Overnight parts...

"Racescort666" (Racescort666) 06/01/2015 at 16:31 • Filed to: Two wheels bad

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Well, not really overnight parts since it was back ordered and I only received one when I bought two. Nonetheless, it’s from Japan and insanely expensive.

What you are looking at is described as a “piston” by the Suzuki OEM parts diagram. It is a piece in the carburetor of my Suzuki Bandit. It holds the metering pin but I'm not sure exactly what it does since I don't have that much experience with carburetors.

atrombs > Racescort666 06/01/2015 at 16:34

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What does a small plastic(?) piece like that cost ya?

Racescort666 > atrombs 06/01/2015 at 16:35

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$87 fortunately shipping was free.

jkm7680 > Racescort666 06/01/2015 at 16:37

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Ooohh new stuff.

atrombs > Racescort666 06/01/2015 at 16:40

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holy shit! things like that always amaze me. Like aviation parts, 85 dollars for a single bolt.

RamblinRover Luxury-Yacht > Racescort666 06/01/2015 at 16:41

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Dashpot/variable venturi piston? Just hazarding a guess, with you saying it holds the “metering pin”, there is probably a setup that makes this thing move while controlling fuel flow based on present vacuum/current position? That’s the sort of thing you see more in bike carbs and carbs on things that are Insanely British - general experience with carbs might or might not have helped. One kind of SU pictured:

PS9 > Racescort666 06/01/2015 at 16:45

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80 fucking 7 fucking dollars??????!

Racescort666 > atrombs 06/01/2015 at 16:50

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Yeah, it's that low production volume stuff that kills you. Pretty much all motorcycle parts are like this. It's like this on every bike I've owned.

Racescort666 > RamblinRover Luxury-Yacht 06/01/2015 at 16:51

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That looks to be exactly what it is. The wowed thing is that the choke closes off the vacuum line going to the top. I assume this is so that it stays in the down position with the choke on.

Racescort666 > PS9 06/01/2015 at 16:53

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Yeah. That’s why I bought 2 instead of 4. I’m in used carb territory for cost but I decided to go this route since it was a little bit cheaper and probably the “right way”.

RustedSprinter > Racescort666 06/01/2015 at 16:53

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Suzuki!

atrombs > Racescort666 06/01/2015 at 16:57

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How great would it be if you could just 3D print one?

Racescort666 > atrombs 06/01/2015 at 17:04

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Pretty awesome. I suppose I could send one out and get it blue light scanned.

desertdog5051 > Racescort666 06/01/2015 at 17:07

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It appears to be the same as my Keihn on my HD. The metering pin goes in the center hole. The other 2 side holes are open to the chamber above them. The rubber gasket sort of thing allows the piston to move up and down. As air passes thru the venturi, it causes a low pressure to occur in the chamber above. This lifts the piston with the metering rod out of the jet below it. The rod is tapered so as it raises, it gets smaller. This allows more fuel to pass. Simple principle and it works quite well.

desertdog5051 > Racescort666 06/01/2015 at 17:12

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And another thing. Check this place first. They carry a lot of OEM parts.

http://www.bikebandit.com/

desertdog5051 > RamblinRover Luxury-Yacht 06/01/2015 at 17:13

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You are correct. His carb is a lot simpler than the SU. (see my comment).

RamblinRover Luxury-Yacht > desertdog5051 06/01/2015 at 17:15

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I did see your comment. Didn’t realize the HD used a KeiHin, that’s interesting. I still generally prefer a floatbowl carb, but VV carbs are attractive in their own right.

Racescort666 > desertdog5051 06/01/2015 at 17:16

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I ended up getting mine from Rocky Mountain MC.

desertdog5051 > RamblinRover Luxury-Yacht 06/01/2015 at 18:14

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They have been injected since like 99, but my bike is older and uses a carb. The Keihn is by far the best carb I have ever had on a bike. It is easily modified and makes a lot of power and super easy to work on and gets good gas mileage.

desertdog5051 > Racescort666 06/01/2015 at 18:16

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Never used them. But OEM is good no matter where it comes from.