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Guest Message by DevFuse
 

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weber jetting


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16 replies to this topic

#1 disom93

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Posted 11 February 2014 - 06:24 PM

Whata the best jetting for a weberized ea71

#2 spazomatic

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Posted 11 February 2014 - 07:56 PM

I think that would mostly depend on your elevation...im at 8000 ft, and so my jets are fairly small (120 primary, 125 secondary)
Whats it got in it now?

#3 RustyBrat

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Posted 11 February 2014 - 08:49 PM

140 on both works well here at ~4000 ft. (stock size jets)



#4 disom93

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Posted 11 February 2014 - 11:07 PM

Ok im at or around 3000 feet + or -

#5 disom93

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Posted 11 February 2014 - 11:08 PM

Ill post my sizes when get home.

#6 disom93

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Posted 12 February 2014 - 02:00 AM

Ok my jeting is primary air corrector-170. Secondary air-180. Primary main-130 secondary main-150 idle jet primary- 60 secondary-50 any help greatly appreciated

#7 ferox

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Posted 12 February 2014 - 02:11 AM

mains 140/140

Primary air 170

Secondary Air 160

idle jets 50/50



#8 disom93

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Posted 12 February 2014 - 07:40 AM

Ok would my jetting being like it is cause bad mpg? Like 17mpg?

#9 spazomatic

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Posted 12 February 2014 - 08:58 AM

I bet your 130 is pretty close to correct, but that secondary jet is likely too big. If you stick your foot in it a lot, that could definitely contribute to lousy mileage (the secondary bein too big)
Given it a tuneup lately? 17mpg is horrible!

#10 disom93

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Posted 12 February 2014 - 10:26 AM

New plugs wires, rebuild on carb, throttle shaft bearings, lean best idle tuned. It has 205-65 directional mud treads on it tho

#11 RustyBrat

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Posted 12 February 2014 - 10:27 AM

Just try driving like a grandma for a tank and see how that goes

#12 disom93

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Posted 12 February 2014 - 10:37 AM

I will do that next tank. I think i will order the replacement jets one day, maybe itll help i had seen on here a guy got 32mpg in a 2wd wagon with that jetting

#13 ferox

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Posted 12 February 2014 - 09:38 PM

Based on what you have, the most important jet you should change is the primary idle jet.


Edited by ferox, 12 February 2014 - 09:39 PM.


#14 disom93

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Posted 13 February 2014 - 02:41 AM

Ok would it be worth it to get them all to what they need to be and with that primary being off ehat would it do to my brat?

#15 ferox

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Posted 13 February 2014 - 10:47 PM

Ok would it be worth it to get them all to what they need to be and with that primary being off ehat would it do to my brat?

It's easily worth it to get the exact correct jetting.  There are very few automotive parts that have a greater benefit/cost ratio than proper jets. 

 

With the primary being that rich you would get shitty gas mileage and it wouldn't idle very well with the idle screws set within Weber spec.

 

I would order a 45 idle jet along with a 50.  The less you have to turn in the idle speed screw to achieve stable idle within spec, the better your throttle response.  As you go down in primary idle jet size your idle speed should increase which should allow you to dial back the idle speed screw.  With an ea71 and larger tires you're probably going to want all the throttle response you can get.  With a decent ea71 and mud treads at 3,000 ft I would expect to get 21-24 mpg depending on the tires and driving style.



#16 disom93

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Posted 14 February 2014 - 09:11 AM

Ok my idle is very erratic now

#17 Demon Brat

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Posted 16 August 2014 - 06:16 PM

What about an Iowa Guy with an elevation of 761 feet driving a 1979 Brat with a EA71.  Idle is not smooth and I have to turn the idle adjustment screw out like 3.5 times before it sounds good.






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