[Ducati] NDC- possible carb issues with CCM? Help please

[mike major]

I used to put my 750 Yamaha petcock in the reserve position because it
wasn't dependable under heavy loads, like the old fashoned vacume operated
windishield wipers it tended to close at the worst possible time.  Moonbeam

On 10/2/07, Ronald Betts <ronaldebettsasalc0015 at hotmail.com> wrote:
>
>
>
> Garth, use a hand vacume pump on the vacume line to the petcock. Draw a
> vacume and take her for a ride. I remember some time back my GPZ had the
> same type of vacume petcock and I was experiencing what you described.
> Turned out that the vacume line had small orifice in the hose and it had
> plugged up just enough that when I was on the throttle for a period of time
> I would run out of gas. Pulled out the little orifice and cleaned the line
> and had no further problem. Still don't know why they put that orifice in
> the line.
>
> Peace...Ron"Desmohead"Betts 95 900 SPI've learned that I don't suffer from
> insanity, I enjoy it!> Date: Mon, 1 Oct 2007 16:33:06 -0500> From:
> garthfw at gmail.com> To: ducati at ducati.net> Subject: Re: [Ducati] NDC-
> possible carb issues with CCM? Help please> > Rich,> > I'll check all of the
> vacuum routing, but I don't think that much has> changed. I've removed the
> carb several times to clean and inspect, usually> with nothing much going on
> inside. I've not changed any jetting whatsoever> and the bike ran fine
> before I started fiddling with things. For that> matter, A/F screw is in the
> same position it's been the whole time (now,> after I returned it to what it
> was).> > So, all jets are the same. Hose routing is generally clear without
> kinks.> Carb is clean internally.> > This is a typical petcock/vacuum fuel
> delivery-type setup and it starts and> initially runs fine.> > Again, any
> suggestions are appreciated!> > Garth> > On 10/1/07, Rich Roberts <
> bigredxrunner at yahoo.com> wrote:> >> > Hmmmmm, these sorts of things can be
> so many causes, but my focus would be> > the carb, how is breather on bowl
> routed? how does fuel get from tank to> > bowl? Vacuum style petcock? Pump?
> Is all of that in order? When you pull> > carbs what do you do? I ask
> because I have a DRZ400SM and the slow jet has a> > real tendency to clog,
> also the original location of vaccum for petcock was> > sorry routing and it
> would pinch and you would lose vacuum to petcock> > erratically which will
> eventually cut off fuel flow. I ended up rerouting> > entirely and after
> running kehein CRs and Yosh ti pipe sold all and went> > back and rejetted
> the stock carb with much success. Do not forget slow jets> > have a huge
> imact on jetting that is often overlooked as jets somewhat> > overlap. a
> poorly chosen slow jet can cause top end issues. I saw this on a> > NSR 250
> years ago, mains, needles nothing would correct the fact it just> > would
> not pull in high gear, it would fall flat on its face, upsized the> > slow
> jet> > and miraculous recovery. Also some of these small jets are esp
> sensitive> > to the minutest of crap. I cleaned the original slow jet on the
> DRZ a number> > of times, each time it would be fine for awhile and
> then....same symptom.> > starting problematic needing excessive choke,
> throttle response sucks etc> > etc. So the point, look at carbs closely,
> clean them out well. granted pilot> > air screw can have a profound effect
> esp if slow jet is right size. if not> > the air screw will just be crap to
> crap or little to no effect. get it close> > and you will see the effect in
> and out. Also sometimes you have a couople of> > jet options, depends on how
> many turns of the air screw you make, esp if> > sizes in 2.5 increments
> like you find on some small jets.> >> >> *****> > Our newest sponsor, MC
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