Ducati Monster Forum

I have an 01 m750 w/ arrow slip on's & open airbox. 
I am having a little bit of trouble in the 3-4000 rpm range. It is very sluggish and misfire's if I try and cruise in that range. sometime's, not all the time, as I accelarate through that range it does it also. I know for  a fact that she is running rich. is this a carb problem?

I also should mention that I do have a minor, minor oil leak at the base of vertical cylinder. it is the gasket on the back end of the engine. Could that be causing a loss of compression.

Other then in the 3-400range she really rides beautiful and I would like it if it was smooth all the way through. I do some city driving it it alsowas make's me dread going at a slow steady pace. any Advice will help. If it does turn out to be the carbs that would be an easy fix if it is because of the richness. I don't know. please help.....

Was it re-jetted when you opened the box? How many miles ago?

Dude, you can't go around with a leaky Ducati  :-\

I have the same moto and would be willing to assist you with it and replace the gasket if you like, have garage, have stands, tools, all that nuts. Or take it to Cheshire Motorsports or Motorcorsa.

Even though a ninja 250 is way different than a monster, I had some issues last year with my carbs that are similar to yours.

I'd say try cleaning them really well, those jets are pretty teeny. If that doesn't do it, like Billy said, try re jetting them and opening up the holes a bit. How many carbs does a 750 have? You can get a sync tool to make sure they are syncing correctly.

I'm not very mechanical, I'm just offering up what we tried last year on my bike. If all else fails, Cheshire will take care of you.  [thumbsup]

I'm not sure if you mean the cylinder base gasket is leaking, but if it is and is causing an air leak that'll definitely cause a sluggish throttle, and midway through your RPM range (about what you're describing) is when a carb has a naturally leaner mixture, which could explain the missing. I'd be curious how you determined that it was rich, if other than smelling the exhaust. I'd assume that opening the airbox would lean you out rather than richen you up. I'd say you were too lean if it's running hotter than before the airbox removal. Could get a good indication by taking a look at the spark plugs. Maybe check if the carb vent hoses somehow became plugged?

A good douche job and perhaps re-jetting should get you on the right track. If that oil leak is the cylinder base gasket, definitely get that replaced. Billy up there is a pimp and will probably accept payment in microbrew.

Carbs?  You want less carbs and more protein.


 ;D

I hate to disagree with a union brother, but fewl injection is for hippies and DeVal people!

And for fat, bald, ugly make the beast with two backss like me thank you very much.  ;D

There is a reasonably good chance you have worn out needles.

WTF, who the hell is this?

We miss you. You should show up more often.

Hey
I'm in the NW, a newbie and have the exact same two problems with exact same bike.  I just rode here (Portland) from Boulder, CO and know that the jetting problem is probably due to the altitude change.  I'm not positive but I'm pretty sure that the leak is from the gasket as I tucked the breather hose up and out of the way (pretty sure about this).
I want to work on both of these things but have never looked inside a carb before and have no idea what I'm doing but would rather not pay someone else to do it because I would like to learn something. 
The gasket also is beyond me so if anyone would be willing to help me, I would be happy to pay someone in cases of microbrew, or most things else really besides heaps of cash (some would not be a problem).
Anyways, new to the area and the bike, would like to meet some other riders.

Welcome to the jungle! We likes our beers here.  ;D

Yes welcome!

Buy your parts, a jet kit, AKG pugs, wires, a tampon for the seepage, whatever you think. I have the same bike and the shop manuals so I'd assist any of both of you if you want. You can bring your sisters over too  :) anyone can.

Hi Toolfan  8)

I don't know if it has been re jetted. I'm the 3rd owner and the previous one had no clue. I'm guessing it does since the air box had already been opened and Slip-on Arrow exhaust installed when I bought it. But I shouldn't assume anything. I am going to get the factory pro Jet kit this weekend and install, i want to take them out and clean them so i might as well, Right. [thumbsup]

It is the gasket at the bottom of the vertical cylinder. One major question; Is it possible to take the cylinder off without removing the whole engine. if not then I'm screwed. At the moment the bike is my primary vehicle to work so it would have to be done over a weekend. :-\


The spark plugs are showing a rich mixture. There not blistered but sooty. The vent hoses are intact. Also I have no problem supplying the Brewski's for some knowlege and know how on these two issue's I'm having. i would preferr it. I've cleaned the carbs before but a little intimadated about jetting the thing. I'm afraid it will run like shit afterward.

