FACTORY CUTS OUT

It does sound like an idle stepper motor problem, the stepper motor is an electrical motor that is controlled by the bikes injection ecu (computer) the ecu commands the motor to extend or retract its plunger this opens or closes an air bleed circuit within the airbox and gives you higher or lower revs at idle/slow speeds, if the plunger becomes fouled/dirty this will interupt the air bleed circuit and cause the bike to cut out, you will find the idle stepper motor on the underside of the air box on the right at the rear (looks like a black bobbin) it is secured by two screws, remove the screws and take out the stepper motor you will see that it is a motor with a plunger and domed tip, examine the plunger tip and remove any deposits of oil, sludge, carbon, or dirt so that it is thoroughly cleaned, now clean out the recess where the plunger goes up into the airbox refit stepper motor and road test.

Please note that cleaning the plunger only addresses the mechanical function of the stepper motor and checking the electrical function is a little more involved.   

 

 

great forum guys keep up the good work 

im almost certain its this but i wont know for 100% until i change it for a new one..

the problem now is the time of the year

if the maindealers havent got one in stock, the whole of italy closes for a month august 1st, then its down to taking a chance on fleabay.  fingers crossed..     jools

 

Not sure, however if it is part of the idle running system, by putting in a new part that might be set slightly differently to the old one, then I would probably get it done.

 

Can anyone offer more info on this?

 

Are you absolutly sure that all the hoses, including the ones that go to the front, are not leaking.  I have a wild thought that the slipper clutch being a diafram type, that uses a vacuum to operate could leak air??????????

 

Stabs in the dark, but everything related to maintaining pressures in the throttle bodies has to be considered as a 'small' leak can have big effects to idling pressures...not 'on the gas' pressures, which would overcome small leaks anyway.

 

You say after having a good thrash on a track, you get this problem, so this could be related to increased heat, which could be affecting quite a lot of things...sealing of TBs to manifold, pipes, could be fuel pressure related, are both hoses good?  Hoses split off to 2 1 way valves, one to the slipper, one to the frapper.....the slipper or the frapper could be leaking??

 

Anyways food for thought!