How to get down the idle on my 57mm TB's?

[mini_me]

They are if you want to take full advantage of the 57's. I have a 2-2 race system, open airbox, early air boot, Gabro chip with advanced ignition and an 03 Mille engine (slightly larger intake valves, higher lift cams). This bike needs a PC3. The fuel pressure regulator just gets the bike running as sweet as possible from the Gabro Chip, before fine tuning with the PC3.

My setup is nearly the same, only I dont have the newr heads. I was told that PC3 wasn't needed with the Gabro chip. Oh well, back to the drawing board.

[vonDutch]

I have a 2-2 race system

Tell me about it. A Harris full TI set forged in the furnaces of hell. Since you left the neighbors chickens still don't lay eggs, although they've grown all their feathers back.

As soon as they arrive I will fit the lot and report back here. I have no problem sharing advanced Tuono information with Falco riders

But plz sneak in here quietly, be sure you're not followed by Araihead or one of the other hooligans

[mini_me]

OK, TPS reads DIAG -1 so this might be related.

Don't wuite know of this explains a faster IDLE speed.

I will set the throttle stop screw at 1/2 to 3/4 from touching the lever and then retry the TPS reading.

IF it is still off I will trun the TPS senser to the correct position.

[Lttlcheeze]

Are the butterflies closing all the way? If not your problem could be the throttle stop. Adjust it so they close completely and re-lock it in place.

If they are closing completely... I dunno, I know more about the mechanical side of things, not the computers.

[BrummyMax]

TPS diag always reads wrong when you have not backed off the idle and throttle stop screws.

[velowood]

The adjustable pressure reg is a nice tweak- it will raise or lower fueling levels across the whole range all at once. You can play with the fueling just a leetle bit at a time.


Also, Marcodarq told me to use it. I'm using an early FP chip in an 03

[BrummyMax]

The adjustable pressure reg is a nice tweak- it will raise or lower fueling levels across the whole range all at once. You can play with the fueling just a leetle bit at a time.


Also, Marcodarq told me to use it. I'm using an early FP chip in an 03

Are those the 48psi fuel pressure chips?

[mini_me]

The TPS sensor read DIAG -1, so today I reset the throttle stop screw according the manual. Now the TPS reads DIAG 0 so this should be fine.

I also checked the TB's for vacuum leaks, as far as I could see all is fine. Still the bike idles at about 1700 RPM with brass screws opened only 1/2 and 1/4 turn.

So I am still hoping that somebody has any idea how to solve this. KZ, Gabro?

[kzmille]

Close the screws more.

[mini_me]

Already tried that, with them fully closed Idle is still very high to my taste. 1500-1600

[kzmille]

If there are no vacuum leaks anywhere the only way air enters is around the throttle plate or through the bypass circuit. Are you sure there are no leaks? I assume you've checked all the hoses. Have you checked the clutch vacuum system to make sure there are no leaks there? If there are no leaks there is no reason not to run it with one bypass screw fully closed and the other adjusted for balance.

Have you used some sort of vacuum gauge to balance?
Have you tried adjusting the trim for best idle?

[mini_me]

I just bought a carbtune which I will use this weekend to balance them. Doubt if this will be usefull at this stage as with both screws shut it still idles to fast.

Havn't used the trimpots yet because I havn't found a good description yet on how to use them. Most people write something in the line of: I just played with them until it ran fine.

[kzmille]

I don't know if you have seen this before or if it will help with your problem but have a look.

http://www.apriliaforum.com/forums/s...57&postcount=4

Unless there is something obviously wrong with the butterflies or bore I still think there must be a vacuum leak somewhere.

[anzacinexile]

I'm with KZ. The only way a motor will run fast is its getting air from somewhere. If it aint the bypass circuits, it must me getting the air from somewhere else.

[mini_me]

I don't know if you have seen this before or if it will help with your problem but have a look.

http://www.apriliaforum.com/forums/s...57&postcount=4

Unless there is something obviously wrong with the butterflies or bore I still think there must be a vacuum leak somewhere.

Thx 4 the link, I already red this one a few times.

I agree on the simple fact that if the TB is indeed not leaking the only air the engine gets is from the tb and the bypass. That is why I think this situation is a bit strange.

Prolly I will be overlooking a leak somewhere eventhough I have doublechecked.