I been told that from a couple of the guy's I work with, The rejet should take care of it I hope.


Welcome to the board. You'll find everyone here very helpful, but crazy to. [laugh]
I'm glad to hear I'm not alone with this problem [bang], I be glad to help as I would to would like to learn how to fix the problem rather then send my Baby away and not know what awful things were done to her. Getting to know your way around your bike is a +.  8)

Tailgunner, If you are willing to help out that would be great. PM me when your avaiable.
Julian, we should see if all our schedule's work out and do all at once so we don't waste to much time not riding. [moto]



My sister's are married but if you preferr hustler mag's rather then beer you got. [cheeky]


Thank you all for t he advice, I appreciate the help.

My bike is also my primary and only driver, so I'll probably have to wait for fall/winter for the gasket swap but we should definitely do jetting.  Let me know when and where. 
This sounds good.  Lets drink some beer and work on bikes!

and boobies... never forget the ( . )( . )

These ones are better baby..... (*)(*) ........look familiar?  ;D

Eveyone mocked me when I posted those  . . .

I kinda like Vics (*Y*).  No one mocked him either . . .

You're all mean . . . everyone's always picking on me.  :'(

You do have a yellow cycle.....  :D

Bobbies are great( . )( . ) [thumbsup] but I prefer the booty ( Y ) ;D

Neikos, I liked your perky little (*)(*)....They're great!!!  You're great!   Don't let them give you a hard time.  Tell them to meet you on the playground and you and Lily can get it on like Donkey Kong.   [laugh]

Quit thinkin' about (http://emoticons4u.com/obscene/eck02.gif)

when you should be thinkin' about (http://emoticons4u.com/trans/fahr38.gif)

Flesh colored helmets are awesome!

Hey Jay & Julian,

I have been without a PC at home for a while, was on here while at the office only till now. Did not receive the PM till now, a bit too late. Sorry about that.

I'm definantly willing to assist you guys but the gaskets and all will be some what of a tear down and since these Monsters are your only means of transpo be prepared to quite possibly go without for at least one night... there's a good chance of that.

ps; AKG's are my headphones, NGK's (how'd I mix that up?) are the spark plugs #4339 DCPR8E, these I use on my 2001 M750Dark.

Tailgunner,
   It's no problem, I ended up getting the parts on Thursday but I had absolutly no time this weekend like I thought. I put in Pergo one day and in the cage all day on sunday to watch the Mariner's. Good game, semi-boring since it took 15inngs to see a 2 to 1 winner. [popcorn]
Anyway's I'm thinking next weekend, I hope, will be a little bit easier going. julian wasn't able to get a jet kit this weeked either...( I bought the last one) ;) I'll try and get in touch next Thursday,Friday. We'll all have a better plan of what will be coming up in the Weekend.

Cant wait for you guys to change a base gasket and tell us how long it took. It might motivate me to do something about my base gasket leak. ( 01 M750 Dark )
But after changing the timing belts on the Chrysler 300 Im not so motivated..

[edit] My leak is on the vertical cylinder.

gee i have a base gasket leak on my 2002 M750 as well.

Its just getting worse lately and im tired of cleaning up the oil. Maybe we should have a base gasket fix party?

I'm up for it. [beer]. Is it your horizontal or Vertical?
Mine, of course is the Vertical. I believe I can do it without removing the engine. It will  be diffucult but I'll be putting in a jet kit anyway and will have to remove the the air box and carbs to do that so it will hopefully work to my advantage. :-\

Jay - Wheres your pic from? I think I ...uh... want to get to know ... I mean know that girl... can you send us a bigger version?

its the vertical one, er ahh the one standing up....isnt that like....vertical?

