carb swap

no progress yet, but really considering it.

i want to swap to non cv carbs off like a cb 750... anyone done it?

 

The problem is finding a set that will fit your bike. The space between the carbs isn't the same on every manufacturer.
What bike do you have? Put that info in your signature so everyone will know.
There was an old post where someone put a Suzuki GSX750 rack on their XJ750, don't know what years. Some people have used the GSXR throttle bodies for a EFI conversion. Kehein CR rack has been put on a XJ. I did a 2 carb Mikuni round slide conversion that required making 2 into 1 manifolds and a few other mods. You could possibly put 4 round slide carbs on, but you would need to make the throttle and choke linkages.
All the above would take some time and planning. 8)

 

82 xj750.. I thought it was in my sig. Have to fix later. I have seen there they use throttle bodies, but I still want carbs. I measured a set of carbs at a buddies place the other day that were close enough I think would work. Not sure what carbs they were on, but it was a larger cc bike. Maybe 1000 ? Or a 900 not sure. Bike was just a parts bike. He's got TONS of parts bikes! Think I might get them and do a quick clean up and see what it runs like. Then re jet if need be, and let you guys know how it goes, and what they came off of.

 

Just curious. Why? CV carbs are about the best way to fuel an engine. Well set-up CVs are as good, or better than, EFI.

 

I put carbs from the 1982 Suzuki GS750 on mine. As Orange-n-Black stated, carb spacing is the bug a boo. It ran GREAT with the V-stacks but, not so healthy for the motor.
http://www.xjbikes.com/coppermine/displ ... pos=0.html

 

Thrasher please why not so great for engine? Is the slightly uncontrollable amount of fuel? Or that there just not efficient like cc's. I've heard damn heard no one have GREAT luck, or find a way to sufficiently tune them for pods, or velocity stacks. Which is what I am running. I have not tuned mine, but have done a few plug chops, and it doesn't pop or shudder or bog. Mines ok, just an anal bitch to get the idle set. Little lean under absolute full throttle. Bt I've had pretty good luck in tuning standard carbs before. And I figure if I find an alternative way under let's say 300 bucks, to gain some power, and loose the nasty air box, I'm sure more then just I would opt for that solution...

Not trying to stir a pot of shit either with the "keep it stock" guys

 

That actually sounds like it might be a good solution for you. The key will be finding a set of carbs that will match the cc/m of air that the engine wants. You can always fab a set of adapters if needed. Since you won't be connecting to an airbox, fitment should be a bit easier.

 

Your 750 came with 32 mm carbs so look for the same size and jet for your bike.
As for manifold boots(head side), lowbrow customs had some billet ones with rubber carb holders for the XS650, don't know if the flange will fit the XJ but the holders would allow some flexibility with the carb spacing.Check your manifolds for dimensions and call them for the dimensions of those. If they fit, you could probably put any carb rack on there.

 

These.

 

The reason it may not be good for the motor is, unfiltered air with dust, dirt and the occasional small child or animal getting sucked in the motor.

 

haha ok. i thought you were talking about the carbs in general, not just the stacks

 

well i ppicked up a rack of gs 750 or maybe 850 carbs and boots last night. might have some free time to mock up on spare motor. got to finish my bike for the weekend though. rewire lights, and install electrical box finishing things

 

By the time you make adapters you may not have room for air filters.

 

The adapters won't take any more room than the ones the engine came with. He ( I hope ) isn't making adapters to hook the carbs to the factory intake manifolds; he's making some to use instead of the factory manifolds.

 

Anything would be better than the Hitachi carbs that are on my XJ650. The problems with these carbs that this site talks about I am not surprised someone hasn't solved the problems these things have. Got my owners card fixed went to get it inspected. Put 2 gallons of gas in the empty tank. Got back and the tank was empty. Got 22 miles off of 2 gallons of ethanol free gas. Sad.

