350x need help valve train noise

**Bigjohn1982** · 06-22-2017, 01:37 AM

https://youtu.be/zOHeuEo6j_c here is a better video

**Shawn Powell** · 06-22-2017, 12:35 PM

Sounds like either valve adjustment or your decompression valve is hanging open. Looked ok in the video but did you adjust that while you were at TDC as well? If it hangs open it can cause the exhaust valves to hang.

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**Bigjohn1982** · 07-01-2017, 11:57 PM

I have checked everything I know how too I went to the ATV store got a special feeler guage that they use and did the valves checked and changed oil again still doing it what is my next step

**BOB MARLIN** · 07-02-2017, 07:31 AM

Start it up and rest you finger on the decomp lever on the head, don't push it down, just touch it. See if you can feel anything, if you can your decomp is too tight and they will make noise.

**Bigjohn1982** · 07-02-2017, 09:19 AM

Originally Posted by BOB MARLIN

Start it up and rest you finger on the decomp lever on the head, don't push it down, just touch it. See if you can feel anything, if you can your decomp is too tight and they will make noise.

I am new to the 350x but I know the decompression doesn't work but I will try that here in a min me

**Bigjohn1982** · 07-02-2017, 10:52 AM

Originally Posted by Bigjohn1982

I am new to the 350x but I know the decompression doesn't work but I will try that here in a min me

Hell now I can't even start it I don't know what the heck is going on

**Bigjohn1982** · 07-02-2017, 01:24 PM

I put my finger on the decompression lever and it don't have any movement I bought the feeler guage from the shop he said he dose all the four stroke valves by hand but I insisted on a guage but it says .008 on one side and the other side says .25 witch I don't get. https://youtu.be/kFhB2Mqlswo

**Bigjohn1982** · 07-02-2017, 06:28 PM

Ok I checked the valves agine and they were to tight I tried the turn it over one more time till they are lose like the manual says but no luck I also figured out that the shop sold me a messed up Gage . Now I don't know were to start to get the lash right but on the f stroke you could stick a quarter in between the rocker and the valve and at t mark there is no play

**BOB MARLIN** · 07-03-2017, 07:52 AM

Even if the decomp doesn't work, if it still has the cable on it , they can still be to tight. Or the little spring on it could be jacked up. The decomps tend to break down in the bottom end when someone has been screwing around with the clutch and didn't pay attention when they put the side cover back on.

Also its possible the timing chain could be making noise too, but the 350x has an automatic tensioner on that so its unlikely.

Did I read that right- that you could stick a quarter between the rocker and valve ?. Yikes!!. If so, something is very wrong. I set mine at .003 / .005. The average piece of paper is about .003/.004 thick. I've never measured a quarter but its gota be at least 10 times as thick as paper.

**Bigjohn1982** · 07-03-2017, 08:22 AM

Originally Posted by BOB MARLIN

Even if the decomp doesn't work, if it still has the cable on it , they can still be to tight. Or the little spring on it could be jacked up. The decomps tend to break down in the bottom end when someone has been screwing around with the clutch and didn't pay attention when they put the side cover back on.

Also its possible the timing chain could be making noise too, but the 350x has an automatic tensioner on that so its unlikely.

Did I read that right- that you could stick a quarter between the rocker and valve ?. Yikes!!. If so, something is very wrong. I set mine at .003 / .005. The average piece of paper is about .003/.004 thick. I've never measured a quarter but its gota be at least 10 times as thick as paper.

yes I know it is a huge gap that's on one stroke and the other is about .003

**gimmeamidget** · 07-03-2017, 10:27 AM

I watched the videos and it sounds like it's getting worse. I am going with wonderboy on this one. I also think you put your oil filter in backwards and your cooking your valves. Please reread wonderboys comment.

**Bigjohn1982** · 07-03-2017, 01:26 PM

Originally Posted by gimmeamidget

I watched the videos and it sounds like it's getting worse. I am going with wonderboy on this one. I also think you put your oil filter in backwards and your cooking your valves. Please reread wonderboys comment.

I already checked that and it was fine and it hasn't been ridden sun I fixed the muffler and heard the ticking but the videos were taken with different phones and it hasn't been run longer than a few min since I tried the adjustment

**smokeycummer** · 08-26-2018, 03:26 PM

Originally Posted by Dbishop311

Download the free manual and it tells you how to adjust the vales.

http://www.oscarmayer.net/atc/manuals/

Anyone happen to know where I can get this where it still works this one keeps crashing , thanks

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**ironchop** · 08-26-2018, 04:38 PM

Originally Posted by smokeycummer

Anyone happen to know where I can get this where it still works this one keeps crashing , thanks

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Try here....
You can download the PDF to your phone
https://threewheelermanuals.com

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**smokeycummer** · 08-26-2018, 04:50 PM

Originally Posted by ironchop

Try here....
You can download the PDF to your phone
https://threewheelermanuals.com

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Thankyou very much

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Thread: 350x need help valve train noise

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Same noise

Another video link I think this is better