TAILGUNNER/JULIAN,
I have to work both sat. and sun.....Got to make the  [bacon] some how. So a Gasket change is out of the question. I could still get together on sat or sun afternoon to do a jetting job though. IF you guy's don't have time that will be fine I do have a Haynes manuel and Internet to show me the Basic's. PM me if you are still interested. I will bring some beer over, [beer] That beer could be for anyone of you who has experince working on carbs and perferably who has the right tools to do so. ;) ;) ;).

I see that Bacon was added, why don't we have an icon of (*)(*)ies

That is the ultimate question of life, the universe, and everything!  [laugh]

Ahem!!!!! [clap]

I would definitely help you but I'm not a carb tech  :-\ More or less I just get after something and if I can't figure it out I take it to Cheshire.

I'll call you  :)

dont do what i did, break off a jet inside the carb.....

the jets i was working on were made out of soft brass, it was in there pretty good and i twisted it and pop!  quite a sick feeling to know you just broke a jet off like that....only way i got it out was to take it to a friends who had these special bits that drilled into it so we could back it out.

what is wrong with your bike again? i mean how is it running bad so your putting in different jets?  I dont know anything about these carbs, i use to work on an old CB750 which had 4 carbs on it so i always had to dicker with it. I am pretty good at diagnosing bike running rich/lean problems and carbs.

Are you sure its a jetting issue? Whats the symptoms?

Bike: 01 M750, open Air box, highmount arrow exhuast. I will not know until I take the carbs off if it has been jetted before. I have cleaned the carbs out, most recently in feburary, fuel filter change at the same time. The Bike has 16,000 miles on it now. 12,000 when I got it in sept. last year. Not sure when the last time a valve clearance was done and I should do that this weekend.  [thumbsup]
I'm pretty sure it is the carbs. You can smell the fuel if you ride behind me. The Spark plugs tell the damage and I'm only making 33mpg. Overall it runs well, always starts up  good in the mornings, with the choke of course. runs well during the morning with the cold air on the oil cooler. I have a 45 minute ride into work everyday over corneliuis pass and up to st. helens, OR and seems to do fine. Usally in the afternoon, once the engine warms up and only in 3-4000 rpm range I get a lot of backfiring, sluggish accel, just no power, i'm guess that to much fuel is being thrown into the cylinder. As soon as I hit 4000 RPM I'm in good condintion. I'm not a carb man, never dealt with carbs before this bike. But I have been sucessful on all other maintence for the bike. So my hope's are high. ;D


I would faint if that happened to me. Knock on wood. [bang]

so its running rich, i dont know how the ducati carbs work but is there any air/fuel mixture screws to adjust on them? If you havent checked that you might try that first before messing with the jets. Also do they have float bowls on them? Sometimes they get stuck, and the bowls fill up with gas. i had a bike running just like you describe, it would run great in the morning but when it warmed up it would backfire under deceleration, sputter and spit under certain RPM, run sluggish ect. It wasnt the jets, we had to pull that needle out of the carb, the long one that runs down the center and adjust the clip up one notch i beleve if that makes any sense. Someone basically put a 4 into 1 exaust on the bike without adjusting anything on the carb.

Also if i pulled the air filter off the bike, it ran like a top even when it was warm. Gained alot of power as well. That told me the carb was not getting enough air, you can try that as well pull it off and run it around the block, if that takes care of the problem then its not the jets. I dont know a few things to try.

I will try that before I Start installing the kit. Hopfully I might not need to use the kit and be able to take it back. I'll get back to you on how it works.

your plugs are black and sooty right?

Yes i have to change them once a month, so it will fire up correctly.

look at this thread, its from a different forum but its the same problem as yours, alot of great suggestions from some people that dealt with 4 carbs on thier bikes instead of one, so they knew what they were talking about. Same issue you are having....


http://forums.sohc4.net/index.php?topic=8115.0

i was 78_saltlick many moons ago on there.....

