GSA Spluttering at 4000 rpm : Help please

red line · Aug 8, 2022

my 2006 GSA is spluttering at 4000 rpm when warmed up.
I have put new plugs in two weeks ago and no change.
tried the advice of running just on primary coils and sill spluttering at 4000 rpm
Bike is very very rough spluttering on just secondary coils. from what I heard the bike should run fine on only secondary coils
if I use primary on one side and secondary on the other side, it runs very rough also spluttering at around 3000

does this mean all coils need to be replaced?
or could there be other issues?

StewMcGrew · Aug 8, 2022

throttle bodies need balancing?

Bem · Aug 8, 2022

StewMcGrew said:
throttle bodies need balancing?

Did you swop the coils side for side, and is it more pronounced on one side or just generally meah?

Santa-2512 · Aug 8, 2022

Internal tank filter collapsed or coils would be my guess

red line · Aug 8, 2022

Bem said:
Did you swop the coils side for side, and is it more pronounced on one side or just generally meah?

I only unplugged the leads , did not try swapping coils .....
Any way to test for a faulty coil?

red line · Aug 8, 2022

Santa-2512 said:
Internal tank filter collapsed or coils would be my guess

if the Internal tank filter collapsed then wouldn't it run rough hot or cold. Only runs rough / splutters when warmed up

Santa-2512 · Aug 8, 2022

red line said:
I only unplugged the leads , did not try swapping coils .....
Any way to test for a faulty coil?

Do a search,

Steptoe did a walk through tests for coil faults

metropolis2k · Aug 9, 2022

Don’t know for certain but logically when it runs the worst, one or both of that pair are faulty.

Mine was had the same spluttering under power issue when I ran just on my secondary coils. Haven’t worked out which of mine are the problem, or if indeed it’s the coils at all.

waggy · Aug 9, 2022

If you need coils go to sparkplugs.co.uk and look for the ones by Champion, they are made by Beru who make them for BMW. I purchased all 4 for less than £200 delivered.
No connection to the company only a satisfied customer

Steptoe · Aug 9, 2022

If your bike is struggling to rev above 4K revs it’ll be the main coils that are breaking down. The secondary plugs fire slightly retarded than the mains to help clear up emissions. Secondary’s will cope at lower revs but not if the ignition is fully advanced.

gazza12adv · Aug 10, 2022

Steptoe said:
If your bike is struggling to rev above 4K revs it’ll be the main coils that are breaking down. The secondary plugs fire slightly retarded than the mains to help clear up emissions. Secondary’s will cope at lower revs but not if the ignition is fully advanced.

Exactly what mine did. Replaced both main coils and it was fine after.

GSA Spluttering at 4000 rpm : Help please

red line

Registered user

StewMcGrew

Registered user

Bem

younger than some, older than others

Santa-2512

Omnipotent one

red line

Registered user

red line

Registered user

Santa-2512

Omnipotent one

metropolis2k

Well-known member

waggy

Active member

Steptoe

What a waste.

gazza12adv

Well-known member

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