Kx 85 tapping noise at idle

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8/9/2017 1:04 AM

Hi there hoping someone can help me out.
My sons kx 85 2015 is making a tapping noise at idle as soon as you open the throttle a bit above it stops?
It has just had a full rebuild bottom and top ends main bearings and seals all genuine parts.
I sent the barrel away and had it recoated as well it had a small mark on the bore.
We thought the noise might of been the power valves in the bore so i have replaced them as well but its still making the noise not dure what do next any ideas would be a great help.
Cheers.

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8/9/2017 4:35 AM

Does the noise go away or change pitch if you pull the clutch in? Do you have a cast or forged piston?

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8/9/2017 6:04 AM

Its not top or main bearings. Usually something like this is a pipe or something touching the motor, clutch, power valve timer or bearing.

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8/9/2017 6:08 AM

powervalve. normal.

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8/10/2017 4:46 PM

MotoChris wrote:

Does the noise go away or change pitch if you pull the clutch in? Do you have a cast or forged piston?

No the noise stays the same when i pull the clutch leaver.
And it has a forged piston.

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8/10/2017 4:48 PM

dboivin wrote:

powervalve. normal.

Its just that he also has a 2010 85 as wrll and it doesn't make the same noise at all its very loud.
But i have heard that.
Thanks mate.

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8/10/2017 4:49 PM

resetjet wrote:

Its not top or main bearings. Usually something like this is a pipe or something touching the motor, clutch, power valve timer or bearing.

No worries ill try and have a better look.
Thanks.

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8/10/2017 4:59 PM

Did you check piston clearance before installing the head?
Sounds like the piston is kissing the head, but just barley?
Remove the head and see if there is a small mark where it's touching the piston.

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8/10/2017 5:00 PM

dboivin wrote:

powervalve. normal.

dan-dev wrote:

Its just that he also has a 2010 85 as wrll and it doesn't make the same noise at all its very loud.
But i have heard that.
Thanks mate.

Some are louder than others. I help a friend on his bikes and he had two 2016's one was much louder than the other. Tore apart and looked great. The only thing you might check is powervalve preload on the arm..Setting it correctly when installing side case might have some affect on it but some are just noisy........

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8/10/2017 5:07 PM

My kids 85 and 100 had same noise...Didnt bother him but it bugged me

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Don't be a Pussy...

8/10/2017 8:18 PM

speed_racer wrote:

Did you check piston clearance before installing the head?
Sounds like the piston is kissing the head, but just barley?
Remove the head and see if there is a small mark where it's touching the piston.

Hi mate i did check it before i installed it but ill take it off and have a look.
Thanks.

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8/10/2017 8:19 PM

dboivin wrote:

powervalve. normal.

dan-dev wrote:

Its just that he also has a 2010 85 as wrll and it doesn't make the same noise at all its very loud.
But i have heard that.
Thanks mate.

Tracktor wrote:

Some are louder than others. I help a friend on his bikes and he had two 2016's one was much louder than the other. Tore apart and looked great. The only thing you might check is powervalve preload on the arm..Setting it correctly when installing side case might have some affect on it but some are just noisy........

No worries thanks ill check it out.

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8/10/2017 8:21 PM

olympiamann wrote:

My kids 85 and 100 had same noise...Didnt bother him but it bugged me

I know what you mean my son cant hear it but it drive's me nuts.
Thanks.

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8/10/2017 9:33 PM
Edited Date/Time: 8/10/2017 9:34 PM

olympiamann wrote:

My kids 85 and 100 had same noise...Didnt bother him but it bugged me

dan-dev wrote:

I know what you mean my son cant hear it but it drive's me nuts.
Thanks.

rebuilt so many 85's and 125's and its a sound that you don't hear when your riding. but after you rebuild something it drives you nuts because you're so worried you did everything right you notice the hell out of it.

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8/10/2017 10:52 PM

I think its normal powervalve noise

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8/10/2017 11:11 PM
Edited Date/Time: 8/10/2017 11:23 PM

Check that your motor and head mounts are secured and torqued. Also, check to see the pipe is secured and using both springs while making sure it is snug at the frame mount area(s). Add to that, check how secure the silencer is at the connection points. Do the appropriate places still have all of the rubber parts? Sounds like something loose that vibrates at low rpm and smoothes out at higher rpm. PV is also a possiblity, as others have mentioned.

