Re: 749/999 stalling poll (Ducatian)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ducatian »
</TD></TR><TR><TD CLASS="quote">Alright, this has been bugging me for a while. My 749 runs great except it stalls once in a while. Who else's is doing the same thing?
Here is the fix:
remove access plugs on the LH side of the airbox (there are two)
Loosen the screws holding the airbox lid on so you can pry open the back of the airbox about 1/2"
Once the airbox is pried open you will be able to see the throttle linkage on the rear throttle body.
There is a 4mm allen set screw for idle speed that points upward toward the LH lower corner on the top of the airbox. Drill a hole so you can adjust this.
Set the air bypass screws all the way in.
Connect vacume balancing guage to the ports on the intakes.
Start motor (it won't want to idle)
Balance TB's with the balance linkage inside the big access port in the airbox.
Set the bypass screws at 3/4 of a turn out.
The bike should be idling at about 1200rpm's
Shut the motor off
Connect the Mathesis to read TPS setting
Back off the idle setting untill there is a gap between the set screw and the tab that it effects (zero idle preload)
What does the TPS read? If it reads zero you will need to wind in the set screw till it treads 2.8+ deg and then re-set the TPS. Now wind the idle back out again.
So now you have a TPS reading of .5+ or so (as long as it's above zero). And the set screw is not touching the linkage.
Take whatever the TPS reading is and add 2.3deg. So if it read .5 and you add 2.3 you come up with 2.8. Wind the set screw in till it reads 2.8deg. Then re-set the TPS. It will ow be assigned a value of 2.3 and you actualy have 2.3 deg on the trottle blades.
Set the trimmer at +20 (this is a starting point for CO's)
Play with the air screws till the idle is 1200RPM (the screws should never be more than 1 1/4 turns out).
Recheck balance, TPS setting, CO's
I think this covers it, does it make sense?