Stuttering at low revs

[Howard J]

My new to me 2003 1150GS seems to stutter a bit at low revs, so for example from stationary I have to grab a handful of revs otherwise feels like it will stall, at a small amount of revs I can feel the engine stuttering. I have set the throttle bodies and idle which is around 1100.

 

[ynotbiker]

last time fuel filter changed?check hose in tank the u bend one might have small split.

 

[Howard J]

last time fuel filter changed?check hose in tank the u bend one might have small split.

Now that you mention it I can hear the fuel pump all of the time, is this usual? I can’t remember from my last 1150GS

 

[ELIMINATOR]

My new to me 2003 1150GS seems to stutter a bit at low revs, so for example from stationary I have to grab a handful of revs otherwise feels like it will stall, at a small amount of revs I can feel the engine stuttering. I have set the throttle bodies and idle which is around 1100.

Coil pack maybe?

 

[Howard J]

I think it is coils I need.

I disconnected the LHS secondary coil whilst engine was running and the engine tone changed , disconnected the LHS maiin stick coil and no change to engine running!

I then disconnected the RHS secondary coil and there was no change, disconnected the RHS main stick coil and the engine tone changed.

So I think I need 1 stick coil for the LHS and maybe a secondary coil pack to sort the RHS secondary - 2003 GS twin spark

Does anyone have any spare for sale?

 

[ELIMINATOR]

I think it is coils I need.

I disconnected the LHS secondary coil whilst engine was running and the engine tone changed , disconnected the LHS maiin stick coil and no change to engine running!

I then disconnected the RHS secondary coil and there was no change, disconnected the RHS main stick coil and the engine tone changed.

So I think I need 1 stick coil for the LHS and maybe a secondary coil pack to sort the RHS secondary - 2003 GS twin spark

Does anyone have any spare for sale?

There isn't a secondary coil pack.

 

[Howard J]

There isn't a secondary coil pack.

Ok not that familiar with the secondary plug set up, I thought the secondary plugs went to a coil pack under the tank if not where are the coils for the secondary plugs on a twin spark? Ta!

 

[ELIMINATOR]

Ok not that familiar with the secondary plug set up, I thought the secondary plugs went to a coil pack under the tank if not where are the coils for the secondary plugs on a twin spark? Ta!

Ok not that familiar with the secondary plug set up, I thought the secondary plugs went to a coil pack under the tank if not where are the coils for the secondary plugs on a twin spark? Ta!

Ah, I thought that you were thinking that the secondary plugs ran of a stick coil setup.

My fault, ignore me..

 

[JohnnyBoxer]

Just buy new from a BMWs main dealer
Main ones are about £120 each & come with a 2 year warranty
I bought two last month and spot on now
Old ones lasted 20 years and 70.000m so cannot grumble for a £240 repair (£12 a year)
Replace as a pair and keep the old good one as a spare in the bike’s toolkit

 

[Steptoe]

I think it is coils I need.

I disconnected the LHS secondary coil whilst engine was running and the engine tone changed , disconnected the LHS maiin stick coil and no change to engine running!

I then disconnected the RHS secondary coil and there was no change, disconnected the RHS main stick coil and the engine tone changed.

So I think I need 1 stick coil for the LHS and maybe a secondary coil pack to sort the RHS secondary - 2003 GS twin spark

Does anyone have any spare for sale?

Have a think about what you’re doing and the conclusion you’ve reached !!! .. you do not need the coil that supplies the lower plugs via HT leads

 

[Howard J]

Thanks Neil,

 

[Howard J]

Changed the coil and seems to be running so much smoother, I’ll take her out for a ride to see. I hadn’t ridden an 1150GS (or any other bike more recently) for some time and although I remember them being a bit agricultural it just didn’t seem right!