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It's a banjo switch, instead of a banjo bolt switch.



Let me help you find the hole. :D

Whoa! Source on those? Fucking awesome. Way lower profile and more attractive in general than either straight-out or 90 degree banjo bolt sensors. Lets you keep using your own hardware too if you don't mind drilling a little bit or having it made to work. Very Smoker.
 

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BLACK BELT
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6,926 Posts
Discussion Starter #1,583
I know there's some interest in the pressure banjos I'm trying out. So, here's a little more info.

The banjo bolt that came with the pressure banjo is the same dimensions as other banjo bolts I have, except for the length of the threads. This means that the pressure banjo can only go on BELOW the banjo.



It looks like the pressure banjo will be located over the THREADED portion of the banjo. Not sure it will work (well) because of this.

I would prefer to run the pressure banjo wire parallel with the brake line.



Because of the large switch housing, the only way it can be done is to use a spacer between the banjos. In this pic, there's a sealing washer between two standard banjo washers. Not a setup I like.

 

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BLACK BELT
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6,926 Posts
Discussion Starter #1,584
I ordered 2 of the pressure banjos from Langston Motorsports.🖕

They only sent me one. They ignored 2 e-mails about it. I called on the phone and was told they would send another one. Never did.

I opened a PayPal dispute to get my money back. Immediately, I got an e-mail from Langston that said if I cancel the dispute, they'll send another pressure banjo.

If I cancel the dispute, there's no opportunity to open another dispute on the same item. I said I would cancel the dispute when I received the second banjo.
Never heard from them again. Pretty sure they had no intention of sending another one.

Fuck Langston Motorsports!! Got my money back from Paypal. Ordered my shit elsewhere.
 

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BLACK BELT
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Discussion Starter #1,588
Dang it, Pete. That's stinks. Those are really cool looking switches, too.
Will probably use an appropriate angled banjo on the front.

I'm thinking of a different angled banjo, but the pic illustrates a solution on a similar type pressure switch. I think the pressure switch is on the wrong side of the banjo in the pic.



On the rear master, the hose is oriented toward the rear and the wire goes toward the front- so no issue.
 

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BLACK BELT
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Discussion Starter #1,591
Was thinking about this, so I found a pic to look at.

I may have made a mistake with my carb tubing. I connected the bowl vent tube and the bowl overflow tube with a "Y" connector.



Should be okay, unless the overflow tube drains fuel beyond the "Y" connector. Then, I think fuel could be sucked up through the vent tubing.

Will try to redo with both vent tubes into the same "Y" connector, and both overflow tubes into the same "Y" connector.

My guess is that the vent tubes also need to go to a vented catch can, in case the bike falls over.
 

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BLACK BELT
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Discussion Starter #1,592
Top of the float chamber showing the 2 vents that are open to air.



Why are there two vents, instead of one? I assume when the bike leans left, the left vent can get blocked with fuel- but the right vent will be open. With this setup, fuel should continuously flow by gravity into the bowl.

When landing big jumps the fuel can slosh up into both vents at once, causing the engine to bog. I think that's why Kehin came out with Quad Vents on larger PWKs.

The standard Keihin PWK 28 has two vent tubes, one for the left vent hole and one for the right. The KX100 Keihin PWK 28 has two vent tubes for the right vent hole and ZERO vent tubes on the left. The left vent hole is blocked.

The KX85/100 PWKs are setup for half the displacement of my engine. Because these carbs will be flowing a lot of fuel, my guess is it would be a good idea to open up the left vent.

Red and yellow are open to the right vent. Blue is blocked. Green is where I could put another matching port and have a one-off PWK 28 Quad Vent. Will at least be a Tri Vent.



Never heard of the blocked vent before. Only heard that the KX PWKs are such a bargain. Now, I know why they're cheaper.
 

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The friendly Ghost.
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I would be tempted to not bet on the pressures going through the threaded portion well.



Using a double orifice banjo bolt would be a much cleaner solution. Also, wouldn't be hard to modify your current bolts to have a double orifice.
 

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BLACK BELT
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Discussion Starter #1,594
I would be tempted to not bet on the pressures going through the threaded portion well.



Using a double orifice banjo bolt would be a much cleaner solution. Also, wouldn't be hard to modify your current bolts to have a double orifice.
Yeah, looking at designing a custom banjo.

Double banjo doesn't fit right because the banjo switch is much shorter than a banjo fitting.

 

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BLACK BELT
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Discussion Starter #1,596 (Edited)
I'm not sure it matters which side of the banjo the pressure switch goes on. It should see pressure anywhere it's installed in the system.
If the pressure switch is below the banjo, it's positioned completely over the threads, not over the cut out part with the hole.



If the pressure switch is above the banjo, the cut out part with the hole is almost completely occluded, and the washer is over the cut out, so it can move off center.



I'll do some testing, but I think custom banjo bolts are indicated.
 

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Breaking shit...
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3,205 Posts
maybe a dumb question, but does the maker of the sensor make a matching banjo bolt?
 
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