weber jets

brockharro · Post by **brockharro** » Sun May 20, 2012 8:57 pm

hey i got a weber carby second hand from melbourne of a ea81 but i live in the mountians and its running rich does anyone know if ive only gotta change the mains or the air correcter jets aswell

steptoe · Post by **steptoe** » Sun May 20, 2012 10:21 pm

Brock, my only experience was to buy a weber off here and later onsell it to a dude that was having trouble with his weber. He had same troubles, blamed me, failed to pay balance and disappeared.....it may have been webers were both stuffed or needed a knowledgeable person installing it/them. Thjey may have a weakness. But , yours is off an EA81 for starters so you'd think it would be correct but for the thinner mountain air .... rejetting ??
Usually only carbs need fuel jet changes not air bleeds. Might help if you could tell what jets numbers you are running where.....

brockharro · Post by **brockharro** » Sun May 20, 2012 10:33 pm

steptoe wrote:Brock, my only experience was to buy a weber off here and later onsell it to a dude that was having trouble with his weber. He had same troubles, blamed me, failed to pay balance and disappeared.....it may have been webers were both stuffed or needed a knowledgeable person installing it/them. Thjey may have a weakness. But , yours is off an EA81 for starters so you'd think it would be correct but for the thinner mountain air .... rejetting ??
Usually only carbs need fuel jet changes not air bleeds. Might help if you could tell what jets numbers you are running where.....

cheers thats the plan im gunna put it on a gas bench and see if its running rich then if it is ill have a look and go the next size down cheers just wasnt sure bout the air jets
and after the new carb if i put my foot down in a high enough gear it just revs out buy doesnnt go anywhere if u got anyhelp on that itll be great

steptoe · Post by **steptoe** » Mon May 21, 2012 11:22 am

that sounds like you are burning rubber, or clutch

brockharro · Post by **brockharro** » Mon May 21, 2012 7:07 pm

haha nah its neither coz i if knock it back a gear and floor it it goes fine

YouTube · Post by **El_Freddo** » Thu May 24, 2012 2:54 pm

brockharro wrote:haha nah its neither coz i if knock it back a gear and floor it it goes fine

I'd say that your clutch is on the way out. At higher revs in the lower gear there's less torque in play for the clutch to hold.

If you try it in 1st gear, get the car rolling then floor it - if the engine revs and you're not going anywhere it's new clutch time.

As for the jetting, if it's already set up properly the altitude shouldn't have much of an effect on fuel richness. The carbie will "adjust" simply through the surrounding atmospheric pressure if that makes sense.

Cheers

Bennie

littlewhiteute · Post by **littlewhiteute** » Thu May 24, 2012 5:38 pm

Running rich at what throttle opening?

Main jet change affects the whole range, air jet affects top end.

Altitude does affect jetting because the air in thinner (less dense, less oxygen).
Same amount of fuel with less oxygen becomes rich.

It is the reason why professional carb tuners take a barometer to the race track.

brockharro · Post by **brockharro** » Tue Aug 06, 2013 6:58 pm

hey guys been ages yer im gunna rebuild it but would love to know what size jets people are running to see how close mine are to what other people have

and yer was clutch haha all fixed now

Post by **TOONGA** » Tue Aug 06, 2013 7:14 pm

I have a 135 main and secondary (from memory) but I use an ADM34 which is still a weber but used on 4.1 litre ford engines.

135-140 for the main and 150 for the secondary will work

50-60 for the idle jets, I use 50 on both sides others use 60

Haynes weber carby manual

https://rapidshare.com/files/1267072237/W%20C%20M.rar

TOONGA

Smokey · Post by **Smokey** » Wed Aug 07, 2013 5:53 pm

Noob response here. How can I tell what air and fuel jets I'm running? Assume I need to take them out. Old gasket OK to reuse I assume. Had it off before with seemingly no I'll effects.

I'm at sea level or close enough to. Driving up the New England HWY fully loaded w camping gear and 4 FAM passengers at 1400m odd it was close enough to underivable. Gutless as all wonder. Almost felt like I was towing a ton more than at lower altitudes. Returned to normal as I got closer to sea level.

Will read that Haynes manual. Thx for the share.

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