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Discussion Starter #1
I have a few track days comming up and want to use my 748 that i purchased a few days ago, problem is i need to know if the valve clearance is ok? or will the engine blow up, they are on the loose side so i'm guessing that is good compared to too tight,
here are the specs

vertical: exh op .007 closing .004 intake op .005 closing .0045
op .008 closing .004 op .005 closing .0065

horizontal exh op .005 closing .001 intake op .0055 closing .0045
.006 closing .0055 op .0055 closing .0045

so what do you think.....


thanks for your help
 

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Discussion Starter #3
first post is a bit confusing... this should be better


Vertical .........................................

exh op .007 closing .004 and op .008 closing .004

intake op .005 closing .0045 and op .005 closing .0065


horizontal ...............................

exh op .005 closing .001 and op .006 closing .0055

intake op .0055 closing .0045 and .0055 closing .0045
 

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i would sand down the horiz. exh closer to widen the clearance to 4 thou or so...the rest are good imho.
+1

I like to keep my openers close to 0.005 and my openers close to 0.007. You are right in the ball park except for that one tight closer.
 

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While you were checking your valves, you HAVE looked at the condition of the rockers? For my old 748, I would adjust the 1 closer, and "run-it" as long as the rockers are clean and no chrome flaking.

But I replaced more rockers on my 748/890 than my 888, 916, 996 combined.
So with any 748 I check the rockers closely........
Enjoy your track day!!

Cheers,
Mark
 

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The range is pretty simple:

.006 - .005 or openers
.004 - .003 for closers

You don't wanna go looser then that, and you really don't wanna go tighter either. The Ducati service manuals are incorrect about how to set them. You really want it to be tight on the 748, don't leave much of a gap, this will help prevent major rocker vibrations and wear that comes from that.

I've done TUNS of desmoquattro's, and had much success with those numbers above, who were given too me from another Ducati service tech.



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Discussion Starter #7
The range is pretty simple:

.006 - .005 or openers
.004 - .003 for closers

.006 for exhaust openers and .005 for intakre openers
and .004 exh closers and .003 int closers??

can i ride it safe this way for e few track days t'ill the season ends

thanks
 

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Discussion Starter #9
You can run all the closers the same. Ducati suggests running the exhaust closers differently, but you don't have to. My 848 has never run better since I tightened up the closers...

so would you run it as is for a few track days?
or do i have to go over everything now
 

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so would you run it as is for a few track days?
or do i have to go over everything now
according to haynes manual:
intake
opening rocker clearance........002-.007"
closer rocker clearance ..........006-.010"

exhaust
opener rocker clearance.........002-.009"
closer ..................................004-.008"

except for that one tight closing shim you're fine.
the clearances arent optimally set (tye's numbers are good to shoot for when you get around to doing the valves), but you wont damage your bike if you run it this way for a couple of months
 
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