Carb servicing time! - Success!!!!!!!

the_Journeyman · January 17, 2011, 08:20:52 AM

Ok, as I re-work my M750, it's in dire need of needle jets. I'm going to pick them up from CA Cycleworks. However, I see he also has a 37.5 pilot listed. That got me thinking. I'm running stock airbox, w/ snorkels, and Termignoni mufflers w/ wrapped core.

Any need to fiddle with main jet size or anything like that? I've not been in the carbs, so I'm assuming they're stock. She was running pretty rich, only getting about 35mpg.

I'm also planning on pulling the hose that goes from the airbox to the canister and to the crankcase vent. I'll stick a little filter thingy to replace the hose.

Suggestions?

JM

ducpainter · January 17, 2011, 08:26:26 AM

I wouldn't change anything but the needle jets unless you were planning on opening up the airbox and doing a jet kit.

Worn needle jets will kill mileage.

koko64 · January 17, 2011, 02:08:14 PM

+1
Consider Factory Pro stainless steel needle jets (if they still make them). They should give good wear with your stock needles which are fat enough to not wriggle around too much and contibute to wear.

Factory Pro say a 14mm float level should be used. I think the Ducati Suite site and FP sites cover how to do this. The float levels are often out from the factory. A search for DMF threads about this should also bring something up.

When the carbs are apart, the obligatory clean with carb cleaner, there's often a lot of gum, dirt and varnish deposits.
Oh, and watch out for the little o-ring under the carb top that wants to hide when you take the top off! The little buggers.

Cheers

Speeddog · January 17, 2011, 02:14:54 PM

Change the float valve O-rings while you're in there.

ducpainter · January 17, 2011, 03:22:16 PM

Quote from: Speeddog on January 17, 2011, 02:14:54 PM
Change the float valve O-rings while you're in there.

...and also the ones on the mains while you have them out to replace the needle jets.

the_Journeyman · January 17, 2011, 03:49:58 PM

Where do I find/order those o-rings from? I'm sure one of our sponsors carry them.

JM

koko64 · January 17, 2011, 03:57:46 PM

Cal Cycleworks sells them. I guess some dealers would have them also.

the_Journeyman · March 06, 2011, 02:08:30 PM

So, I'll need this:

http://www.ca-cycleworks.com/factory-pro-needle-jets-sold-each

and this:

http://www.ca-cycleworks.com/ca-cycleworks-this-is-the-scarce-main-jet-o-ring-for-ducati-mikuni-cv-carbs-sold-each-recommended-to-be-purchased-with-jet-kits-factory-brand-jet-kits

Ca doesn't carry the float valve o-ring.

JM

ducpainter · March 06, 2011, 02:12:15 PM

Did you remove the float valve?

koko64 · March 06, 2011, 02:51:09 PM

How's that carb rebuild going?

the_Journeyman · March 06, 2011, 03:28:38 PM

Quote from: ducpainter on March 06, 2011, 02:12:15 PM
Did you remove the float valve?

No, I've not even pulled the carbs off yet. That will happen this coming week. Really, I just plan on opening the carbs swapping the needle jet and required parts and putting it back together. The bike is mostly stock. It's got Termignoni mufflers instead of stock, and the air filter has been swapped to a oiled-element type. I think it's BCM maybe. It is not a K & N.

Quote from: koko64 on March 06, 2011, 02:51:09 PM
How's that carb rebuild going?

As of yet, it's not even started. Been doing a bunch of other stuff first.

JM

ducpainter · March 06, 2011, 03:31:28 PM

Quote from: the_Journeyman on March 06, 2011, 03:28:38 PM
No, I've not even pulled the carbs off yet. That will happen this coming week. Really, I just plan on opening the carbs swapping the needle jet and required parts and putting it back together. The bike is mostly stock. It's got Termignoni mufflers instead of stock, and the air filter has been swapped to a oiled-element type. I think it's BCM maybe. It is not a K & N.

As of yet, it's not even started. Been doing a bunch of other stuff first.

JM

You should replace the main jet o-rings as they are known to crack when they're pulled out of the emulsion tube.

I wouldn't worry about the float valve o-ring.

It's probably a BMC filter.

the_Journeyman · March 06, 2011, 03:40:20 PM

Sounds good. Gonna go place an order with Ca-Cycleworks. I'm looking forward to this thing running like it should, without hesitation when I roll on the throttle!

JM

the_Journeyman · March 11, 2011, 05:04:14 PM

Ok. Emulsion tubes are here along with new main jet o-rings. I've never been in the carbs for a Duc before. Are there any surprises I'm going to encounter? Seems fairly simple, but I can't see the emulsification tube on the parts fiche. I know where it should be, so finding it shouldn't be a problem I'm thinking.

JM

ducpainter · March 12, 2011, 04:33:43 AM

Easiest explanation is the main jet pushes into it.

Remove the retainer for the jet remove the jet, and then push the needle jet/emulsion tube up towards the slide. You have to remove the vacuum diaphragm/slide to change the tube.

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Carb servicing time! - Success!!!!!!!