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Author Topic: XS 750 brass venturi-Carb gurus chime in please  (Read 592 times)

Offline der_nanno

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Re: XS 750 brass venturi-Carb gurus chime in please
« Reply #10 on: Sep 03, 2018, 15:04:50 »
I told you you may want to play around with lengths. Also it could be that he has to shorten them as he can't stretch them enough... That being said, in order to make the most of the stacks, you should consider a good exhaust.
Real freedom starts with the freedom of thought.

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Offline TranceMachineVienna

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Re: XS 750 brass venturi-Carb gurus chime in please
« Reply #11 on: Sep 11, 2018, 06:26:37 »
So I started cutting down the brass venturis.
I have an idea to use a 3d printed adapter piece to make up for the gap and optimise the air flow to the carb.
Maybe I let it be made out of metal later but for now it will be 3d printed.
I have a friend with a 3d scanner. I will scan the carb mouth and 3d model the adapter into the 3d scanned piece.

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Offline XS750AU

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Re: XS 750 brass venturi-Carb gurus chime in please
« Reply #12 on: Sep 11, 2018, 08:50:05 »
Coming in a bit late, as you have cut them!  :o
When I made up the filter assembly for my XS896, the "ram tubes" were made the same diameter and thickness as the inlet side of the Mikuni carbies so there was a very smooth air flow. The filter side of the "ram tubes" was then expanded to swage it into the filter tray. To hold the "ram tube" to the carbi I used 60mm ID silicon hose and hose clamps.
The system is working very well.
Unfortunately you have cut the cups so there is a step transition between the end of the brass cup and the carbi inlet. Do you have any more cups? Simple is usually best, hope this is some help.
“Engineering is the art of being approximately right rather than exactly wrong.”

Yamaha XS750-2D
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Offline TranceMachineVienna

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Re: XS 750 brass venturi-Carb gurus chime in please
« Reply #13 on: Sep 11, 2018, 08:59:16 »
Looks killer you're setup!

I have no other cups but I will try to make them work.
The 3d printed adapter will make up for the gap and smooth out the airflow hopefully :)
And there is the idea to insert a ring that holds in a fine mesh too like in this pic.

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Offline der_nanno

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Re: XS 750 brass venturi-Carb gurus chime in please
« Reply #14 on: Sep 11, 2018, 12:29:42 »
Mesh looks good but will completely ruin the airflow.  :(
Real freedom starts with the freedom of thought.

My Blog:
http://greasygreg.blogspot.co.at

My Mule TR1.1 build here on DTT:
http://www.dotheton.com/forum/index.php?topic=75458.0

My Turbo TR1.1 (XV1000) build here on DTT:
http://www.dotheton.com/forum/index.php?topic=72571

My XS Triple Sidecar build here on DTT:
http://www.dotheton.com/forum/index.php?topic=74211

Offline teazer

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Re: XS 750 brass venturi-Carb gurus chime in please
« Reply #15 on: Sep 11, 2018, 14:38:23 »
Ryan,

I know you are looking for the brass look, but why not start with the stock connectors to the airbox that the carbs came from.  That will at least give you dimensions and length to work from.

Alternatively, see if Steel Dragon can make some to fit those carbs. http://www.steeldragonperformance.com/products_2.html

I have a set on the Phat Trakka that were made to fit an XS650.  Mine are Alloy, but they do brass as well.

http://pinkpossum.com/GT750/phattrakka2/images/DSCN0744.JPG


« Last Edit: Sep 11, 2018, 14:51:10 by teazer »