Differences between 2 spark and 1 spark motors?

[King Rat]

Is there a major advantage to the 2nd spark of the later Gee Esses?

I know it will give slightly better fuel consumption figures, praps, and I suppose cleaner emmissions, if you worry about that sort of thing. I actually look forward to the forecasted tropical temperatures and the sportfishing that will come with it.

Just wondering whether the extra compication of 2 coils and 2 plugs and leads and a hole drilled in the underside of the barrels is actually worth it.

 

[paddy dougan]

Is it worth it???

Err well no!!
I've had numerous of both and personally found no real advantage, only bonus on twin spark is...................... you get to buy an extra set of plugs on servicing!!
Just my humble opinion

Paddy

 

[ELIMINATOR]

The coil packs fail about every 25,000 miles or so.

 

[John Armstrong]

If you want ABS on the brakes you get the sevo

 

[Bryn]

Single sparks were prone to a bit of 'Hunting' at around 30mph... the twin spark addressed this

 

[Speedy]

The twin sparks were introduced to help reduce exhaust emissions, but don't do anything for the performance or running of the bike. Plus there seems to be a lot of problems with the coils for the extra plug, so a bit pointless really

 

[rockchunk]

read somewhere it had something to do with emissions burned cleaner my previous bike 1100 gs only had a single and it ran perfectly well

 

[King Rat]

So my scepticism was about right then! Just a means to produce a bigger flame front to ensure more of the fuel is burned - but properly set fuel delivery and plenty of air getting through should do this anyway.

Hunting? At 30mph? No, I would only miss! I like the idea though. With wild boar getting more and more populous and wider spread we could have pig sticking from a GS instead of horseback. Brilliant.

Right next question then. Is it worth getting an oiled, cotton gauze filter for the fresh air intake? Or are the paper ones good enough. Mine seems to go black at the drop of a hat, and it isn't oil from the breather. Mostly flies and bumble bees and the odd grasshopper too I have noticed. Someone should invent a trap so we could make use of all this free protein on the camp cooker.

Thanks for replies so far.

 

[Rugged Path]

That means us single spark guys should not feel any less subservient .

 

[Johnwhit]

while on this plug topic.
whats the best plug to use on single plug 1150 motors ?

 

[Voyager]

So my scepticism was about right then! Just a means to produce a bigger flame front to ensure more of the fuel is burned - but properly set fuel delivery and plenty of air getting through should do this anyway.

As far as I am aware, it doesn't work like that . . .

The main plugs have 'coilcaps' and are triggered as normal by the ECU to suite engine speed / load / throttle and so on.

The secondary plugs run from a central coil and are triggered late to clean up any unburnt fuel just as the exhaust stroke is happening.

Its not the same as 'twin-plugging' the 'airheads' - where the advantage (if there is one) is in producing a quicker burn by introducing two simultaneous flame fronts at the normal timing point (some say retard the ignition, others say leave it as standard. Mine is standard ).

As well as the twin-plugged 100GS, I have an '04 1150 GSA 'Twin Spark').

Bob.

 

[davegs]

Difference

main difference is two extra sparking plugs.

 

[david vaughan-birch]

Hunting? At 30mph? No, I would only miss! I like the idea though. With wild boar getting more and more populous and wider spread we could have pig sticking from a GS instead of horseback.

Havent got wild boar but plenty of rabbits down the road from you in Denstone King Rat. You're welcome to have a go!

 

[rockchunk]

Someone should invent a trap

they have seen some chaps with tea strainers over there intakes