Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > 999 / 749 > Wont start

[smilo006]

999s engine....04/05
Thanks for that.

to check the spart, plug out and start it with the plug against the cylinder head, correct?

If the fuel is getting through wont you see the injectors spraying fuel into the inlets with the tank partially removed? Or is it too fine for that.

I think a list to add to the site would be in order after this.

[Cobbett]

Originally Posted by smilo006

999s engine....04/05

Wrong section then fella. This is 748 to 998. For a 999 you want to post here:

http://www.ducatisportingclub.com/forumdisplay.php?f=84

[antonye]

Thread now moved to the 999/749 section.

[Shazaam!]

Engines need more fuel for a cold start because there is no heat in the ports and chambers to keep the fuel atomized as vapor, so it stays as a liquid. Fuel as a liquid burns very badly in the combustion chamber, so throwing extra fuel at it ensures enough stays as vapor for some sort of combustion. Too much fuel and you foul the plugs.

One of the problems with shower-type injected bikes like the 999 is HOW you start bike can result in problems. You can easily flood or foul plugs with shower injectors because much more of the initial fuel spray from shower injectors condenses on the cold surfaces of the throttle bodies and intake tracts before it can get down into the combustion chamber to aid startup.

So the method of starting is different.

In particular, do not open the throttle or engage the fast idle lever until the engine fires up. You must simply hit the starter button and wait for the engine to come to life. Attempting to crack the throttle open will only force you to run the starter motor longer (and possibly drain the battery). Once the engine begins to idle, you can open the throttle or fast idle lever at any time.

[smilo006]

999s engine which is a 998s engine basically, the rest of the bike is 998 and it is unlikely the problem is with the "metal". moved back

[skidlids]

If its housed in a 998 chassis with a 998 airbox then yes you should be able to see the shower injectors spitting out a bit of fuel as it builds up on the back of the throttle butterflies.
I usually use a spare spark plug rather than remove one from the engine, doesn't need to be the right one so long as the plug cap fits on it or the stick coil if yourusing them

[Ray]

How long ago since it last ran?

If it has been sat for a long time the fuel may have gone off.

My 998 always needs some help in the form of a set of jump leads and fresh fuel to awake from its winter slumbers.

Ray.

[smilo006]

I have tried another tank to see if the pump was not working properly and same result. As stated before it went to alta mura for its wheels to be done I think it was running fine. It was there for about three weeks and the tank off most of the time. They covered the inlet trumpets though. Then cold and damp for a while. So obviously it is holding out for a holiday to Bologna!!

Used a jump lead. Have not got the spark plugs out largely because the Ducati supplied tool does not seem to fit. So will check them.

I should say of course that it is the same engine as the 996R, (bore stroke, compression) except it seems they squeezed a little more HP out of the 999s engine. Other than that it is all 998.

Few more items to add to the list. Possibley moisture in the petrol as neither tank had "fresh petrol". However would image you would get a few splutters out of it at least.

[smilo006]

new relays, voltage tester, changed tanks, changed fuel, changed battery, pulled out fuel pump, checked, checked fuses, etc.........

after each one tried to start it. Nothing. Went away, came back and it just started.

Put it in the garage. Wouldn't start.

********. Then started with voltage meter. Noticed the wiring shroud for the fule pump connector was damaged. Checked this. Brown wire had been solder an the solder had broken......problem found.
Now working beautifully.

[skidlids]

Any idea why it was soldered or who by