Your bike is a twin spark and your problem sounds like one of the coil caps has/is failing. Has your man checked or replaced these ?
He replaced one after a quick visual and aural test while the bike was running: That's one of the parts I owe him money for if he decides to pursue it.
I was looking at the other side a week or so ago and the plastic packaging has split and the internals are very rusty but my problem has been the same since aound August last year.
Sit Back. The story goes:
I bought the bike in Feb 2010;
I was found to idle anywhere between 1000rpm to 1900rpm, or thereabouts, when stationary at the lights, for example;
I was given the geezers' contact details by a fellow Tosser and went to see him for a throttle balance and idling speed set up;
He immediately questioned me about why I would need this and explained the symptoms;
Geezer plugs his compter into the diagnostics port and tells me I need a new lambda sensor and somebody has tweeked the throttle bodies to compensate for the lambda sensors' poor operation. He shows me the analysers output on his PC and explains what should be there, which I understand fully because I'm quite conversant in square waves and mark/space ratios;
He orders and installs a new lambda sensor, resets the throttle bodies-something along the lines of the equivalent to a carb's sliding piston position-and then sets the TPS voltage;
Fault is still fully apparent;
All of this is accompanied by the fitting of a Y-Piece, and using the original silencer, but the fault was the same as before. He also confirmed that the business of keycoding was confirmed and accurate;
I am sent away and told to run a couple of tanks' of fuel through normal usage and report back. This doesn't take long with me and I report back in a week and tell there is no diffference and that I've also used a bottle of Winn's Dry Fuel in one tank full, and a bottle of Fuel Injection System Cleaner in the other;
He gets me back in and checks the CO emmisions, rechecks the throttle body balancing, changes one coil pack and the TPS and still the bike idles poorly and stalls unless the twist grip is managed manually when the operator hears that the engine is about to die. Mass confusion is now encountered between he and I;
I get sent away again to report back later and do a fuel economy test and run my tank dry. He tells me I should get three hundred miles from my tank (R1150GSA) and I report back that I went to Dorset and Back and recorded 299.9 miles upon my arrival home. I wnet to fill up and only got 25L in the tank so, I still had 5L left by my reckoning. I did do the fill to the brim trick before I set off but do not have a modified tank;
So, I start the bike and have to keep the fast idle lever on the partial opening position until one bar on the RID oil temp display and then have to pay attention, aurally, to the idling for town riding until two or three bars on the RID, but ignore it when straight on to the motorway. But, to reiterate, if I'm doing stop, power down, come back in ten mins, and set off and go again, I have to manage the engine manually because it will not idle at a steady rate.
Bike is overdue for valve clearances but alll that is done is marginally shift the steady idling speed. Air filter and plugs changed in Feb' along with all oils but this is wholly irrelavent and just offered as superfulous information to save you wondering: The bike's been faulty for over a year as decribed above but please feel free to ask any other questions.
Hope this helps, and if you want to see the bike please let me know. I'm on Walkabout from Wed's: Working in West End on Thurs', Spring Tosser Camp Out until Monday, and anything goes after that because I may do your LOA run, when ever it's decided to be done, the West Mids Curry, and Woodsies Blue Bells and Lambs ride out on the 8th but don't tell him 'cos it's a suprise.
So there you go. I'm quite happy to come along, for a paid job to you, and perhaps learn a bit along the way.
The sensor usually isn't the problem but the wiring - it may be worth just rewiring the sensors that are there.
I haven't looked yet but intend on doing so when the opportunity arrives and I suppose that time is rapidly approaching if not to simply answer the questions here.
