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Checking valve clearance- TDC or not
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GDMFSOB
 
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Checking valve clearance- TDC or not - February 9, 2013, 08:07 AM

The back story:
Amongst other winter projects on the track whore, I needed to replace the starter clutch. No big deal except it is on back order. The big deal is that the timing marks are on the starter clutch case and I tossed it. Stupid, I know but I figured I have a new one coming
So, part of the winter refresh is to check valve clearance. Since the timing marks are on a part I no longer have, I cant find TDC. Now the question is this: Does it have to be at TDC? As long as the cam lobe is pointing away from the bucket then there is no tension on the valve stem and a valve is closed for 3 out of 4 strokes anyway (in general terms).
I would think that as long as I am measuring between the Base Circle and shim it would be accurate regardless of which position the piston was in. Obviously, I would have to measure before the Lash Ramp or Closing Ramp portions of the cam so it would have to be between 85* and 95* from the plane of the bucket in pic below. Am I missing something, or can you check them this way?


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February 9, 2013, 09:57 AM

As long as the base of the cam that you're checking is against the bucket you're fine. It doesn't have to be exact.

In other words - If the peak of the lobe is pointing away from the valve by at least 90 degrees you're close enough.


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Last edited by windblown; February 9, 2013 at 10:01 AM..
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February 9, 2013, 10:00 AM

On my R6 TDC has the lobes at a 45 degree angle pointing away from each other. Also there should be marks on uyour cam gears that will line up with the cylinder head to let you know where TDC is.

I hope that helps and/or someone that has Kawi specific knowledge can chime in.


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February 9, 2013, 10:18 AM

Quote:
Originally Posted by windblown View Post
As long as the base of the cam that you're checking is against the bucket you're fine. It doesn't have to be exact.

In other words - If the peak of the lobe is pointing away from the valve by at least 90 degrees you're close enough.
This is how we checked them on the 10 last year. I was told that as long as the lobes were pointed mostly away from the valve, you're good.


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February 9, 2013, 02:01 PM

Quote:
Originally Posted by windblown View Post
As long as the base of the cam that you're checking is against the bucket you're fine. It doesn't have to be exact.

In other words - If the peak of the lobe is pointing away from the valve by at least 90 degrees you're close enough.
Thats what I figured. I'm just usually one of those people that follows the FSM to a T. Now, if I had to remove the cam to replace the shim I would want it as the manual states. Hopefully, I don't have to do that.
Quote:
Originally Posted by Jshep View Post
On my R6 TDC has the lobes at a 45 degree angle pointing away from each other. Also there should be marks on uyour cam gears that will line up with the cylinder head to let you know where TDC is.

I hope that helps and/or someone that has Kawi specific knowledge can chime in.
Didn't think abouit the cam gears, thanks!
As an added note, the Kaw indicates that at one mark you can check the exhaust valves on cyl 2 and 4 and intake on 1 and 3. Then you spin it to the next mark to do the rest (or something like that).
Quote:
Originally Posted by RileysDad View Post
This is how we checked them on the 10 last year. I was told that as long as the lobes were pointed mostly away from the valve, you're good.
I'm not even going to mention where that motor is now
































Just kidding, I know it is an unrelated problem































.


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February 9, 2013, 02:06 PM

why not just look in the book? not all bikes are the same. no way i would guess or take a guess from someone else.
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February 9, 2013, 02:38 PM

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Originally Posted by The Evil Twin View Post
the timing marks are on the starter clutch case and I tossed it. Stupid, I know but I figured I have a new one coming
Quote:
Originally Posted by 1is2many View Post
why not just look in the book? not all bikes are the same. no way i would guess or take a guess from someone else.
I did. The part that I need and has the marks to do it by the book is in the landfill It is just going to take a little longer. In my exp, the only reason for putting the crank in a specific position is that it gives you the most valves unloaded at one time. If the lobe is up, the valve is seated no matter the position (TDC/ BDC) of the piston. I figured I was correct, just wanted to confirm.


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