s2r 1000 cams

[lilmonster]

I'm doing valve check on 08 S2R 1000. I have not been able to get both opening rockers off to the side to spin the cam with one finger like the videos show. Is it because of a change in design or am I doing something wrong? I have not taken any shims out, they all seem to be in spec. I was just trying to figure things out.

[64duc]

I assume the 1000 is the same as the 900.  Did you remove the spring clip to right side of the rocker? Right side facing the rear of the bike.

[aaronb]

i remember not being able to do that too.  i think it is because of the shape of the head casting.  that is the only difference i could think of. 

[lilmonster]

I had both clips out but the cam would not turn all way around. The cam would move the arms back toward the center and bind against the valve. I didn't put any force on anything but could not figure out how to make it spin.

[aaronb]

i guess i should add that you shouldn't sweat it.  you can still do the valve adjustment just fine. 

[Ivan]

You can't spin the cams on the DS1000 like they show in the video for the other 2V engines.  This is normal.

[wbeck257]

You can't spin the cams on the DS1000 like they show in the video for the other 2V engines.  This is normal.

+1. It had me freaked out too...
But they are diff heads.

[Duck-Stew]

+1. It had me freaked out too...
But they are diff heads.

+1 to the 'this is normal for a DS engine' comments.

[Smokescreen]

This thread has my interest peaked as I've an S2R1K (06) and I've done the valve adjustments and been able to slide the opener-drome.  Is that what you are referring to?

[wbeck257]

No -- go watch the video on youtube where Chris shows how to do the valve adjustment on the 900.
It shows him spinning the whole cam (by the gear) by hand effortlesly, and he speaks of how important that is.

Won't work on a DS motor.

[Smokescreen]

ahh....  I see...  When I've done adjustments on the bike, I've spun the cam via the rear wheel.  I've not been real keen on moving the cam location and risk replacing the belt on the wrong spot.  On the M900, I've used the same method, though at some point I may buy a proper crank turning tool.

The thing is, if you are checking clearance, you have the piston at TDCC and there you wouldn't be spinning the cam then.  And then when you are pulling shims, you only spin the cam far enough to move the Desmodrome aside. 

However, I can think of another reason it might be harder on the DS1K mills, and probably not healthy for them either.  On the 900 mill the cam spins on ball style bearings on either end of the cam.  not so on the DS1K mill.  The cams spin on plain bearings here, and thus need oil pressure to spin well.  Plain bearings, for the uninitiated are the kind of bearings you find holding the crank.  There are no ball bearings, only a polished shaft spinning in an oil pressured race of softer compound metal.  It's a little unnerving at first glance, since there is no obvious reason the thing should spin at all, but in practice, they are lighter, longer legged, and more efficient. 

Still not sure why anyone would think it important to spin the cam, even at BDC, unless it's to "feel out" the roller bearings in the older lumps.  You know, then you'd feel a crackly bit, and know it's time to replace a bearing before it self destructs along with your head, valves, piston........

Is this the reason he gives?  Or does he just claim it's paramount but for no reason?