Small BB In Throttle Body - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 5 (permalink) Old 05-06-2019, 09:50 PM Thread Starter
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Small BB In Throttle Body

Hi all, I took off throttle body on an EFI Bonneville to remove the grime and oxidation that had built up over the years. As I’m noting all the small pieces i’m removing, something falls out while im handling it and I have no clue where it came from. It’s a small brass sphere, like a BB. I’d post a photo but don’t know how via mobile (or my laptop for that matter). I looked into a throttle body assembly diagram with no luck. Anyone know what I’m talking about?

PS: during inspection I found both rubber transition pieces cracked under the clamp. These are the rubber boots that connect the throttle body to the adapter pieces. I recommend having a look at yours at some point.
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post #2 of 5 (permalink) Old 05-06-2019, 10:26 PM
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Originally Posted by zlatansays View Post
It’s a small brass sphere, like a BB.

Is it about 4 mm in diameter? Probably part of the choke mechanism, it's the ball+spring that acts as a detent so that when you pull the choke it stops in the first position and when you push it in fully it stays there.


The spring is probably still inside the drilled hole in the throttle body.


Locate the choke mechanism at bottom of photo, see the choke knob, follow along the operating flat bar where you first see one of two slots that limits the sideways travel and its screw/nylon washers. The next item are the two differently-sized detent holes and the detent ball and spring are laid at the side:



Last edited by Forchetto; 05-06-2019 at 10:35 PM.
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post #3 of 5 (permalink) Old 05-06-2019, 11:17 PM Thread Starter
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Forchetto you are the GOAT as we kids say. Is this your own picture diagram of the throttle bodies?

By the way, what’s your opinion on removing the bottom “plate” of the throttle bodies? They seem to be there only to complete the carburetor look. There’s two small ducts inside leading upstairs to the fuel injectors but I don’t think that chamber serves a purpose on an EFI, does it? I’m thinking of removing mine and fabricating some plates for the bottom ends at work tomorrow.
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post #4 of 5 (permalink) Old 05-06-2019, 11:32 PM
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Originally Posted by zlatansays View Post
Forchetto you are the GOAT as we kids say. Is this your own picture diagram of the throttle bodies?

By the way, what’s your opinion on removing the bottom “plate” of the throttle bodies? They seem to be there only to complete the carburetor look. There’s two small ducts inside leading upstairs to the fuel injectors but I don’t think that chamber serves a purpose on an EFI, does it? I’m thinking of removing mine and fabricating some plates for the bottom ends at work tomorrow.

I stole the photo from Triumph Twin Power's web site here:


https://www.triumphtwinpower.com/tb3...tle-bodies.php


By bottom plate you mean the false "float bowls"? I've had a look inside mine and can't see anything useful there. I'd say you can do away with them.


They could be used to hide a small amount of contraband though, no-one would think of looking in there...
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Last edited by Forchetto; 05-06-2019 at 11:34 PM.
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post #5 of 5 (permalink) Old 05-08-2019, 11:27 AM
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They could be used to hide a small amount of contraband though, no-one would think of looking in there...

When I was married I hid my money in the cooker

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