Twincam cough?

Santa-2512

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Noticed tonight when low speed filtering , If i close the throttle and then need to open it for a little burst of speed, ii occasionally get almost a stall ( cough) then it clears

I had it on the single cam, but it wasnt too bad, not at all on the LC but the TC hex its quite pronounced ..

Any ideas ??
 
I seem to remember mine did that I think the upshot was they are prone to do it, no ryme or reason

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I've had a cough (getting better after a lay-up) and I was going to look at balancing the throttle butterflies first. I get some popping on the overrun as well.

But thanks Johnnyboy for the tip about the TPS!
 
as I get more used to my new twin cam, fueling is a joke too - quite disgusting when cold and now feeling it on hot days as it starts up for 3 miles
and some moron at the factory has made the throttle spring twice the effort of the better earlier ones

AF-XiED

 
I did think of rebalancing the TB's , but given it only has 16K on the clock

TPS i have a Used backup in the shed - but i may pick one up from the bay

Ta
 
Balance the throttle bodies as it comes just off idle, Just as you give it the slightest bit of throttle.
 
the cough is likely opening the throttle quicker than the fueling is keeping up ( that's why bikes used CV carbs for so long and why everything is now fly by wire - you might comand everything, but the computer now opens the throttle bodies at a rate the engine copes with - not a dead bit (the cough). My TC does this - my old one doesn't - likely becomes more fun when the flap valve in the exhaust is not there, or not timed correctly, its not carb balance that causes it - there is nothing to burn so it waits till there is....

not sure the benefit of ignoring the fix I mentioned

...allows you to change the closed loop fuel injection air/fuel ratio from the stock overly lean 14.7:1 ratio (the main culprit in surging and poor throttle response issues) to as low as 13.6:1. Advanced circuitry changes the O2 signal sent to the stock BMW Motronic fuel injection brain to achieve a richer air fuel ratio. Benefits include elimination of surging, much better throttle response and acceleration, better pull from low rpms in all gears, the ability to ride a gear higher than normal and reduced pinging.

This is a much simpler, more elegant and less expensive solution than piggy-back fuel controllers like the Power Commander to the notorious lean running condition on the BMW R1200 Hexhead and Camhead, bikes. The BMW-AF-XiED allows the full use of the Motronic and leverages its adaptive abilities to also richen open loop air/fuel ratios. After a couple tank-fulls of gas your bikes Motronic will have full adapted and the bike will be running better and better. We have tested this device back to back with a dyno tuned Power Commander on one of our personal bikes and came away so impressed we sold the Power Commander and started carrying the product
 
I had a TC for 5 yrs and it didnt have a "cough" although I serviced it on time plus checked and adjustment the TBs each service. I added a booster plug if that made any difference I dont know
 


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