First Service

[Gnome]

Had my first service today, Dave the service manager at GP Motorcycles where I bought it did the service and allowed me to watch. We completly removed the throttle body and examined it. It has a screw adjustment for overall idle and a butterfly. The injector is seperate and downstream in the intake no external adjustment. The computer is the same make and model as the Ducati his diagnostic computer pluged right in but would not read out. It needs a new card for the Atlantic. He called Aprilia but nothing yet. They will reset a computer a little richer and send it to him. He is confident that the stall problem is to lean a setting. He is also confident either Aprilia or the manufacturer of the diagnostic computer will be supplying the card so it can be remaped by the dealers. New model glitch. We spent 5 hours but I was only charged 2 their labor rate is $60 an hour so the service was $149.14 parts and labor. Best of all I learned a great deal about the scoot. Told you they were great people at GP. They also own the Aprilia/Ducati dealership in Oceanside CA.

[sandiego2]

That's good news. Did you get the impression that this was a problem just with your bike, or do all the Atlantics have this overlean mapping? Do you think this is the cause of the slight backfiring I experience when I chop throttle?

[Gnome]

Yes I think it is on all the Atlantics, Dave said it was common with all the new bikes part of smog testing. It only shows up under the right (er wrong) conditions. I have only had the problem twice a little cool off time and it went away both times were after an extended period of riding on very hot days. For my normal driving it is not a problem. Your backfiring could also be caused by a lean condition. It can be caused by to rich (bang,bang,bang) or to lean (pop,pop,pop). I don't think Dave will let go untill he has the fix, which is easy once he gets the proper equipment. My Ford was also to lean from the factory. The must set them at the maping that they passed the smog tests at, so its common with new Bikes and Cars.

[sandiego2]

Thanks, Gnome. On my bike it's a pop pop pop, so it must be too lean. I've always thought of backfiring in the context of unburned fuel finally burning in the muffler. That presumably isn't happening here. Do you know what is happening, and whether it is damaging anything?

[micah apriliaforum com]

It has to be unburnt fuel presumably caused by an overlean condition....but the pop pop pop will cause no damage to a stock exhaust system. It is an uncommon issue on fi bikes but happens on anything with a carb.

[Taylor]

Aren't these systems fuel injected and not carbs???

I too have had the stalling and the backfiring problems. My dealer adjusted the idle setting, but attributed the problems to the CA emissions system. Any further word on this???

[RGH]

Have your dealer contact aprilia for a possible fix for
the stalling and backfiring problems....