Carb Pumps

Twosheds

Twosheds

Junior member
Location
Surrey. England
Is it a good or bad idea to disable the carb pumps on a triple?  Is it true tha the only effect is that you get better MPG and there is no downside?
 
You could have saved us all from 10 pages of comments for and against if you used the Search facility. 
(From the menu item above rather than the box top right because the latter uses an inferior algorithm)

Just one question - why do you think DellOrto designed 'em and the factory fitted them?
 
That's useful to know about the search facility at the top right being inferior. I did not realise that. With the help of a search Two Sheds will certainly find what he is looking for. I hope he has not been discouraged from asking any further questions on the forum.
 
Rob said:
Just one question - why do you think DellOrto designed 'em and the factory fitted them?
Click to expand...

Just one (er, maybe two!) more question ... why don't 750SFCs have them? And why did my SF1 feel no different or lacking in any way when I disconnected them? It's easy enough to suck it and see - and then decide for yourself.
 
The SFC was a race bike, so likely on max throttle openings most of the time.
They were there to aid transition from primary to main jets.
 
Just filled my acc pump free SF2, 251km on 11.9 litres (4.8 ltr / 100km?), pulls like a bull in springtime as they say. Nothing to debate here, people who want them are welcome to them.
 
It was triple people who got me to take them off in the first place. I think the pump/no pump camps are divided never to meet. As Quentin says, try it without them and decide for ones self.
 
"Just one question - why do you think DellOrto designed 'em and the factory fitted them?"

95% fashion, factory, SFC's didn't have them as pointed out, and more often than not (as in nearly always) neither did factory race triples, even if they looked like they had them, unlike the SFC where the carbs CANNOT have them. I had a good half an hour with Augusto in a Noordvig hotel in 2006 on this subject.

I have been told by three dyno operators that they have to be disabled for correct readings to be taken, mine are permanently gone and have been for 200,000 kilometres. I did not notice any economy changes when they went, and no jetting changes took place (at that time) everything was fine.

It is one less job that you have to do, i.e. maintaining the bloody things and their super fine, easily blocked nostrils, letting by foot valves, pinched O rings and perished diaphragms.

Roll on the 45mm single carb conversion

CLEM
 
Personal choice in a way.

Interestly Keihin Flatslides  have them fitted. Why would Dellorto build such a carb, logic says to over come a problem.

From a 67kg jockey , would be 67.5 but I don't carry a packet fags and ligther these days!

 
Dell'Orto didn't only have Laverda to supply.

Fashion.
Very much like putting a Turbo sticker on your iron pushrod engined car.

Paul
 
Twosheds said:
Well, this has been a fascinating discussion. Just think what we all would have missed if I'd have used the search facility.
Click to expand...

Not much, it?s all been posted before. Interesting none the less.

Cam is right, the factory was probably forced into using the available carbs, as to not have an old set of PHF?s on a ?modern? bike. Fashion.
 
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