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  1. #1
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    '75 R90/6 - Bing 32 (11/12) question + timing issue

    Hi,
    I'm in the process of sorting out my '75 R90/6 and I'm doing a basic clean and rebuild of the carbs. Once I got into it I noticed that my carbs do not have an external choke return spring. Also in the bowl I discovered that neither float had a "hairclip" retainer (the fine wire that connects the float-bowl tang to the float needle). Just wondering if these are in fact missing or if it is just a model variation? Thanks...
    Last edited by sprouty115; 10-14-2017 at 01:03 PM.

  2. #2
    Liaison 20774's Avatar
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    Welcome to the forum! My 19/20 carbs don't have any return spring for the choke...the choke position is physically changed by moving the handle on the engine under the tank. Not sure if that's the spring you're talking about. There may be a small spring inside the choke assembly, but that's there probably for taking up any slop.

    As for the small hairclip retainer, according to the Bing manual, the type 64 carbs don't have that, but the 64-2 and 64-3 carbs indicate they were used. It's there for a more positive pull down of the needle valve...I suppose it could be useful. I don't recall if my /7 carbs (also 64s) have them or not, but I haven't had any issues that I could attribute to that.
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  3. #3
    ABC,AMA(LIFE),MOA,RA,IBMW MANICMECHANIC's Avatar
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    What Kurt said. The "choke" (enrichener) on your bike is operated by a very stiff wire, which gives positive operation, so no return spring is needed. Just ensure they are set up properly, so they are OFF fully.
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    Airmarshal-IL James.A's Avatar
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    Return springs on enricher levers are associated with later models with the choke actuating lever on the handlebars. The little spring/bale on float needles are employed to help keep the needle placed correctly on the float tab. It is probably every kind of wrong, but, I have never worried about those little retainers being missing in any of the airheads I have owned.
    1973 R75/5

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    Thanks for the the info. I got a little confused by the images I was running across while looking for the rebuild kit. This is my first airhead (after wanting one for decades), and I have to admit there is a bit of a learning curve - my most recent rebuilds have been 2-stroke RD 350/250's and those bikes are as simple as they get.

    BTW, the bike has about 13K original miles (based on service records and the general condition of the bike), and it doesn't look like it's been molested, but I'm still surprised by what I'm finding after I was told the bike was in for a service 5-months ago: missing spring on on idle adjustment screw, main needles in different positions (one was in the 1st notch, the other was in the 4th), carbs wildly out of balance, valve clearances set to opposite specs, points settings well out of spec.

    I wanted a project bike, so I'm looking forward to working on it, but it just struck me as odd that some basic things were so far out of whack...

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    ABC,AMA(LIFE),MOA,RA,IBMW MANICMECHANIC's Avatar
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    One of the best things you can do is join up with the Airheads (MOA 214) They are people who own and care for the bikes and have a passion for keeping them running. You didn't say where you're from, but there are often Airhead tech days around, just to keep the info flowing and the bikes running.
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    Quote Originally Posted by MANICMECHANIC View Post
    One of the best things you can do is join up with the Airheads (MOA 214) They are people who own and care for the bikes and have a passion for keeping them running. You didn't say where you're from, but there are often Airhead tech days around, just to keep the info flowing and the bikes running.
    Thanks, as it turns out I joined a few days ago. And I'm in Rhode Island - definitely looking forward to upcoming events.

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