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Shot Caller
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 Post subject: Adjusting Valves on a GY6 ( How-To) With pics -Completed-
PostPosted: Wed Jun 03, 2009 11:24 am 
This is an updated version of a How-To on adjusting valves on a 150cc GY6 motor with two valves.

Tools that are needed for valve adjustment.
Image

1. So this is the valve cover you must remove and yours may look different as you may have a EGR system to it. If so you may need to remove that as well. I never had one so I have no ideal on that.
Image

2. This is what it should look like after the cover is off. The top valve is the intake and the one on the bottom is exhaust.
Image

3. Now you need to rotate the motor to get to TDC (Top Dead Center) This is what it should look like. The big hole should be at the top of the cam and there are two little holes with lines, the lines must be lined up with the case as in this picture. This was the best picture I could do with the motor installed.
Image

4. This is how I rotated my motor after I removed the spark plug. DO NOT use this method if your spark plug is still installed.
Image

5. You need to pick up some feeler gauges. This set can be found over at Battle Scooter Store.
Image

6. After you have it set up on TDC you need to check with a feeler gauge to see what the clearance is. I did look up what the valve clearance should be for the GY6 and found many answers. The best answer I found was to set both valves between .003" to .005". If you do not ride all that hard then set at .003", if you ride hard like most of us set between .004" or .005". I set mine to .005" and it is quite, not like before where the valve noise was louder than the engine.
Image

7. Now the real pain in the butt part. You need to loosen the nut that holds the valve adjuster. Mine uses a 9mm.
Image

8. After you loosen it you can adjust the valve by using a Crescent Wrench to move the valve tighter or looser. You need to move a little at a time and keep checking the clearance with the feeler. Once you have the valve adjusted you need to hold the valve adjuster with the wrench while tightening the hold nut. This part is not easy as I kept on moving the adjuster just a tad and you need to do it over. So after everything is tight recheck the clearance before moving down to the exhaust.
Image
Image

9. Once the intake valve is all adjusted correctly do it again for the exhaust valve.
Image

Hope this helps as there is not much out there on a How-To for the GY6. Please add you comments if you have any. I had to give back after all the How-To's I've used off TR.

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Last edited by RuckinJoe on Fri Jun 05, 2009 2:02 pm, edited 6 times in total.

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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics
PostPosted: Wed Jun 03, 2009 12:09 pm 
maybe it's the angle of the pic but this looks wayyy wrong

Image

at TDC, the 2 small dots on the cam should line up with the edge of the head and the big hole should be up in the middle

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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics
PostPosted: Wed Jun 03, 2009 12:31 pm 
You can also double check TDC by looking to see if the timing mark on the flywheel is lined up with the timing ridge on the right side case cover. Good write up Joe!

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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics
PostPosted: Wed Jun 03, 2009 1:07 pm 
BoostAddict wrote:
maybe it's the angle of the pic but this looks wayyy wrong



at TDC, the 2 small dots on the cam should line up with the edge of the head and the big hole should be up in the middle



+1. those dashes by the little holes should line up with the gasket surface of the head. the big hole should be up and in the middle.


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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics
PostPosted: Wed Jun 03, 2009 1:43 pm 
TypeR #126 wrote:
You can also double check TDC by looking to see if the timing mark on the flywheel is lined up with the timing ridge on the right side case cover. Good write up Joe!



I looked for marks on the case and could not find any. Do you have or found a picture of what it should look like? That was the one thing that was driving me nuts. Found this..


Copied from ScootDawg web site.
The safest way is to turn the flywheel till the aligment mark matches up on the flywheel with the lip. It has several markings on the flywheel, but one of them is the TDC (top dead center).
When you're there both valves should have a small gap, from there just adjust to youre liking :D ..

I will see if i find a good picture of it.
Another good thing to see if youre at TDC is looking at youre cam from the left side of the scoot. There you should have 3 holes, one pointing away from the cylinder and two that is leveld with the head if you know what i meen.

This is the cam, pic taken from a 50cc forum. they look the same, just size diffrence.anent ink; reference your mark to a point on the engine case.
Image

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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics
PostPosted: Wed Jun 03, 2009 2:02 pm 
My other question for anyone out there, what should the valve lash be set at. I read the numbers are between .003 to .006. i will be redoing mine again with the markings in the right place this time, I will try and take pictures of the cam shaft timing marks on my bike if I can. Plus at .005 I still have valve ticking so I'm going to try .004.

