bike has hiccups and occasionally sneezes! any idea what's going on?

[AndyMac]

Hi eveyone
2002 BMW R1150 GS 38K
I'm now 1K after a minor service at Rainbow Workshop and maybe twice each time on my commute to work, the idle sort of hiccups for a sec, maybe drops 200 rpm, then back to normal and every two days or so it sort of spasms like a sneeze and drops 1k revs and Im forced to grab and rev the throttle or it dies, happens warm or cold and when at low speed or sat in traffic, any idea what's going on?
TIA
Andy

 

[GeeGsa]

I was thinking it had a Cylinder "Head cold", but well it does sound a lot like there is/was some dirt in the carbs fuel filter etc.

 

[AndyMac]

I was thinking it had a Cylinder "Head cold", but well it does sound a lot like there is/was some dirt in the carbs fuel filter etc.

thanks I'm back at Rainbow next week so will mention to Steve

 

[Dave56]

It must be yet another new strain of Covid…..!

 

[AndyMac]

It must be yet another new strain of Covid…..!

hahah thankfully its not passed it on to me

 

[The Other PaulG]

I was thinking it had a Cylinder "Head cold", but well it does sound a lot like there is/was some dirt in the carbs fuel filter etc.

I doubt it's the carbs..

 

[GeeGsa]

I doubt it's the carbs..

Only said Carbs, as the same thing happened to my old Carb'ed bike. Not sure if that age of bike has fuel Inj. or not.
As he say's, just had it serviced, was his battery disconnected? On my r1200Gsa book it say's to switch on ignition and fully open throttle once or twice, the engine management registers the throttle valve positions...then try starting and a run.
Have always done that on all my previous bikes, after battery removal.

Archooo! oops pardon me.

 

[sproggy]

Did the problem start soon after you filled up with fuel? Because it sounds like the symptoms of contaminated fuel - had it years ago when I made the mistake of filling up at Tesco. Never used them since. I’d suggest running the tank as low as you can and then filling up with decent quality super unleaded (Shell VPower etc).

 

[davegs]

I was thinking it had a Cylinder "Head cold", but well it does sound a lot like there is/was some dirt in the carbs fuel filter etc.

Carbs?.

 

[GeeGsa]

Carbs?.

Yup Carbs, as cant spell Carburetors easily. anno I still call them that, even though Bmw r1150Gs's used the Bosch Motronic MA 2.4 Fuel Injection systems on Induction.

 

[Steptoe]

Only said Carbs, as the same thing happened to my old Carb'ed bike. Not sure if that age of bike has fuel Inj. or not.
As he say's, just had it serviced, was his battery disconnected? On my r1200Gsa book it say's to switch on ignition and fully open throttle once or twice, the engine management registers the throttle valve positions...then try starting and a run.
Have always done that on all my previous bikes, after battery removal.

The bike will do this automatically as it’s used. All it does is show the TPS the range of the throttle.

And the “carbs” are called “throttle bodies.

 

[GeeGsa]

I stand corrected.....thank you...will change my vocabulary to suit in future.

 

[AndyMac]

Did the problem start soon after you filled up with fuel? Because it sounds like the symptoms of contaminated fuel - had it years ago when I made the mistake of filling up at Tesco. Never used them since. I’d suggest running the tank as low as you can and then filling up with decent quality super unleaded (Shell VPower etc).

thanks was going to do that today