 

Stuck floats are not limited to Hitachi carbs. Carburetors are not maintainance-free components, no matter who makes them. Welcome to one of the many joys of owning an older vehicle

This has been a sarcasm-free post (really).

 

I consistently get 40 miles to the gallon with the standard Hitachi's which I think is not bad for this type of bike and the riding I do. the only people that seem to bitch about these carbs are the ones trying to run pods and stuff.

 

better drain your oil and check the float levels.

CN

 

A long time ago Shooter set up a set of carbs off a cb750 non cv i am not sure how it made out i believe he sold his xj and is no longer on this sight. I will look and see what i can find

 

Schooter managed to get run into a ditch within **JUST MILES** of finishing his Bobber. Didn't see Honda carbs on it tho
http://www.xjbikes.com/Forums/viewtopic ... art=0.html

He had a hand clutch on a jockey-shift for some reason.

Video from 2011 after the crash
http://www.youtube.com/watch?v=aSnjWNSxoLA

 

Thanks guys, I put cb750 carbs on an xj750. I went approximately 4 miles, bike quit, pushed it back 2 miles, and put on my CV carbs.

I now have a rigid Sportster and Shovelhead.

 

Are you all grown up now, Schooter ?

 

Perhaps; I see you're still a peevish bloke.

 

schooter old man, you still running that beet farm?

 

We don't use that word here, but if it means smart, intelligent & a seeker of truth, then you're bang on.

 

How do the gs750 carbs work on the xj650? I found the same set and was wondering if it was healthy for the bike to run the gs750 carbs on it. Is it good to slap on and drive?

 

My 82 xj650 carbs and all sorts of f***ed. I found this guy selling gs750 carbs on kijiji he states “plug and play” . If I were to buy those would it be fine to run how it comes?

 

The spacing of the carbs is likely to be different so they probably don't fit. I'm guessing here.
Rebuilding your carbs is the best path to take.

 

Do you know where I can find a rebuilt kit with the flouts and all that so I don’t have to do flout hight and stuff

 

just send a private message to @chacal here on the forum for any parts you may need.
Best to strip your carbs down 1st to determine what is needed.
You will need to set float heights regardless if you are replacing parts or reusing existing.

 

New floats does not mean no float height adjustment needed. Floats always need to be tweaked to get the right fuel levels. Most all of a carb can be cleaned, at least the metal body and jets. Other parts like the diaphragms, throttle shaft seals and fuel o-rings can be replaced.

 

Oh ok gotcha. I’m not sure what I’ll need the bike runs but the carbs leak when I turn the gas on. And #4 carburetor isn’t working. I took it apart but the 4th one had a broken slide

 

Leakage could be from gaskets, o-rings, float needles not seating. How is #4 slide broken?

 

Top of the needle the screw that keeps it in snapped right off so there’s nothing keeping it down. I think one of the floats is blocked by the gasket and it’s not closing. I’m gunna take it apart when I get home from work and check it out. Thing is I don’t know how to sync them enough for there to be enough gas for it to be able to rev. I open the throttle and nothing happens just keeps idling I’ve checked for kinks in the throttle cable and for the slides to open everything’s good just won’t rev

 

Does anyone know how the Murray carbs are? Just seen an Instagram add saying they have xj carbs. Wondering if anybody is running them

 

They are amazing I slapped a pair on my 82 650 maxim and it was worth the money.

 

Was it a pretty straightforward swap? I see they ask about your exhaust but it doesnt seem to ask about elevation.

 

They tune it before they send it to you so put whatever exhaust you have select it then tell them the information they ask for. The switch over is pretty easy if you’ve ever taken carbs off of ur bike and installed them before. The throttle cable it comes with you’ll have to take the one you have and put the one they give you. It’s already pre jetted for ur bike so it’s slap on and play

 

I see a recent post referencing "Murray" carbs. What are Murray carbs? Are they rebuilt stock carbs? Are they an aftermarket brand of replacement carburetor?

 

Aftermarket they are.