Idles fine with or without choke - cannot increase rpm normally can increase rpm very slowly with or without choke but if give too much gas too quick it dies cleaned carb twice - no dirty jets
Few suggestions(if not checked already):
Holed or incorrectly seated diaphram?
Timing advance?
I Presume you have checked already the air correction and needle jets too.
Please get back to me if you require further asssistance.
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the sequence to throttle adjustment is to adjust to high speed first ( screw closest to the air filter) turn in in or out until it fires evenly at rpm and picks up rpm easily
now hold the throttle at full throttle and slowly idle down while adjusting the idle screw ( closest to the butterfly) to maintain engine running
the screw should have been turned all the way in then back out 1 1/2 turns before starting the engine
keep slowing the engine while making very small adjustment until it idles at rpm slow enough that the chain is not driving
If you get it low but it stalls out , then adjust the throttle stop screw to maintain idle rpm
Correct adjustment is from this point the rpm increases rapidly with out falter ( fine tune high speed screw to achieve that)
and when left to idle will do so evenly without driving the chain
all of this working is depending on the carby having new diaphragms , needle height adjustment correct and the system cleaned out
The idle adjustment is on a small knob under the left side of the fuel tank. Start the bike as you would normally, then turn the knob until the idle speed picks up and slowly work the choke in. Continue making these small adjustments until the choke is all the way in and the bike is idling at a speed that is to your satisfaction. Barring any mechanical problem, this should do the trick.
TAKE THE AIR CLEANER OFF THE INLET MANIFOLD LOOK DOWN THE THROAT AND SEE WHERE THE BUTTERFLY IS SITTING YOU WILL SEE WHERE YOU ADJUST THE IDLE,YOU ADJUST THE IDLE SPEED BY BY TURNING THE STOP PLATE ADJUSTING SCREW TO INCREASE RPM SCREW IN TO DECREASE RPM SCREW OUT__ NOW !!!BE SURE TO ....LOCK THE ADJUSTING SCREW WITH THE LOCKNUT I THINK THAT IS WHERE YOU TROUBLE WILL BE ...
Try a fuel additive to clean the system, also if the airfilter is dirty or damp, this can cause problems. You may even have a rust problem in the barrels. Or even the engine oil may have thickened causing a resistance in the crank bearings, so flush the engines oil ways if other solutions don't work.
sounds like when you say cold you mean very cold. If your choke has variable control on it try using more choke until the motor gets warm. Often times the cold weather causes a leaner condition because the air ppm is so much greater leaving you with a leaner running condition.
Initially, the "choke" in a 2002 Ducati Sport 900 is not really a choke, it is an idle lever that increases the idling slightly above normal. A real choke would enrich the mixture by adding more gas and limiting the air and is performed by the ECU. This conditioned is triggered by the temperature sensors and kicks in only when cold. Corrective action would then be to adjust the idle RPM.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.
hello first check your idle with the car running foot on brake see were your rpm reading is if your below 500rpm check your label underhood for your curb idle setting second see if theres a adjustment screw you can increase were your gas cable lever rest against your set screw underhood if you feel confident enough remove your iac motor idle air control valve if the bore were the end of the pintle extracts out to close has varnish builup our carbon it will stick creating vacuum leak type senario causing stalling rough idle sometimes even no start conditions good luck
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