Please tell me 78 isn't your birth year . . . I'm really starting to feel old.  :o

Good info but now I feel as if I have know clue what i'm doning. :-\. Well I'm goning to try the simplistic diagnostisc and see what the changing the the setting on the needle will do be before  start tearing everything apart.
i guess i won't tell you my age then.

its good to have a firm base to build on, first make sure your tune up has been done and everything is in spec, then check out the filter thing, make sure the idle adjust screws are right if you have them. then if all esle fails tear apart the carb.

I am 39.... 78 was the year of my bike

Yay!

 ;D

This is well put from this old guy. The vavles should be in spec and probably new wires, plugs, fuel filter, and all the standard necessities to get it right. I have an air filter cleaning kit too.

Damn Salty you're a year+ my senior you old salty dawg  ;)

i know what the hell, it seems like just yesterday i was in my 20's....so how old is everyone on here anyways? 

I'll be 39 in October...

Seriously?  Dude . . . cool.  I'm 39.

21 in 9 daze. ;D

Hogwash. I'm the reigning fetus around here.

I don't know your royalty.

New guy Jay might have you beat.

And wasn't/isn't there some guy that's 18?

good for him at 18 i had a honda twinstar 250

I don't remember the guy's screen name.  We were getting together one night and he said he couldn't join us because he couldn't get in the bar at 18.

I think JBubble is the reigning Female Fetus tho...  yeah, 10/10/69... same day/year as Brett Favre actually... at least I don't look 39... :P

ha... Julie is 05/10/69.

It's a good ... year... yeah, yeah, that's the ticket...  :P

Actually, since I started shaving my head . . . people think I'm younger than I am.  Whereas before people thought I was my dad's twin brother  :o

You're your own grandfather. 8)

oh yeah, i got carded for cigarettes about a week ago    ???

Bastige!  >:(

So is that like 'Sister-Wife' and other Arkansas references? 

(Lord, I apologize for that... blah blah blah... Pigmies in New Guinea)

I'm 24 and will be 25 in Dec..Who is 18, damn lucky to to have parents to buy you a Duc.


Also, I wanted to let everyone know that I'm a Dick, I flaked out on Julian(new member). I feel like shit about doing that to you. I went to work late on Sunday and one of the guy's brought his boat and I skipped out and went wake boarding. I should of called.  :-[..... Such a jackass.

Huh?

You were thinking "I don't get it" right here but you used a new word in place of. Very good  [clap]

Momma Cierra's teaching the boy stuff  [laugh]

i r learnable

Billy, how the hell are you?

Me? I r smat!

Good brother, come out tonight if poss  :) both ya

Ha.  I was wondering what happened.  Its cool though.  I'm only pissed because I want to go wakeboarding. 
Getting pretty anxious to get this done though.  I know my bike can run better than it is and it just kinda pisses me off.

Been moving into a place in the NE so I've been away from the board for a bit but just to update on the general polls, I'm 23 and it is also my vertical cylinder.  What is it with the 750s?  Anyone ever hear about this before? 
I know that the vertical cylinders usually get warmer because of less airflow so I guess it would make sense to have more wear on it.  I guess maybe the stock gaskets are just shoddy.

Anyways, maybe this weekend?  I'm still unemployed (little  [bacon] for me) so I can also do weekdays and/or nights.

i know the 2002 750's are notorious for base gasket leaks, you hear it on the old board all the time. For a while, ducati was just replacing them on the 2002 750's for free even if it was out of warranty it was so bad. It was the gasket they put on i believe, it was defective.  [bang]

Ok start with the low speed circuit adjustment. Actually there is this post from TOB that goes into carb adjusting.

http://www.ducatimonster.org/forums/general-monster-forum/170867-there-how-carb-adjustment.html

or you could try this Carb tuning forum page.

http://www.factorypro.com/tech_tuning_procedures/tuning_carbtune,CV,high_rpm_engines.html

Just for an update.  Jay and I redid the jetting last weekend.  Worked real well for me.  Planning on fine tuning some this weekend.  Need a smaller pilot.

Jerry's like 4'8".  Small enough for you?

Bwaaa haaaaa haaaaaa!

Hey, did Jerry convert over from the DML?