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Tuesday, April 22, 2014

Bing Carbs, Part 1

I started the carb rebuild on the Type 64-3 Bing carburetors on the R65. No hiccups so far, here's a few pics after the break:

Right side carb as removed from the bike
The photo above shows the right carb soon after removal. Its obvious that the enrichener has been leaking, hence all the dried gas gunk on the inboard (left) side, but altogether not too bad. I've seen much worse.

side-on view of the inboard side of the carb (the side closest to the bike).
I'll use this photo to make sure all the linkage goes back the way its
supposed to (see opening exploded diagram!)

Top removed, looking down the slide bore.
Someone previously had accessed this sometime over the last 33 years, as the area around the needle jet (two circles at the bottom of the bore in above photo) is heavily scratched. No need to force these out causing scratches however - just need the proper cleaning chemicals and patience. This still looks like it'll clean up nicely though.

This is the jet needle, attached to its slide that goes into the bore seen in the last photo.
You can see the needle is worn where it slides into its needle jet, near the tip.
The Jet Needle looked visibly worn, with a buildup of varnish near its tip where it rests in the Needle Jet. Some of the "wear" parts that we'll simply replace will be this needle, its jet, the atomizer, and float needle and floats, as well as any o-rings and gaskets.

Most bits needing cleaning or replacement removed, except for the enrichener circuit, still attached.

After hitting everything with carb cleaner and toothbrush.
Shown with new floats, float needle, needle, needle jet, atomizer, o-rings
To clean the carb bits, I used Berryman's B-12 spray carb cleaner, rather than a parts soaking bath. While a dunking bath would have been ideal, the new formulas I could find no longer contain MEK (Methyl Ethyl Ketone), while the B-12 spray did. MEK is simply magic for removing everything and anything non-metallic quickly, but like all "good" chemicals that work well, its pretty dangerous stuff. When it says wear eye protection, it means it. Since I wear glasses, I didn't think about auxiliary eye wear, but I should have. The overspray melted bits of my plastic lenses, and melted my nitrile gloves (yikes!).
So, boys and girls, do what I say and not what I didn't - don the dorky gloves and goggles before getting into stuff like this, and use plenty of ventilation unless you enjoy nervous conditions.

Close-up of the cleaned slide bore sans jets, and other bits
Cleaned bottom of the carb, where everything fuel-related happens.
All those little brass jets go back into all the little orifices
(matching them up correctly, of course)
The next step will be to remove, disassemble, clean and replace gasket and o-rings in the enrichener circuit - with even smaller parts!
Then of course, do it all over again for the left hand side carb.
So, much more to come...

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