are my valves clapping ?

[tocoo]

When I start the scooter, I hear a lot of clapping but I doubt myself. Let me know form this video. I set them to 0,10mm like the manual says.

www23.zippyshare.com/v/IFvMSreH/file.html

What are the risks of riding with the valves too open ?

[90GTVert]

That sounds really loud in the video. First I'd take that valve cover back off and double check the settings. You don't have to loosen anything. Just get the marks to align and use your feeler gauges to make sure the valves are set where you intended to. I set mine to 0.002"in/0.0025-0.003"ex usually... something like 0.05mm in/0.07mm ex.

49ccscoot.proboards.com/thread/428/valve-adjustment

[tocoo]

Yes the clapping sound hurts my ears. It is not nice at all.

I struggle to get my valves apparently. THe last time I did them was perhaps 1500km ago and 2 days ago when I checked them, they were tight, the space being below 0,10mm which is contrary to the manual.

I open the valve cover and then I turn the fly wheel to TDC with the T mark on the fixed metal mark. I leave the spark plug IN. When it gets hard to turn the flywheel, At the valves, I hear like a gaz is leaking from a spray can.

I remove the valve cover and set the two valves to 0,10mm like in the manual and liek I did last time.TO do this I put the 0,10mm file behind the tit, then I lock up the tit and lock the nut, then I unscrew the tit a bit and lock the nut for good. I verify that the 0,15mm file does not pass, like the manual says and I check the 0,10mm has a drag when passing the file.

I do a revolution of the fly wheel to get back at the TDC point again. SOmetimes, at this point, my valves are not set. For instance a valve can become loose and the 0,15mm file can pass. SOmetimes one of them becomes tight after the revolution for the control. SOmetimes they do not move.
I remember that THe last time I set the valves, the clapping was present, contrary to the stock setting, but I decided to ride it and then I was used to this sound.

[tocoo]

I found a guide online which state to turn twice the flywheel in order to control the clearance. THe first turn must lead to no room at the valve and the second turn gets back to the set clearance and it is this time to check.
Somehow I did only 1 turn or too many.

[90GTVert]

If you pay attention to the markings on the flywheel and the cam, you shouldn't have to worry about any amount of revolutions. They only align on the correct TDC for adjustment because the cam turns and 1/2 crank speed.

[humanshield]

What the post above said.  Forget the revolutions and rely on the marks instead.

Your video is on a site in the Netherlands. Recent news says never ever open links to servers in the Netherlands.....

Why is that?

But your valves would have to be very loose for a lot of loud noise.

When you have them adjusted properly yo can JUST BARELY feel them move with your fingers. BARELY.
I got to a point where I didn't need a spanner and could always get them right on the mark

[Moat]

I think tocoo simply may have made the mistake of setting clearance with the engine at TDC of the exhaust stroke (with cam lobes on overlap & valves slightly open), instead of TDC of the compression stroke. I.e. - cam was 180° off.

Maybe...

Bob

[tocoo]

THe T mark on the flywheel would be the same for both TDC, but at the cam with the two holes parallel to the cover and the big hole at the top means only ''TDC of the compression stroke'' ?

On the kisbee, there is no big hole, only two nuts



perhaps I confused the two since the position of the nuts seems to be identical at the two TDC

[GrumpyUnk]

The two nuts appear to be mirror images if the cam is rotated 180, HOWEVER, the two small holes that are even with the valve cover gasket sealing surface may not be.
Watch the intake valve rocker arm as you rotate the crankshaft. It should depress and come back up as you totate. That it was opened indicates the INTAKE stroke, which will be followed by the compression stroke, as the crankshaft rotates to TDC. Once the piston is at TDC(this time on compression), the holes will line up as in the drawing, and the "T" mark should align with the metal rib. Set the clearance.
The intake and exhaust clearances are almost so minimal they are barely perceptible when at TDC and the rockers moved back and forth. You should feel just a small bit of motion. If you feel NO movement, they are likely too closely adjusted and should be checked.
tom