How to CONVERT your XV750 [Virago] to single CARBURETTOR | Mikuni TM38 Flatslide | 

Oh okay cool! Can I ask why you want to go to the single carb? Similar reason to me?

Thanks mate! Much appreciated! Good man! You won’t be disappointed!

Hey mate, no problems at all. Yeah look, I have had limit time on it with the single carb. Basically a few hours of tinkering on a day off. Since I made this vid I Havnt been on It so I’ll have to get back to you on that one! But yeah agreed, the twins would be much better power wise etc. but this bike is going to be a highway hog so I want to simplify it so it’s easily adjustable on the road. The twins are just abit cluttered. I suppose once they are jetted right you shouldn’t need to change anything apart from routine maintenance.

Thanks mate! Much appreciated. Yeah I agree, very clean install. I think stick with twins. The single has been abit of a headache for me. If you watch my most recent vid you’ll see what happened. Needless to say, back on the twins now. I may revisit the single if I feel motivated again haha

Yeah the best way to learn is tinker yourself! Great bikes to do so aswell. Parts are cheap and plentiful!

Yeah absolutely. Honestly my twin VM34s work so good that I can’t see that I’d go to a single on my cafe racer anytime soon. I sold the bobber a while back unfortunately 🥲

That’s exciting! Should rip with that on it

Yeah beautiful. I have twin 34s on my xv1000 with 750 heads. They are great. They’ve been on the bike since it was a 750. Just had to re jet it after the changes and modifications along the way.

@@mattfranco8715 What was the maximum speed you had with the double mikuni vm 34..? Is it worth ordering and I have a virago 750?

Perfect, thanks Matt

Haha, bloody oath. Mate before ya order do some research on the manifold design, I had dramas trying to tune it.

@@mattfranco8715 I Heard about that, I read on the forms somewhere that if you get the round slide version it’s better, not sure how valid that claim is but I’m giving it a shot

I bought this kit My vt750 was running very bad I bought carby kits for the twin carbs They are a pain to remove and replace . Still ran bad so got the single kit took only 40 min to install . The bike started instantly ran good backfired when I turned the throttle so I put a bigger jet in did not have to take the carby of the bike ran good at 100kh it backfired once so put bigger jet in and runs sweet had it up to 130kh no problem Very happy with it

I mean, the pumper is probably the better choice. But for me the 38 will be fine I think. If you’re not in a rush I’d hang out for the pumper

@@mattfranco8715 I'm not in any major rush, I think the pumper would be better, but unsure if it would be better enough to warrant the extra chunk of cash

The kit is a VM36 round slide pair with throttle cable, manifolds etc. link in the description now 🤙🏼🤙🏼. You’re welcome!

Yeah that’s my worry too. The cylinders will always burn differently I just hope they aren’t too different.

@@mattfranco8715 I think it's almost impossible to adjust them that you have enough power in the low, mid, and end range. That's why I prefer my two Mikunis, even when I have to pull them again. The front cylinder gets flooded, and the valve of the front cylinder's carb must be hanging sometimes. The problem is that it happens sometimes. God, I had them working well for four years after a good rebuild by myself. Now perhaps the O-ring of the valve seat has decreased, I have no idea. Every time I order something from the US, like a K & L carb kit, the shipping is sometimes more than the product. Ride safe and stay healthy!! Greetings from Thailand to all bikers.

Check valve clearance first. Then if the cylinders aren't firing properly check for intake manifold leaks or bad plug. If one plug keeps fouling put in a hotter plug presto

Hey Paul. No sorry, as far as I know they don’t. But have a look on their website mikunioz.com

@@mattfranco8715 KJS does

Bike from the Brink has made one for my 535, just waiting for it to arrive, been told a PWK34 carb is what i need now

Yeah great value I think! Such an easy kit to install and get running quickly. Yeah I think it may be an issue. I’m not sure that they send stuff internationally. They are based in QLD and serve Aus but yeah I guess an email couldn’t hurt.

@@mattfranco8715 Got a bud that lives in Melbs , may go down that route . he also has an XV 750 se :-) ill give it go .

MikuniOz do free international shipping on purchases above 500 AUD. I'm also in the UK and trying to decide on one of these kits

Bro I'm having the same problem

Do not open the kit? Sorry, not sure what you’re saying really. Habla usted Ingles?

Someone elaborate. I have a xv700 with a very similar issue. For one I believe it is clogged. Get a new valve or clean it then get ready to mess with your carb a bunch.

Recommend watching the second episode of that series. I had issues tuning it. One of the cylinders was being prioritised over the other. I put it down to manifold design. I still have that kit sitting in a box in my shed haha. Ended up converting that bike back to twin carbs but I used VM36s

Hey, the jets mine came with were 22.5 pilot and 230 main.

@@mattfranco8715 Thank's !!

Hey there, the 750s never came with a pump as far as I know. So yeah I never had one.

That’s good to know! I have a couple of those carbs in my spare parts bin. I’ve since sold that bike. But I may try a single carb in the future on my cafe racer! Thanks so much for the comment and for watching my videos :)

I’m very tempted to try another single carb setup on my cafe racer, but with a KJS manifold.

