Continuing Saga of my 2000 M750...

[Javamoose]

Heuuuu  .....the carburetor  has been rebuild ...silly question but ..... is the  idle  adjusted correctly ?  

No idea, I would hope a shop with their own race team would adjust the idle, but who can say.

And if you want to rebuilt it     NRP-carbs.co/shop  model KY-0569N   

If you have a  BDST- mukini 38 mm  here you go.... everything you need in one kit  o-rings, jets...everyting!!!!    I've rebuild mine  this year best mood I've done so far 

http://i1121.photobucket.com/albums/l517/jfran745218/Photos-0055_zpsed018019.jpg
http://i1121.photobucket.com/albums/l517/jfran745218/Photos-0060_zps4988cd9f.jpg

Thanks for the link, looks like a comprehensive kit, though shipping from the UK is a killer.

[ducatigirl100]

Here a photo that I've fond on the net a long time ago  .....  just let the motor idle to normal temperature and adjust the screw whit the green arrow   1/4 of a turn clockwise sould resolve your problem.... well ...
most of it 

[koko64]

Kits from Powerbarn.com. US co.

[Javamoose]

Here a photo that I've fond on the net a long time ago  .....  just let the motor idle to normal temperature and adjust the screw whit the green arrow   1/4 of a turn clockwise sould resolve your problem.... well ...
most of it  

http://i1121.photobucket.com/albums/l517/jfran745218/Screenshot_2013-08-27-20-56-20_zpsa9782743.png

Heh, I have that image saved in my Duc folder too.    Problem is, it won't idle now...

Here, that will hopefully help.

[ducatigirl100]

Heh, I have that image saved in my Duc folder too.    Problem is, it won't idle now...

Here, that will hopefully help.

Do you have the link of the video  ?

[ducpainter]

Do you have the link of the video  ?

Mouse over his post...he has a hot link.

[Javamoose]

Ok, so, I ended up taking it to the only Ducati shop in town (Tucson, AZ) and another $500 later, the bike was running well.  They pulled the carbs off, said it didn't appear that the other shop had opened the carbs since the rubber fell was trashed when they opened them and there was still gunk/varnish in the carbs.  They tore them down completely, ultrasonic cleaned everything, wire cleaned all the needles and inspected everything.  They're saying it's stock needles/jets and that they are not worn.  They tuned, synch'd, and even checked levels with an exhaust gas analyzer - everything was bang on.

So, it's been a month, was riding it a fair amount until constant clutch issues popped up, turns out my MC was going.  I ordered a new one, put it in, bled the system - all is well.  Went to go on a ride just now and it's back to not wanting to idle.  It'll start with the choke, when the idle speeds up, if I cut the choke it'll lope along for a few second and die.  If, before it dies, I touch the throttle at all, it'll die.  It'll stay idling if I just crack the choke.   

Just got off the phone with the Ducati shop and I was told that it's normal for these bikes (funny, when I first got it, it wouldn't do this) as they are cold-blooded.  He said to let it idle until there is heat in the carbs.  I repeated that it'll only stay idling with the choke cracked, and he said not to idle it with the choke on as it'll foul the plugs (no shit).  I asked how I am supposed to warm it up, if it won't idle, his response was that "It's not hard, why don't you come down sometime and I'll give you a lesson" 

I'm out of money to spend on this bike.  I just sunk $1,400 into it and it still isn't running.  Did I just get a total POS or something?

[Howie]

You might have other problems.  How is the fuel filter?  What is the condition of the fuel in the tank?  Is the tank rusty?  That's just for starters.  The shop is correct that your bike is cold blooded with stock jetting and idle mixture adjustment, but I believe it is still pretty warm down where you are.  1/4 to 1/2 choke to start and for a few seconds, no choke for another few and you should be good to go. 

[Speeddog]

Sounds like the slow jets are plugged.
The holes are quite small, doesn't take much swarf to plug one.

[Javamoose]

You might have other problems.  How is the fuel filter?  What is the condition of the fuel in the tank?  Is the tank rusty?  That's just for starters.  The shop is correct that your bike is cold blooded with stock jetting and idle mixture adjustment, but I believe it is still pretty warm down where you are.  1/4 to 1/2 choke to start and for a few seconds, no choke for another few and you should be good to go. 

Fuel filter and all lines are brand new, no kinks in the lines.  No rust in the tank, new epoxy liner done about 2 years ago (and it appears to be holding up fine), it's had 5-6 tanks of fuel run through it since I got it back on the road (it did have a ton of water in the fuel when I dropped it off at the first shop).  Yeah, it was 85*F when I tried to get it running this afternoon.  Plugs are new NGKs that I installed when I got it back from the first shop.

Sounds like the slow jets are plugged.
The holes are quite small, doesn't take much swarf to plug one.

Well, the carbs were just apart and everything was cleaned and inspected, but I guess it's a possibility.  What are the slow jets on these carbs?

[MongoReturns]

I'm suspicious it started running like crap again when you solved your clutch issues.

Cold or not, I start with about 1/4 choke then ease it back till I get to around 1100 rpm's.  Otherwise it'll run on one cyl for second and die.  I ride it for about 10 minutes like this if I have to stop soon, otherwise I turn the choke off as I'm rolling.  However regardless of choke position the rpm's always get higher if I hit the throttle.

Stage 2 jet kit, stock everything else (in the carb), nearing 25k.

[Javamoose]

I'm suspicious it started running like crap again when you solved your clutch issues.

Cold or not, I start with about 1/4 choke then ease it back till I get to around 1100 rpm's.  Otherwise it'll run on one cyl for second and die.  I ride it for about 10 minutes like this if I have to stop soon, otherwise I turn the choke off as I'm rolling.  However regardless of choke position the rpm's always get higher if I hit the throttle.

Stage 2 jet kit, stock everything else (in the carb), nearing 25k.

It sounds like a thumper when it's idling, before it dies.  But, steady pulses coming out of both exhausts, I checked.  As I type this, I just realized that there is a cross pipe in there...so, yeah, I'm an idiot.

It'll start and idle fine with 1/4-1/2 choke, for a few seconds, until the RPMs surge - then I can drop it back to just a touch of choke (1/8 maybe?) and it will stay idling.  But, if I kill the choke, it dies.  Back before it sat, before all the trouble, I used to start it with choke until the RPMs surge, then cut the choke and it would idle all by itself just fine.  I would smoke a pre-ride cig (so, about 3 minutes) then ride off.  You would think it would work this well after pouring all this money into getting everything changed, refreshed and cleaned.   

[koko64]

Now is a good time to take a look at the plugs again to see if they say anything.

[MongoReturns]

Just listened to your vid, yep thumping on one cyl for a bit - mine does this too until it's very warmed up.  I know I'm not supposed to ride with the choke on, but if I don't it barely idles and hitting the gas results in sneezes out of the airbox.  I can tell it's time to turn it off when it starts missing when I accelerate.  Speaking of, have you checked your air filter lately?

I've always figured (I've rode the thing for a couple years with the above problem) it's emulsion tubes, slow jets, or whatnot but it doesn't really bother me.

Any carb guys think the mix screws should be messed with?  I haven't adjusted mine in a couple years.  Yours might still have the metal plugs covering the actual screws.  Also maybe float level.

[MongoReturns]

And something easy I forgot to mention - couple years ago I was having some starting problems, and tried to find a can of starter fluid - is that stuff not sold anymore?  Anyway a car shop down the street gave me a can of Valvoline Throttle Body Cleaner, the pro will-kill-you crap.  Hosed that into the carb intakes, let sit for a bit, started right up and has been fine since.