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Message started by rocky on 02/05/08 at 16:55:37

Title: valves closed
Post by rocky on 02/05/08 at 16:55:37

When the rocker arms are up on the exhaust and intake is that when the valves are closed ?

Title: Re: valves closed
Post by demin on 02/05/08 at 16:56:21

Yep.But check to make sure it's a TDC so ALL pressure is off of them. ;)

Title: Re: valves closed
Post by rocky on 02/05/08 at 16:57:43

Thank you

Title: Re: valves closed
Post by Savage_Greg on 02/05/08 at 21:24:48

I didn't see anyone mention TDC on the compression stroke.

Do you have a manual?

Do you have a Photo CD?

Title: Re: valves closed
Post by Savage_Rob on 02/06/08 at 05:10:36

Absolutely. Not just TDC, but TDCC!

Title: Re: valves closed
Post by skrapiron on 02/06/08 at 05:21:53

Yes.. What the other guys said! There are TWO top dead centers on the bike.... ( I learned that the hard way when I adjusted my valves the first time.)

You have to make sure that you are at TDC on the compression stroke.

Title: Re: valves closed
Post by Reelthing on 02/06/08 at 06:12:02

just to continue the thought a little - being on the compression stroke is far more important than being exactly at TDC

Title: Re: valves closed
Post by Savage_Greg on 02/06/08 at 06:39:13

Seems like we just went through all this a couple weeks ago...

Title: Re: valves closed
Post by Savage_Rob on 02/06/08 at 10:42:08

Personally, I like the wooden dowel in the sparkplug hole trick.

Title: Re: valves closed
Post by Oldfeller on 02/07/08 at 03:23:50

Personally, I like the plastic soda straw in the spark plug hole trick better, less chance of breaking and leaving something inside the cylinder.

Same idea though, you can watch the valves open & close and think you have TDC on compression properly ID'd

but KNOWING it by watching the straw move out is always better.

Title: Re: valves closed
Post by Savage_Greg on 02/07/08 at 04:02:23

1220372026241E132E23410 wrote:

Personally, I like the wooden dowel in the sparkplug hole trick.

Yep, but the stick or straw (or timing mark) doesn't know the difference in TDC Compression and TDC Exhaust. Therefore you still have to watch the valves move.

If you don't understand that the Intake valves will open and close before TDC Compression, you just might adjust the valves after the Exhaust valves close instead.

Of course, if you are really anal, you could always remove the headcover, set the camshaft position, reinstall the headcover, and then adjust the valves...:P