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Bing Carb Type 64 adjustments INNOCENT GLOBAL 0.0000 1.0000

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larry(at)macsmachine.com
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Posted: Mon Apr 10, 2006 8:35 am Post subject: Bing Carb Type 64 adjustments INNOCENT GLOBAL 0.0000 1.0000

Hi guys,

The necessity of changing jets can be a stress raiser if you've not done 

it before, but I've made most of the mistakes and can finally comment 

that theres little to worry about, but there are a few things that make 

the job safer and easier for Bing Type 64 carburetors.



Disassembly can be done right on the engine and should not be a problem 

with the Stratus Subaru setup. Fuel valves should be shut off. You do 

need a Bing Manual the first time or so as it offers very specific 

guidance on everything.



Air filters are removed and the intake tube opening covered with a shop 

rag to prevent dropping anything into the intake. Then the throttle 

cables and enrichment (choke) cable lugs need to be disconnected. 

Rotating the enrichment lever against the spring allows removing the lug 

and cable. The throttle cable bracket is disconnected at one end to 

allow it to be pivoted from over the enrichment return spring. The 

spring is disconnected and set aside. Two large Phillips top cover 

screws are removed. Anything that would prevent lifting the cover 

vertically a couple of inches should be removed.

The throttle is closed to prevent anything from dropping into the 

intake. The cap, jet needle housing, diaphragm and large spring are 

lifted off and rotated out of the way. The large spring and jet needle 

housing is set aside. Note the jet protruding inside the bottom of the 

carburetor body.

The jet needle is accessible only after a large blade screwdriver is 

used to unscrew the threaded retainer from within the topside of the 

tube. Using too small a screwdriver can easily damage the retainer slot 

and make it non removable, so grind a large one down to fit inside the 

tube if necessary. Remove the needle and adjust the circlip as 

necessary. Note the jet needle identity size by counting the rings, not 

the notches for the circlip.

The lower fuel float reservoir spring is pivoted to the rear and up 

enough to allow the reservoir and floats to be lowered, removed and set 

aside.

Before removing the main jet and mid-range jets, take a 6-inch piece of 

.020 stainless safety wire and insert it down thru the opening of the 

jets allowing 2-inches to protrude out the bottom. Bend the wire to 

prevent loosing the small jets as they are removed. The main jet is 

removed first. Take note of the size of the main jet and set it aside. 

The mid-range jet is removed second and all successive parts are removed 

on the wire to keep them from dropping out of sight. Sizes are only 

found stamped on the main and mid-range jets. Make changes as needed and 

take note of the arrangement of the jets shown on the Bing exploded view 

to be sure that the jets are reassembled in proper order.



For reverse assembly, be careful to not stub the jet body end going back 

into the carburetor body. Be careful to not damage the reservoir gasket 

on reassembly. Be careful about alignment of the diaphragm key, 

alignment of the jet needle, the enrichment lug, and final throttle 

cable position etc.



Small wrenches used to remove the jets and throttle nuts are 8mm, 9mm 

and 10mm combination open and closed end. These are easily purchased as 

a set of small ignition wrenches in a plastic envelope from Sears. If 

you do drop a 10mm nut into the intake as I did once, you can remove it 

with a high-powered vacuum sweeper by opening the intake valves one side 

at a time with the spark plug removed while rotating the engine slowly 

by hand. Just dont make that mistake!



Have a good day.



Larry McFarland - 601HDS at www.macsmachine.com

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frank.hinde(at)hp.com
Guest

Posted: Mon Apr 10, 2006 8:52 am Post subject: Bing Carb Type 64 adjustments INNOCENT GLOBAL 0.0000 1.0000

Thanks Larry...I was told since my earliest days (and maybe it is an old

wives tale) to never poke wire through the middle of a jet...So I didn't

and it was still pretty simple to do.



The other point was the one I think you made (and is called out in the

Bing Carb manual) is to use a color tune to set the idle jet...Marvelous

device. If your brave like me (or stupid depending on your perspective)

and don't remove the prop be very careful as you use the color tune,

both from the rotating blade hitting you in the head and the fact the

engine is now under some load which increases the cylinder

pressure...ypu could if you revved up the engine have the color tune

window explode into your eye!



But don't let any of this worry you....



Frank



Before removing the main jet and mid-range jets, take a 6-inch piece of

.020 stainless safety wire and insert it down thru the opening of the

jets allowing 2-inches to protrude out the bottom. Bend the wire to

prevent loosing the small jets as they are removed. The main jet is

removed first. Take note of the size of the main jet and set it aside. 



Larry McFarland - 601HDS at www.macsmachine.com

- The Matronics Stratus-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Stratus-List

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