VM air corrector jets

[Agemax]

Anybody here fitted the Ledar (or other make) air corrector jets to VM26 or 28 carbs? if so do they make a difference and does anyone know what size the orifice in the jet is please?
TIA

[Rijko]

don't often see unanswered posts here.

And it's an interesting subject !

My first experience with air corrector jets was with the Suzuki GT750.
The CV carbs (Mikuni BS40) were prone to surging, which would
make the GT750 bog at low speed.
In 1974 Suzuki published a solution in one of their Suzuki Service Bulletins,
which required threading the pilot jet intake passageway for a Mikuni air jet
to restrict air intake to 0.8 mm or 0.9 mm.

These were 4 mm threads and do not fit the larger holes in the GS VM carbs so afaik that
is why the 5mm thread jets were created ao by Ledar.
I have 1 set of VM28SS carbs with K&N pods on them that use these and it runs smoother
than the other bike with the exact same configuration and carb setup (except for the air corrector jets) at low revs.

I believe they are .6 mm

[Nessism]

A guy on the KZ site had a bunch made up which he ebay's. Says they make a huge difference. Pretty sure he's UK based.

[Agemax]

I ended up making my own, bought some M5 x 8mm brass grub screws off eb@y, found an original Mikuni air corrector jet and copied the entry venturi size and outlet size then drilled them 0.6mm. tapped the hole in the VM carbs to take the screws.
First trial was good but not as good as i hoped so i started to enlarge the holes gradually by 0.5mm at a time and roadtested again. I have APE pod filters so changing them was only a 5 minute job.
Eventually i got to 1.1mm which i deemed to feel the most benefit, once i got to 1.15 i felt the midrange start to fluff up a bit.
Obviously this was my bike, in British climate, and my own "feeling" of how they performed. No dyno run or any confirmed power difference, but i am happy

[erki52]

You can quickly go off people that have the knowledge / skills / balls to do something like this. Usually takes me weeks just to build up the confidence to do simple repair jobs.