So, I am a mechanical designer and a 3d printing nerd. I'm seriously considering designing a single carb intake manifold that would be "drop in" for this bike and having it 3d printed in glass reinforced nylon. Coming from Shapeways, it should be relatively cheap, and I can print prototypes at home for testing. Anyone have a "dream carb" they wish they could bolt up to this bike? I've seen people talking about the mikuni VM38 a bunch, any other suggestions? This project will likely be a ways down the road, but you gotta start somewhere. I'm going to try to get a good 3d scan of the existing carbs to get my angles nailed down, but after that real development will come quick.
The Mikuni VM38-9 may be a good choice, seems readily available with soild aftermarket and racing support .
The VM looks to have a generous sized drain cap and accessible fuel bowl.
Striking a balance between the carb/air filter sticking out too far, and ready access to the choke lever, might be a challenge.
The carb/air filter protruding too far to one side is something that often makes a single carb conversion look a bit freakish.
Are there any, readily available/serviceable downdraft carbs? Would that layout be better or worse for this mod? A Motorcraft vacuum secondary 2bbl comes to mind, was used to convert some Goldwings for a while.
But think about the last time you saw a Ford Pinto.
I actually made my own single carb conversion im in the process of tuning actually. I bought some 1.25 od pipe from the hardware store, and a 40mm harley knockoff carb and am running it. The couplers are just 1 7/16 fuel hose from napa. The carb to intake manifold boot is the stock engine to carb boot just because of the angle it gives. My air cleaner setup could be a harley setup but I'm cheap and the bike had k&n filters in the stock cleaner "ears". I took some 1/8 stainless sheet and made a backimg plate same profile as the air cleaner. The air cleaner is attached with 5/16 stainless carrige bolts. With the setup it clears my legs with the forward controls. I am prolly going to extend my rear brake lever for comfort but not needed. I can try to get some pics and post them here is y'all want or I may just start my own thread lol. I'm still working on the tuning but I think itll be so,much better than the stock carbs.
As for choke I just used a harley choke cable and put a bracket on the frame under the tank on the left side with a hole for the choke.
So heres what i got, ive got some tuning to do like i said before, the throttle cables im using the stickers and trimming them to fit. Some new barrel ends for the cables are on order, once tuning is com0lete im pulling it all apart again and painting my engine again, (fuel leaks take off paint real well), getting some black hose clamps, and putting it all back together. With the angle from the stock boot it clears my legs with the forward controls, and from where i belive the stock pegs went. A thinner air cleaner could be used but i had this k&n plus one more for a spare. With this setup the idle is about the same, i can already tell it uses more fuel, but starts so much easier, and throttle responce is right there. So far it runs better than the stock carbs even after the ear shave. Still need chome cable mounted, as well as removing the stock one.
Yea tricky with the pics lol. My front camera is shot so gotta take em with the reverse camera so i kinda got no eyes lol. I'll get some when i get the manifold off. Going to smoothe up some welds and whatnot then coat everything nice and pretty. I'm so fed up with the stock carbs that in doing a jig im so happy lol. Im actually on my second set of carbs before they took a crap. The center section that joins the carbs broke twice. If this didnt work I was going to try to machine a billit aluminum section.
I too am a 3d printing nerd. I did recently sell my Lulzbot Taz 5 but, will be getting an Ender 3 printer or 2, depends on how many I can sneak past the wife, lol
Hi i´m brasilian
i have one vn750 1994 with 22k miles
my dream carb is a quicksilver edelbrock 38mm and recently bought in ebay
i already tested with one koso 38mm one honda twister carb(250cc) and with honda falcon carb (400cc) and with both the bike has started.
any pictures in facebook group vulcan 750 riders
the carb is still coming to Brazil. When possible i ll send photos
tks
Evandro Miranda
Hi i´m brasilian
i have one vn750 1994 with 22k miles
my dream carb is a quicksilver edelbrock 38mm and recently bought in ebay
i already tested with one koso 38mm one honda twister carb(250cc) and with honda falcon carb (400cc) and with both the bike has started.
any pictures in facebook group vulcan 750 riders
the carb is still coming to Brazil. When possible i ll send photos
tks
Evandro Miranda
Thats pretty cool. How does it run? Is the fuel flow pretty even or is the rear running rich. I would imagine with the rear cylinder being closer it would get more fuel flow that the front?
Edit: Also have you got the mesurements and angels. If you do could you post them here. Im sure there are a lot of folk would like to build one aswell.
Ok cool. Let us know when you get it going. A video of it running would also be appreciated. Nice job so far tho. Takes a lot to actually dive in a make it.
X1 for myself as well.
My flaod got stuck due to some debris in the bowl. Took apart, cleaned, now, months later, its doing it again. I suspect the air valve on the side is the culprit, because it looked funky and sorta gummy.
Very cool indeed who I would rub to get rid of my stock carbs. Would make life a lot easier.
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