WFO
When in doubt, gas it!
- Joined
- Jun 11, 2007
- Location
- Santa Cruz Mountains
- Moto(s)
- '12 Ducati Multi, '10 KTM 690 Enduro R, '10 Husaberg FE570
- Name
- Gerhard
So I decided to check the valves on my 690. It's pretty easy to do.
The intake valve on the lower right was a little tight at .06mm.
I wasn't too crazy about the scoring on the exhaust rocker bearing and cam lobe.
The rockers come out very easily.
I took the rocker arm with me when I got the new shim for the tight valve.
The guy at the shop in Mountain View gave me a deer in the headlights look when I asked him about the wear. Then I went to Engines Only. Frank said the wear didn't look too bad, but why not spend the dough for a new one if it buys you insurance against future catastrophic engine failure. He also said the bearing, while having axial play, didn't have much radial play to speak of, so he kind of shrugged saying it was basically a crap shoot. So then I went to Moore & Sons and talked to Tom. He said if I bought a new one, the wear would show up again and it was no big deal.
So I'm gonna put it back together and check it again in January before the Baja ride.
Incidentally, the best video I saw on the subject was a YouTube video of this German guy doing a valve adjustment on a KTM690SMC. (if you can get past the German language issue) He uses a punch to stake the pins that the bearings ride on at 8:15. (Unfortunately, the shot of this particular procedure isn't very good.)
[YouTube]5aJHeuAKVT0[/YouTube]
https://www.youtube.com/watch?v=5aJHeuAKVT0
The intake valve on the lower right was a little tight at .06mm.
I wasn't too crazy about the scoring on the exhaust rocker bearing and cam lobe.
The rockers come out very easily.
I took the rocker arm with me when I got the new shim for the tight valve.
The guy at the shop in Mountain View gave me a deer in the headlights look when I asked him about the wear. Then I went to Engines Only. Frank said the wear didn't look too bad, but why not spend the dough for a new one if it buys you insurance against future catastrophic engine failure. He also said the bearing, while having axial play, didn't have much radial play to speak of, so he kind of shrugged saying it was basically a crap shoot. So then I went to Moore & Sons and talked to Tom. He said if I bought a new one, the wear would show up again and it was no big deal.
So I'm gonna put it back together and check it again in January before the Baja ride.
Incidentally, the best video I saw on the subject was a YouTube video of this German guy doing a valve adjustment on a KTM690SMC. (if you can get past the German language issue) He uses a punch to stake the pins that the bearings ride on at 8:15. (Unfortunately, the shot of this particular procedure isn't very good.)
[YouTube]5aJHeuAKVT0[/YouTube]
https://www.youtube.com/watch?v=5aJHeuAKVT0