Re: [DucatiST] ST3 - first valve check

MBP retainers were developed when the desmoquattro motors first came out.  During racing conditions the stock half rings would break and eventually the motor would blow up as the valve dropped and contacted the piston.  Guy Martin, a fellow in Canada, came up with the idea of a different design for the half rings.  They are precision machined and made of a much harder material (A2 Tool Steel) than the stock half rings.  They also fill the gap between the groove in the valve stem and the closer shim and provide much more contact area.  The results are a tighter fit, less deformation, and less micromotion during use, that extends the valve adjustment intervals. 

 

When used on the 4V and 3V motors, modified opener shims are needed to replace the stock opener shims.  These "modified" shims have a counterbore in the bottom of the shim to make room for the MBP retainer, as it sits up past the groove in the valve stem.  For more info and pics of the MBP retainers for 7 mm and 8 mm valve stems see the products section of www.emsduc.com

 

Mike

99 ST4

 

www.emsduc.com
916-996-7185

 

In a message dated 3/1/2012 9:05:03 A.M. Pacific Standard Time, martimus999@gmail.com writes:

 

What's a MBP keeper and what is the advantage of using them?

Thanks,

Marty

2001 ST2

On Mar 1, 2012, at 7:48 AM, <doghaus@rivernet.net> wrote:

 

Get the factory manual from www.ducnu.something

If they have it, it is a copy of a copy but it is still useful and costs about $5 to download. Yes, this is a copywrite violation.

Dave G

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Subject: Re: [DucatiST] ST3 - first valve check
Date: Thu, 1 Mar 2012 06:16:38 -0500
From: Jack Ward <jaxn51@gmail.com>
To: st2_owners@yahoogroups.com
Reply-To: st2_owners@yahoogroups.com

 

Get the factory service manual from a dealer. It is on CD.

On Mar 1, 2012 1:22 AM, "HOPPER ELDRIDGE" <hoppereldridge@sbcglobal.net> wrote:

 

 

A case of beer would be a good start.....then...   See if Pro Italia still has the video that shows the way to do the valve adjustment. They show a few nice tricks. Also go to Ca Cycleworks in the tech section and Chris Kelley has a good video on the subject. Get a good digital 0-1"/25mm micrometer so you can measure in mm or get a calculater to do some converting. Get the turning tool with "arms" so that you can rotate the crankshaft easily. You will also need the two "measuring" tools to measure the closing shims.   Make a device to plug the oil return hole and make it so that you will not forget to pull it out of the hole before you buckle up the bike. I have a bolt that I put a wire through the safety holes so that the the wire is in the way if you put the covers back on before removing them. The plug keeps the keepers out of the bowels of the engine...never to be seen again.   Make a wedge from a wooden handle "tooth brush", maybe 3 inches long, It will hold the rocker arm in place.   Get a heavy piece of wire...welding rod would do and put a slight bend in it so that it will fit in the spark plug hole and then hold the valve in place when the keepers are pulled off the stem. I then use a bungie cord to hold it in place. Get a scribe with a magnet on the end and that will make getting the keepers off the stem and hold them a whole lot easier.   Also I would highly suggest you get the MBP keepers and put them in while you're adjusting your valves. They will post pone your future valve adjustings.   Have a note pad to write down the figures and do your math. Keep it all systematic and laid out so you can keep your place. One shim can be used on another valve. With good notes, you will keep the number of new shims needed to a minimum. Also get a flat whetstone so you can lap in a shim to a closer tolerance..or a sheet of emery cloth on a pane of glass or granite surface.   And don't forget the beer...Hopper     --- On Wed, 2/29/12, Jerry Duke <jerry.duke@gmail.com> wrote: From: Jerry Duke <jerry.duke@gmail.com> Subject: [DucatiST] ST3 - first valve check To: st2_owners@yahoogroups.com Date: Wednesday, February 29, 2012, 4:33 PM   Hello, I'm new to Ducati, been on BMW's for 30 years. I just bought a beautiful 07 ST3 and plan to do all the maintenance myself. I've done valve adjustments for years but want to make sure I understand everything before attempting my first. What can you tell me or where can I go to get info so I'm comfortable doing this? I have LT's repair manual and got all the parts from Omaha Ducati and am not in any hurry. Suggestions please. Thanks, Jerry Duke Savannah, GA