- Wed Jan 13, 2016 11:58 am
#54203
Dean: it is true - it will definitely improve as the engine runs in. HOWEVER, you don't need to put up with it. Just unscrew that big slotted brass screw towards to upper rear of the injector unit. A quarter turn will make a real difference. Try an eighth turn first.
As the engine runs in, the idle speed will increase and in due course you can lower it again. There is absolutely no point at all in waiting for it to sort itself out, when you can fix it in about ten seconds.
Listen to what jefrs says: if you loosen the jubilee clip you can turn the throttle body such that you can get straight onto the screw without removing the seat. Then you can stick a screwdriver in your pocket, drive until it's warmed up, pull into a lay-by and adjust the idle speed as required.
Michael: the bi-starter does not cause any enrichment of the mixture. It's been discussed and explained elsewhere on this forum.
I don't agree with Alan R that you need to get it hooked up to an analyser. For a start, there's no way your dealer will have one. No, this stalling problem is so common it's probably true to say they pretty well all do it, especially when new. Even the road tests have mentioned it. The problem seems to be a conflict between the mixture the engine needs for a reliable tickover and what the catalyser needs to keep the exhaust clean. The ECU behaves slightly oddly at idle; one indication is that you may find your tickover gradually speeding up and slowing down in a repeating cycle, taking perhaps ten or twenty seconds per cycle.
My B5 was improved massively by changing to an NGK BPR6ES. If you haven't done that, then I strongly advise you do it straight away. After that, bump up the idle speed as required - described above.
papasmurf: the specified idle speed for the current UCE bikes like Dean's is even worse: 1100rpm! It sounds totally wrong on a bike like ours. I've adjusted mine to run at 700rpm, like yours, but I'm running it open-loop which makes it much easier to achieve.