I have a 60thou over bore and a modded engine so when i determined that the carbies had 30mm chokes I went up to 34mm chokes.
A decision I may have to regret soon - we'll see...
34mm chokes = 135 mains and i think the 200 a/c were due to nearest available.
so thats why i have what i have.
 
I'll look into the wideband sensor - from here at work today I can't determne if i can use a wide band with the gauge or not.
Thanks ratta.

While not exactly the same as DOCEs, I'm running early italian 40 IDFs with 34 chokes, 4.5 aux, 135 mains, 180 airs, 57 idles, F7 emulsions, 50 bleeds on .040" o/size with 'Vizard stage 1' ported head, back cut valves, 10.5:1 compression, mild crow 26874 billet cam, large bore pacemaker headers and 2 1/4 single box exhaust. Using F7 emulsions for the fatter off cruise progression, on the dyno fuel runs in the 13s across the range - technically slightly rich and while no rocket ship theres no spitting and pulls clean.
http://www.youtube.com/embed/w0E7-Wl4uU4

Woah thats so like mine.
I did the porting myself but i followed vizards instructions. similar valves. similar compression, same extractors.
awesome - thanks
 

man i sounded 16 then!

razzle308

I have a 60thou over bore and a modded engine so when i determined that the carbies had 30mm chokes I went up to 34mm chokes.
A decision I may have to regret soon - we'll see...
34mm chokes = 135 mains and i think the 200 a/c were due to nearest available.
so thats why i have what i have.

I'll look into the wideband sensor - from here at work today I can't determne if i can use a wide band with the gauge or not.
Thanks ratta.

 
No need to stress, 34 chokes will be fine once you get the rest of the jetting sorted
 
Woz

Cam and carbs very similar to mine
 
I've forgotten what I've got so will open up carbs tonight and list specs
 
I have a bunch of jets and idles etc if you want to keep playing
 
Getting the idles right is very important.
 

Hey Avon.
Did you see your spoiler??
 
Thanks that would be good.
Are those jets on loan?
 
I took my 34mm chokes out and put the 30's back in and runs so much better but i really want the 34's back in. Seems a shame to do so much porting and then choke it down. I understand the vac and velocity thing i just would like the extra breathing.
 
Hope the move went ok.

Righto here they are
 
Idles 40f9
Pump bleed 50
Pump squirts 40
Mains 130
Air 170
Emulsions F16
 
And on 33mm chokes.  Gets asthma after about 5500 rpm but great torque before then.
 
I'll have a sift through jets collection and see what I've got.  Forgot to take spares to dyno tune and so had to buy replacements at full workshop price.  Yewouch.
 
Yes move went well thanks.  Now have garage!

Hey Avon.
I need a garage that is not our garage - but i have to build it :-( $$$
Wow - 33mm chockes. I think i have to get new leads - go over my cam timing again. Sort out my balancing once and for all coz it ran on my 34's like a pig. back to 30's and it not too bad.
Went for a run on sunday and still spits out the carbs a bit - chronic out the exhaust on decel and did a strange thing on the freeway. When i went to exit the revs stayed up - which would normally indicate lean but gauge still says off the scale rich. And it stayed like it for a while.
I dunno.
Gearbox has to come out now to see where oil is coming from. :-(
 
Thanks fo rthe info - my idles are definitely too big!

razzle308

Hey Avon.
I need a garage that is not our garage - but i have to build it :-( $$$
Wow - 33mm chockes. I think i have to get new leads - go over my cam timing again. Sort out my balancing once and for all coz it ran on my 34's like a pig. back to 30's and it not too bad.
Went for a run on sunday and still spits out the carbs a bit - chronic out the exhaust on decel and did a strange thing on the freeway. When i went to exit the revs stayed up - which would normally indicate lean but gauge still says off the scale rich. And it stayed like it for a while.
I dunno.
Gearbox has to come out now to see where oil is coming from. :-(
 

Thanks fo rthe info - my idles are definitely too big!

 
Are you changing your main jet when you change your chokes?  You should be.  If your not then what you're doing is indicating it is too lean with the larger choke, as when they are fitted there is less signal on the main jet and it needs to be bigger.
 
You really need to take it to a dyno with someone that knows webers and do it properly.
 
Woz