2016 Kx450F Loud Loud Tick.

Fmxrider17
Hey guys ! New to the forum here hoping for some answers from you lovely people.
Last year i bought a 2016 Kx450f with 16 hours on it. Bike was well taken care of before i owned it. Mid last summer the bike randomly started Ticking in the top end ( or so it sounds ) with 20 hours on it. Kinda parked it for summer and now ive been trying to get it fixed for a month or so now. Ive done all the basics. Changed oil. valves, checked timing. I got lost so i dropped it off at my buddies whos a mechanic, he went through the top end and eveything seems fine so now its back in my hands because he doesnt want to start tearing apart the boittom without really having an idea where this is coming from. Has anyone had a similiar issue? Decompression valve? are those replacable or is it part of the cam?
i have attatched a video to go with this to give you guys a good listen!
Cheers !
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kb228
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kb228 6/10/2019 6:13pm
6/10/2019 6:13pm
Two things id look at before diving deep into the motor.

Timing chain tensioner & excessive valve clearance
RGaede
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RGaede 6/10/2019 7:57pm
6/10/2019 7:57pm
What he said, and another easy thing to check is the idle speed, people commonly set the idle too low on fi bikes and you'll hear the decompressor activating if it's too low
Paw Paw 271
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Paw Paw 271 6/11/2019 9:34am
6/11/2019 9:34am
Does the noise change when you pull in the clutch lever while running?

Paw Paw
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dancolvin633
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dancolvin633 6/11/2019 10:17pm
6/11/2019 10:17pm
Paw Paw 271 wrote:
Does the noise change when you pull in the clutch lever while running?

Paw Paw
My 19 makes this same noise... took it back to Dealer for warranty since it had 18 hours on. They said the top end was worn out, and no possible way that happened... they replaced the whole top end, cylinder and all. Still makes the same noise. When I pull in the clutch the noise gets slightly better?? What’s your thought Paw Paw? I have another 19 that sounds normal...

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Fmxrider17 6/11/2019 11:28pm
6/11/2019 11:28pm
Paw Paw 271 wrote:
Does the noise change when you pull in the clutch lever while running?

Paw Paw
Ya no difference man. I think it's alot worse than that... Any other ideas ? Worth swapping out the tensioner just to narrow things down ?
kb228
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kb228 6/12/2019 3:56am
6/12/2019 3:56am
Paw Paw 271 wrote:
Does the noise change when you pull in the clutch lever while running?

Paw Paw
Fmxrider17 wrote:
Ya no difference man. I think it's alot worse than that... Any other ideas ? Worth swapping out the tensioner just to narrow things down ?
Go to harbor freight and get a mechanics stethoscope. They cost like $3. Stick it around your motor while its running and youll hear where that sound is coming from and that will narrow it down quickly.

As a matter of fact i did this not too long ago on a zx10 that had a ticking noise. Owner wanted to put new pistons in and adjust the valves. Turned out the tensioner was bad.
Grovesy98
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Grovesy98 11/22/2020 3:03pm
11/22/2020 3:03pm
This is exactly what my 2020 sounds like right now. Did you find the issue causing the ticking? Just had a new top end done and valve clearences set but still the same
Fmxrider17 11/23/2020 11:48am
11/23/2020 11:48am
Grovesy98 wrote:
This is exactly what my 2020 sounds like right now. Did you find the issue causing the ticking? Just had a new top end done and...
This is exactly what my 2020 sounds like right now. Did you find the issue causing the ticking? Just had a new top end done and valve clearences set but still the same
I did actually... I put my oil filter in backwards.. wore the top of the cam cap so it was the cam slapping up and down. Got a bare head and swapped everything over and all is good.

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