Hey guys I have a 99 M750 Dark and ever since I got it it wouldnt hold idle when warming up. I would let it stay at 3000 then maybe a few minutes later I would move the choke down to 2000 and it would die down and kill out. How can this be fixed so it would hold at 2000 rpm when first starting and warm up properly?
Also another problem I have is at 6000 rpm it would start spitting like its redlining but I was told it has a way higher redline then that? I was wondering what couid cause this and how do I fix this?
Should I get the Carb cleaned out or rebuilt?
Quote from: ZeebraX on January 20, 2011, 09:12:41 PM
Hey guys I have a 99 M750 Dark and ever since I got it it wouldnt hold idle when warming up. I would let it stay at 3000 then maybe a few minutes later I would move the choke down to 2000 and it would die down and kill out. How can this be fixed so it would hold at 2000 rpm when first starting and warm up properly?
Also another problem I have is at 6000 rpm it would start spitting like its redlining but I was told it has a way higher redline then that? I was wondering what couid cause this and how do I fix this?
Should I get the Carb cleaned out or rebuilt?
Get a good manual like a Haynes manual if you don't have one. Check out whether the idle speed screw and idle mixture screws are correctly adjusted on your carbs. They may have been incorrectly set by a previous owner. Carb synchronization is another adjustment you may want to try, but that's more involved so set the idle mixture and speed first.
The carb idle mixture screws are very small recessed screws at the bottom of each carb and the idle speed screw is a larger one up between the carbs you access with a long screw driver, a flash light and often with the oil cooler out of the way.
There are threads on this forum and some other sites that will show how to do this. The Ducati Suite and Factory Pro sites are helpful and the search bar on this site may bring up some good thread info.
There may be other reasons for your bike's behaviour but try this first and let us know how you go.
What do your spark plugs look like? White, brown or black?
Actually havent checked. But when I got the bike the previous owner did a major tune up.
On another note. . . .
Its leaking oil from the filter. Could I have over tightened the filter by accident which causes the leak? If so could I just take the filter out and change the filter without takin the oil out?
Quote from: ZeebraX on January 24, 2011, 05:43:56 AM
On another note. . . .
Its leaking oil from the filter. Could I have over tightened the filter by accident which causes the leak? If so could I just take the filter out and change the filter without takin the oil out?
First I would check that it is tight enough. Yes, you could have overtightened it. You can change the filter without draining the oil.
Quote from: ZeebraX on January 24, 2011, 05:43:56 AM
On another note. . . .
Its leaking oil from the filter. Could I have over tightened the filter by accident which causes the leak? If so could I just take the filter out and change the filter without takin the oil out?
If you still have the old filter, check to make sure the rubber gasket came out with it. Sometimes it'll get suck on the motor and cause the new filter to leak
Quote from: ZeebraX on January 20, 2011, 09:12:41 PM
Hey guys I have a 99 M750 Dark and ever since I got it it wouldnt hold idle when warming up. I would let it stay at 3000 then maybe a few minutes later I would move the choke down to 2000 and it would die down and kill out. How can this be fixed so it would hold at 2000 rpm when first starting and warm up properly?
FWIW, I find that when mine gets to that point it will run fine w/o choke. I had a hard time believing it at first (it's been in the 20's here, and my ol' 240Z takes ages to run smooth off choke that low), but it seems to work - at least well enough to let you finish warming it up without the engine screaming away at 3k.
Fixed the leak. Still gonna wait to see if it studders at 6000 rpm when it gets warm. Might have been tuned like that I guess.
Quote from: ZeebraX on January 26, 2011, 04:37:35 AM
Fixed the leak. Still gonna wait to see if it studders at 6000 rpm when it gets warm. Might have been tuned like that I guess.
Nope. FWIW there is no true redline on the carbed monsters. What I am saying is that when they are running correctly there will not be a point where they give a definitive fuel cutoff. They have no computer to perform this process and the fuel and spark are all basically mechanically controlled not electronically. There is no means to implement a fuel cutoff in this system. My 01' 750 would get over 9k but there is no point as power dropoff over 7500-8000 rpms is significant as that is around peak power.
Sounds like your carps are in need of some work as that is typically the issue with sputtering, also, factoring in your idle issues I would say you need to be d
doing some maintenance on the carbs.
There are other possibilities but carbs usually end up being the culprit.