It's happened again...guide(s) shot

[brad black]

this is what i have done, seems to work well.

http://klineind.com/Valve-Guide-Liner-R-System.html

[chenzo9]

Because it has been hard to start and ocassionally it stalls on me at a stop. So I brought it into Ducati and had it checked and they determined that the guides were bad. Any suggestions?

Vinnie

[chenzo9]

Vinne,
Why do you need the valve guides replaced?

The bike was hard to start and ocassionally stalls at a stop. I brought it into ducati and had it checked. They determined that the guides were bad and it happens to a lot of the new DS motors. Amy suggestions?

[Travman]

Because it has been hard to start and ocassionally it stalls on me at a stop. So I brought it into Ducati and had it checked and they determined that the guides were bad. Any suggestions?

Vinnie

Sorry to hear about your valve guide problems. That's a cool looking bike in your avatar. You should post up some pictures in the "bikes of the DMF" thread. So did you transplant a DS1000 into a 2000 Monster chassis?

[avizpls]

Hmm...they sell 39 and 44mm valves there. What do you suppose one would do with those?

[Speeddog]

Hmm...they sell 39 and 44mm valves there. What do you suppose one would do with those?

Assuming they're 8mm stems, you could pretty much fix the crappy 900 valve seat profile.
Or at least salvage a set of heads.

Ca-Cycleworks has 40/45 sets that would likely enable a complete fix.

[avizpls]

Wow but how much further up in would they be seated? I picture intake vs exhaust valve clashes! Hw doesn't that happen?

What does a good profile look like then? I know the 900s are...shall we say simple, but so bad that you need an extra mm or even two to recut a better shape?

[Speeddog]

I'm pretty sure I've got a set of M900ie heads with cams, still assembled, I'll check how much clearance there is between the valves on overlap.

The OEM seats have a pretty nasty 'step' in them, my cylinder-head guy said it really kills flow at low lifts, and larger valves and cutting the seats to match would help a *lot*.

[jerryz]

Colisbro valve guides are also much superior to standard ducati ones