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  VW Parts Catalog > Carbs & Fuel System >

Solex, Kadron, Brosol, and Bocar Idle Jet (Sold per EACH)
Solex, Kadron, Brosol, and Bocar Idle Jets
 
Idle jets are one of the simplest to access, and therefore the most commonly screwed-up parts on aircooled Volkswagen engines. It's located on the outside of the carburetor body, towards the top, usually on the right side of the carb. It's a brass hex-headed screw, so it's pretty obvious. Bubba Mechanic's often remove this jet and drill it to whatever size bit they have lying around the tree, because "they don't want to be lean". And they aren't lean, they are pig rich! If you don't have a set of jet gauges or micro drill bits to measure with, get a new jet in the size you want. This is one more thing to ensure your engine is running the way it is supposed to!

Jets are sized in "milimeters", so a "50" jet is very close to .5mm. Actually they are rated on flow not size, after they are measured on a flow machine. That's why drilling and reaming jets is not necessarily a good idea, since drilling or reaming can result in a 55 idle flowing more than a 60 idle, based on orifice length and entry/exit radius, etc.
Price: $8.00
Item eligible for Econo/1st Class Mail shipment, min ship charge applies


: SOLEX-IDLE-JET

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Overview
 
Aircooled.Net are VW jetting experts, and will help you jet your carb(s) properly! We carry the jets, and more importantly, the knowledge and experience to get you the correct jets without you buying a bunch of jets you will not use!

Aircooled.Net are jetting experts, and will help you jet your carb(s) properly! We carry a lot of jets and sizes that other places do not. Many times jets have been drilled and/or reamed to a size different than stamped, so we always recommend buying new jets if you aren't sure, and do not have tool access to verify their size. Solex, Kadron, Brosol, and Bocar Idle Jets are screwed into the outside of the carburetor, they are not internal, so jet changes are fast and easy!
Item Features
Kadrons, use a 50 or a 55 idle, Kadrons often run much better on a 50 than a 55. Also know that there are a lot of guys running 60 and 65 idles on their Kadrons, and those are the guys that fail their emissions tests and get 17mpg instead of 35. While many do not care about emmisions (especially if it's not required anymore for your year), it also means they are washing the oil off their cylinders, and this results in a massive increase in piston, ring, and cylinder wear due to oil dillution. Gasoline is a crappy lubricant!

Solex, Brosol, or Bocar 34-3, or 30/31, use a 60 idle, and a 50 power jet (also called the "Pilot Jet). This seems wierd, but it's because of the construction of the idle and progression circuit (most guys have never ever bothered to look at it closely), which uses both jets (Combined area), in conjunction with 2 big idle air bleeds. The Idle Jet and Power Jet are physically interchangable, but are different sizes. These are often switched on carbs by guys that think the idle jet should be small and the power jet should be big! Make sure the Power Jet (50, in the ANGLED location) is to the rear, and the Idle Jet (65, out the side) is in the front .

30 Series carbs should use a 50-55 idle jet.

If you are at elevation, your engine will be happier with a smaller idle jet. Go down "1" for every 1k' above sea level you are at. So Denver (5k') will be a "-5" from a sea level jetting on the idle jet.

The engine's idle will be based on the IDLE MIXTURE SCREW. Because of this characteristic, it's possible to be idling too lean with a 70 idle jet, yet too rich with a 45 idle jet, depending on how the idle mixture screw is adjusted!

So the idle jet size should be selected based on how it DRIVES on the progression circuit (not how it idles), which are throttle conditions from off-idle to around 1/3 throttle. Obviously a Wideband or a 5-gas Analyzer are best for this, please read our Wideband Tuning article for more insight!

Average Customer Review: Average Customer Review: 5 of 5 5 of 5 Total Reviews: 2 Add your review too!

Related Items...
Main Jet for Solex, Kadron, Brosol, and Bocar Carburetor (sold per EACH)
Price: $7.00
Item eligible for Econo/1st Class Mail shipment, min ship charge applies
Main Jet, Solex, Kadron, Brosol, and Bocar Carburetor
Solex, Kadron, Brosol, and Bocar Idle Jet, Micro Sized
Price: $10.00
Item eligible for Econo/1st Class Mail shipment, min ship charge applies
Solex, Kadron, Brosol, and Bocar Idle Jet, Micro Sized


  1 of 1 people found the following review helpful:
 
5 of 5 Idle and power jets October 19, 2016
Reviewer: Robert Aichele from Cleveland, OH United States  
I had a HO30/31 running for almost three years and could not tune it right, I knew something was wrong but couldn't find any answers, it was a brand new carb. After reading this article and looking closely at my carb, I found the jets were switch, just like bubba in the article. I ordered new jets. So happy to have the information.

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  4 of 4 people found the following review helpful:
 
5 of 5 Best December 17, 2012
Reviewer: Andrew Eckman from Naugatuck, CT United States  
Best replacement jets. Fit perfectly and the ball valve doesn't get jammed like some others. Great price also. Most place you have to buy like 30 jets. Aircooled sells them single.

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