Guide to adjusting Desmo valves.

10 Апр 2015 | Author: | Комментарии к записи Guide to adjusting Desmo valves. отключены

Valve Adjustment

While page is nested in the 2V side of my (the 900 came first), the principles apply to both the 2V and 4V adjustments.

Here’s some to help the beginning Ducati relate to some theory adjusting the valves on our eccentric If you’re not a mechanic, then you’ll appreciate what mechanic goes through in how to adjust your valves.

Of there are many ways to your valves, the way that I below is one that I find I also confirm my measurements by feeler gauges between the rocker and the shim, which is another (more obvious)

Be sure to go to your local (or ) and get the new HAYNES manual for the 2V bikes from 1991 to This manual includes the and the Monster’s and while not exactly for the FI Monsters and SSs, will be relevant as the engine and valves are the I got one in 1997 and am very impressed it and wish I’d have had it for the 2 prior!

Instead, I’ve pretty learned everything in there on my

Four valve owners can get a from Ducati (people these factory manuals) or Haynes just came out a 4V manual. This new Haynes 4V should be available at Feb 2002.

As far as 2V clearances, I talked to a in 1997/8, and they said the factory’s new valve adjustments are to include all 2V desmo’s. They said that the new valves are much the same as the old ones as far as goes even though are allegedly bimetallic. While the new of 6000 miles and up to .007 on the are extreme, they said up to 3 thou is OK.

And always run the openers at

I recommend 3500-4000 mile and adjust the closers if they’re than .002. But if you spend a lot of at or above redline, you really adjust it down to the no clearance of at or below .001.

Also see the desmo page for a picture of the valve gear.

sure that the cylinder you’re adjusting valves on is at

Measure the unloaded and loaded Please recheck your once you’re done a cylinder. rotate the engine and double check.

In my notes for MBP collets are pics of the valve during a valve adjustment. The shown there are identical to valve adjustment.

The difference call delta (D). difference is also the closer clearance.

Now you subtract 0.02mm D to figure out how much thicker the new shim should be, which call dc, for delta close.

The step is to figure out the adjustment for the shim. The unloaded gap is the opening now you want to subtract .076mm or .10mm (.004) to figure out how thicker the new opener shim be. Let this quantity be do, for delta

Remove the shims that you to adjust, measure them, get new ones to replace them.

A life example:


If you don’t need to adjust closer shim, there be practically no difference between the and unloaded gaps that you above. BUT, also, be able to just turn the shim when you’re the closer rocker arm with the This condition of where you can it but not actually fit a feeler gauge to measure a wider gap or in between the shim and the closing rocker arm is the closer shim is properly

Be sure to take a micrometer you to buy your new shims. Ensure they are not thinner than computed thicknesses. Too thick is OK, as you can them down on sandpaper.

Ducati 350 S Desmo

See the below on checking the closer clearances.

Now, see I use a piece of cylinder to help me check the shim I put the 3/8 x 3/8 roller bearing piece in on top of the valve’s rings sit, measure the total clearance, subtract the height of the stock doing the calculations. Of course, always adds some but that’s part of the mystery in valves. People with 4V will want to run down and buy a small valve shim for stock, and get a 3.00 mm one to make the easier.

The 4V motors have diameter (smaller) valves the 2V motors.

More on checking the shim clearance Some guy me to remind everyone how about the that the half rings get wear. The half rings hold the valve and closer together tend to get dents in and if (when) you put them in upside the closing shim clearance may get tighter. You actually can tell side was up if you look closely at as one side of the half ring be worn on the bottom and the other on the a bit.

You probably should replace at any signs of wear, I do when the is real bad, or if they to break. The 4V people will that the half rings are a tight fit between the valve and shim.

The closer shims may be I check all around with the before installing them. I 0.01mm tolerable, but will any with more wear.

checking your clearance, you rotate the closer shim a bit to make sure that on the highest part of the shim.

double check your before pulling shims and valves!

If you have to force a gauge in, it is too big. Put a feeler in a book and push it in and out. about how it should feel for the proper gap.

Obviously, I can’t be held for anything that you do to your so if you totally follow what I say and up your bike then try to sue me or dumb, I’ll tell the that you’re the fool believed what you saw on the internet. :)

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Ducati 350 S Desmo
Ducati 350 S Desmo
Ducati 350 S Desmo
Ducati 350 S Desmo
Ducati 350 S Desmo


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