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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics
PostPosted: Wed Jun 03, 2009 3:29 pm 
Nice way to take the initiative on this. I'm watching this thread until the kinks get ironed out... Pics are super helpful! Nice job!

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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics
PostPosted: Wed Jun 03, 2009 4:07 pm 
RuckinJoe wrote:
My other question for anyone out there, what should the valve lash be set at. I read the numbers are between .003 to .006. i will be redoing mine again with the markings in the right place this time, I will try and take pictures of the cam shaft timing marks on my bike if I can. Plus at .005 I still have valve ticking so I'm going to try .004.

a manual i downloaded says .05mm or .00197. i'd just try .002.


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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics
PostPosted: Wed Jun 03, 2009 5:12 pm 
I did mine to .04 on both and it's run great ever since.

As for TDC, I just rotated the flywheel by hand till one lobe on the cam was at it's apex, then adjusted the opposite valve.


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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics
PostPosted: Wed Jun 03, 2009 5:58 pm 
undertheradar wrote:
I did mine to .04 on both and it's run great ever since.

As for TDC, I just rotated the flywheel by hand till one lobe on the cam was at it's apex, then adjusted the opposite valve.



Is that .04" if it is that is a huge gap. Yeah I am going to do mine again tonight after work and take a few more pics. I am going to recommend removing the spark plug as mine you can't budge it in the compression stroke. Thank you for everyone's help I like to make this a good guide for anyone to follow. I'm going to do mine at .004" as almost everything I read says the .002" is for the 50cc GY6.

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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics
PostPosted: Wed Jun 03, 2009 6:42 pm 
RuckinJoe wrote:
TypeR #126 wrote:
You can also double check TDC by looking to see if the timing mark on the flywheel is lined up with the timing ridge on the right side case cover. Good write up Joe!



I looked for marks on the case and could not find any. Do you have or found a picture of what it should look like? That was the one thing that was driving me nuts. Found this..



Not the greatest pic, but this is from the ScootDawg PDF for installing a BB case.

Image

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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics
PostPosted: Wed Jun 03, 2009 7:32 pm 
RuckinJoe wrote:
undertheradar wrote:
I did mine to .04 on both and it's run great ever since.

As for TDC, I just rotated the flywheel by hand till one lobe on the cam was at it's apex, then adjusted the opposite valve.



Is that .04" if it is that is a huge gap. Yeah I am going to do mine again tonight after work and take a few more pics. I am going to recommend removing the spark plug as mine you can't budge it in the compression stroke. Thank you for everyone's help I like to make this a good guide for anyone to follow. I'm going to do mine at .004" as almost everything I read says the .002" is for the 50cc GY6.




Oops...yeah....I meant .004.


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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics
PostPosted: Wed Jun 03, 2009 7:43 pm 
ruckinfockstar wrote:
RuckinJoe wrote:
My other question for anyone out there, what should the valve lash be set at. I read the numbers are between .003 to .006. i will be redoing mine again with the markings in the right place this time, I will try and take pictures of the cam shaft timing marks on my bike if I can. Plus at .005 I still have valve ticking so I'm going to try .004.

a manual i downloaded says .05mm or .00197. i'd just try .002.


Yeah, that's what I found also for the stock cam, .05mm. I actually have mine set quite a bit looser at 0.08 ~ 0.10mm for both intake and exhaust, as that was what was recommended for my head and cam. Probably because it has much more lift and duration. Mine are whisper quite, but I had my whole valve train WPC treated.

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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics -Draft-
PostPosted: Wed Jun 03, 2009 9:03 pm 
Ok I redid my valves and you guys were right, I did not have it at TDC. I took the spark plug out and there was a way to use a socket on the fan through a whole. Set it up like the picture you put up and set the valve lash to .005 since I ride really hard everywhere I go, lol. I tried to take a good picture of the TDC marks on the cam but the frame is in the way. I redo the write up tomorrow. My valves are quite now but I think I need to rejet because it sound rich.

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 Post subject: Re: Adjusting Valves on a GY6 ( How-To) With pics -Draft-
PostPosted: Wed Jun 03, 2009 9:47 pm 
nice guys ! :banger:

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