Or, could be panametric fam.

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much ty. How to spot a paid forum poster/artificial forum traffic producer (see list of actions/phrases below):

Copius pattern amounts of phrases like “Anyone have”..., “Anybody know?”.... and their variations.

Thoughts?
Any help is appreciated!
Thanks in advance!





8/10/2017 11:51 PM

kzizok wrote:

Check that your motor and head mounts are secured and torqued. Also, check to see the pipe is secured and using both springs while making sure it is snug at the frame mount area(s). Add to that, check how secure the silencer is at the connection points. Do the appropriate places still have all of the rubber parts? Sounds like something loose that vibrates at low rpm and smoothes out at higher rpm. PV is also a possiblity, as others have mentioned.

Or, could be panametric fam.

Hi there i have checked all the mounts and replaced the springs new o ring at the outlet new rubber at the silencer.
Re checked the head and jug pot bolts and all tight.
As i ve said i re placed the 2 valves in the pot and new shaft only thingi havent replaced is the kips shaft.
The intake side has been ported so im not sure if that has something to do with the noise but i wouldn't think so.
Thanks.

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8/11/2017 12:02 AM

kzizok wrote:

Check that your motor and head mounts are secured and torqued. Also, check to see the pipe is secured and using both springs while making sure it is snug at the frame mount area(s). Add to that, check how secure the silencer is at the connection points. Do the appropriate places still have all of the rubber parts? Sounds like something loose that vibrates at low rpm and smoothes out at higher rpm. PV is also a possiblity, as others have mentioned.

Or, could be panametric fam.

Also not sure what you mean by "panametric fam"?
Cheers.

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8/11/2017 12:17 AM
Edited Date/Time: 8/11/2017 12:39 AM

kzizok wrote:

Check that your motor and head mounts are secured and torqued. Also, check to see the pipe is secured and using both springs while making sure it is snug at the frame mount area(s). Add to that, check how secure the silencer is at the connection points. Do the appropriate places still have all of the rubber parts? Sounds like something loose that vibrates at low rpm and smoothes out at higher rpm. PV is also a possiblity, as others have mentioned.

Or, could be panametric fam.

dan-dev wrote:

Also not sure what you mean by "panametric fam"?
Cheers.

That part was just a joketongue

Hmm, well it does sound perplexing. It still sounds like something is loose (or compromised/cracked) as the sound goes away at a smoother operating rpm (harmonious balance). If you've checked the motor mounts at the swingarm and base and they check out, then maybe it is the pv. When components are cool, start it and feel areas for vibration. Try stabilizing with your hand and see if you can "make" the sound go away. Trouble shoot different parts, etc. Im curious what it is.

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much ty. How to spot a paid forum poster/artificial forum traffic producer (see list of actions/phrases below):

Copius pattern amounts of phrases like “Anyone have”..., “Anybody know?”.... and their variations.

Thoughts?
Any help is appreciated!
Thanks in advance!





8/11/2017 12:45 AM
Edited Date/Time: 8/11/2017 2:31 AM

kzizok wrote:

Check that your motor and head mounts are secured and torqued. Also, check to see the pipe is secured and using both springs while making sure it is snug at the frame mount area(s). Add to that, check how secure the silencer is at the connection points. Do the appropriate places still have all of the rubber parts? Sounds like something loose that vibrates at low rpm and smoothes out at higher rpm. PV is also a possiblity, as others have mentioned.

Or, could be panametric fam.

dan-dev wrote:

Also not sure what you mean by "panametric fam"?
Cheers.

kzizok wrote:

That part was just a joketongue

Hmm, well it does sound perplexing. It still sounds like something is loose (or compromised/cracked) as the sound goes away at a smoother operating rpm (harmonious balance). If you've checked the motor mounts at the swingarm and base and they check out, then maybe it is the pv. When components are cool, start it and feel areas for vibration. Try stabilizing with your hand and see if you can "make" the sound go away. Trouble shoot different parts, etc. Im curious what it is.

Ha ha nice one like the old flux capacitor i have done all of that its just not a nice noise at all if you go to You Tube and search kx 85 engine noise problem its the same noise and it makes my skin crawl and think the worst.
Thanks heaps mate.

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