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MG MGA - Jetsetter

I was given a pair of carburettor setting/balancing instruments some time ago, but do not know how to work them. I have Googled Jetsetter with no success.
Any ideas?
picture attached.

Nigel Munford

Nigel

Not seen those before but I have a set of SU balancing rods that came in one of their kits. You remove the dashpot screw-in dampers and insert the rods. With the engine running you observe the rods rise together when you increase engine revs.

http://www.mgaroadster.co.uk/su_carburettor_tool.htm

Steve
Steve Gyles

Apparently they are for setting the jet height. I see that yours show two different indications even at rest. Is there a way to zero them?
see http://www.imps4ever.info/tech/carbs/twin-carburettors.html
John DeWolf

It can also be used to check piston movement like the wire indicators Moss and others sell. There is some discussion of it on this site http://www.mgexp.com/phorum/read.php?1,2475549,page=2
John DeWolf

Nigel
Are those Phillips screws in the center?...If so , maybe they are for zero setting....
You'll need a very small head or a really flexible neck , to see them while in the car! (LOL!)....
But a telescoping mirror will help.
Edward
Edward Wesson 60MGA

I use an external vernier caliper to measure the jet depths. I make a note of the settings before dismantling the jets for overhaul then use the same measurement on reassembly. Always spot on.

Steve
Steve Gyles

Thanks for the answers.
JOHN. Yes, they can be zeroed. There is a small lever at the back.
I may try to sell them on Ebay, I can't see me using them!
Nigel Munford

Nigel, a single Jetsetter (with instructions) sold for £77 on ebay last year. For your 'matched' pair you shouldn’t have a problem.

Richard
R A Evans

Richard;
Wow, thanks for that info.
Nigel Munford

Are these used to set the jet height with the dashpot removed? If so, what would the benefit of having two be?
Neil McG

Exactly what I what i was thinking Neil. I only use one Vernier caliper.

Steve
Steve Gyles

I don't know if this is significant, but one has a moving blue needle, and the other a red needle.
Nigel Munford

This thread was discussed between 02/01/2014 and 03/01/2014

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