000 miles on KZ's that I can remember. Not going to see any more.

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22 Jun 2012 01:07 #530900 by trianglelaguna
Replied by trianglelaguna on topic Valves chatter and tick more when engine is hot?
loose bore on number three and piston slap... :laugh:
1976 KZ900
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22 Jun 2012 01:30 #530912 by Motor Head
Replied by Motor Head on topic Valves chatter and tick more when engine is hot?
What oil are you using Aron? Delo or Rotella would be a good choice, non of that 5-30w crap.
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
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  • AaronOregon
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22 Jun 2012 01:49 #530921 by AaronOregon
Replied by AaronOregon on topic Valves chatter and tick more when engine is hot?
I think I put 15w-40 in it. Just cheap stuff. The bike cost me $200.....

Aaron
1980 KZ750E - Pods - 4 into 1

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22 Jun 2012 01:51 #530923 by AaronOregon
Replied by AaronOregon on topic Valves chatter and tick more when engine is hot?

Patton wrote:

AaronOregon wrote: Sounds good cold, but once it heats up after riding for awhile and I stop the valvetrain is noisy. I just checked all the valve clearances a month or so ago. They are all within limit, but some may be on the tighter side. Is this chatter the tighter ones when they expand? It's not the chain as I just installed a manual adjuster and it is awesome! Thanks! Aaron


Could be the cold thicker oil is doing more padding between the cam lobes and buckets when the engine is first started. And when warmed, the oil thins to its normal operating viscosity.

Cam chain noise is often reduced by a good carb sync.

Good Fortune! :)


Carb sync done last month with gauges.
1980 KZ750E - Pods - 4 into 1

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