Low speed cough when cold

[Santa-2512]

Now the weather is drawing in, the low speed / tickover cough is becoming more apparent

I start the bike , no issues, trickle down the drive, no issues, pull onto the road and ride about 500 yds to the junction , where i normally come right of the throttle to tickover / idle

Unless i give the bike 2K+ rpm it will always give a cough and i have to get the clutch in sharpish and give it some throttle - 500 yds later at the next junction its the same again

By the time i reach the next junction, i have some oil temp showing and its fine

I'm guessing i need the get the TB's balanced ? tickover is fine its that transition from tick over to load thats the stumbling point

 

[botus]

both mine have ALWAYS done this - both bikes have had the software i-level updated via the dealer, with the older one definitely getting a later engine map, of which one element was improvements to cold start - though it didn't change the cough

when I first got the TC this summer, I thought it had a far more refined engine map - but as I got used to it, I realised it was equally if not more appalling than the earlier bike - with an even bigger first start bad running and distinct cough than the earlier bike

I then found when I went out on the old bike after a long rest, the earlier bike had really bad bar vibration (but at a very different frequency), then reading a post here and remembering it was never this bad - I have put the PC3 back on the bike and started again trying to smooth out the hideous rough running at 1700 to 2300 RPM on the old bike - its engine is so much better than the TC one with an engine capable of having a power curve you want, so missing 20% more go needlessly is worth sorting... So reviewing all the old PC maps you were able to download, and knowing what works after years of trying to do this without a dyno - the example maps show clear distinctions between utter morons, some who had the right idea, and a few experts I used to believe were burning petrol for fun

usually you can get an improvement over BMW emission incompetence with a 2 to 5 widget change at various parts of the map using the power commander, but now finding a few where they appeared to totally go mad with +20 widgets of fuel... I have now moved one pot to 34 widgets more fuel and suddenly the bad stuttering I always thought was over fueling, have smoothed out and its much happier during cold start conditions where the cough has gone... and I'm back to a far less rough vibrating mess, where the bike isn't self destructing itself

 

[Santa-2512]

Update

Coming home tonight it did it twice both times when pulling away, First a low speed junction, the second a brisk acceleration pull away

Thinking i may need to run the TB balancing / and check resync the TB's

I did think TPS , but the bike only has 19k on the clock

I may order one tommorow JIC