@@mattfranco8715 This will work, 100%. I ride it since over 10 years. And it runs better than Stock. If You like take a look at my ride.

I did not have great luck with the manifold that’s for sure. If I was to do it again I would order a KJS manifold.

@@mattfranco8715 yeah, saw the other vid. what main jets do you run in the twin VMs? I'll give the single a go, if I can get it running and If I'm not happy, I'll just buy a second VM 34 and go for twin.

Yeah fair enough. I guess it’s not something that will make any difference for what I need it for. My roundslides are amazing.

Same to you

I just deleted all that :)

I think I changed the valves to just manual on off petcocks.

Thankyou! It’s a custom exhaust that I built. :)

@@mattfranco8715 Nice! looks great man.

Thanks Jennifer!

100% it can be.

I built them :)

My bike came with a custom single stock carb I don’t think I can jet it so this is definitely in my eyesight is there any way you can do a video tuning the carbs ? I have no idea how

They are all overflow drains. Prevents the carb from filling your cylinders with fuel.

Yeah no problem I can do a vid! I was planning on doing that anyway tbh. I’m having some struggles with the single so I’ve got to do some more testing etc. My computer is being diificult that’s why I Havnt posted any more vids atm. Mikuni make it pretty straight forward tuning wise and include a step by step explanation on initial setup. Thanks for watching and commenting!

Matt I have two throttle cables how did you install those or did you add them

@@ogscratch9496 hey mate, you should have a single throttle cable for a single carb

Mikunioz.com

Everything is included when you buy the kit from Mikuni Oz.

MikuniOz are nice folks very helpful but my manifold did not come with a boot “spigot adapter” it does have the 2 boots for the cylinders. I made one that should work. There are rejetting recommendations out there with guys claiming to have great performance with the BST40. Fingers crossed.

Max speed? Don’t think I’ve ever maxed it out. I probably never will. If I have to order a set of new carbs for my wife’s bike they will definitely be VM34s. I love these carbs. So easy to adjust, everything is accessible unlike the VM36 kits. I’ve got the 34s still on my 1000 and it rips!

22.5 230

I was honestly worried about that too. It was less of an issue than I thought though.

That is a Mikuni TM38 Flatslide Carb

I was going for simplicity honestly. I wouldn’t say there would be any obvious advantage other than less moving parts.

Half the parts and no syncing needed. For simplicity and ease of maintenance this is a great mod, assuming the manifold issue can be resolved.

Yeah the carb kit will still work for your model.

Sorry, I deleted my comment, got confused for a second there. This was the single carb conversion so you get a pod filter for it. So I ran the pod while it was single carb. Later I just bit the bullet and ordered twin VM36 carbs and fitted those and retained the standard air filter housing.

@@mattfranco8715 I have an xv700 that was single carb converted before I bought it. Can you give me a link to where I might buy an airpod so I can give it a chance before I give up and get a set of carbs?

Oh okay nice. Yeah I buy my stuff from mikunioz.com

@@mattfranco8715 thank you!

Sure did :)

@@mattfranco8715 Did this set up really start as easily in the video been having alot of carb trouble with my 82 virago and am thinking about buying the kjs manifold

How did you go with it? End up sorting it out? Does it backfire loudly or puff out tonnes of unburnt fuel soot? Does it start if you give it throttle?

@@mattfranco8715 do you have Facebook ?

Yeah both are the stock XV750 wheels just painted

Yeah that carb setup is used on 750-1100. You just specify what you have and they pre jet it accordingly.

@@mattfranco8715 I have my brother's old bike. It needs the carbs cleaned anyway. So maybe I'll do this instead.

I honestly reckon it’s all to do with manifold design. I’m keen to try a KJS manifold in the future on my cafe racer.

I have a KJS System with a Mikuni Flat TM40 on a xv1000 from 1985 US Model. It working perfekt from idle to 170Km/h. I love it.

Yeah that would the go. I’ve still got my TM38. So I’ll look at buying a KJS manifold one day and seeing if I can make it work. I love my VM34s but!

I agree. Simplicity is what I was after, but I ended up with 1 cylinder being prioritised over the other which was fouling plugs like crazy. I put it down to manifold design. If I was to do it again (which I most likely will) I will be fitting a KJS manifold.

@@mattfranco8715 don't bother... Been trying everything to fine tune my single carb setup and its just not the way to make it reliable ... Yes more torque at the bottom but Sparkplug will always end up fouled.

Very nice! Great bikes 😍

Honestly couldn’t feel a difference in outright power and the bobber wasn’t really about power anyway. It actually surprised me how much power it did have on the single carb. But all that was over shadowed by the issues I faced.

As in the standard airbox and the fake cover? Yeah they look pretty sweet but I preferred the simplistic look tbh.

Yeah absolutely, the single didn’t stay on this thing long at all. Ended up with twin VM36s

Or get this: Turn up the idle screw.

Haha, I made a second video on it. Couldn’t get it to run good. I put it down to the manifold design. It was fouling the rear cylinder

@@mattfranco8715 thier is a lot I would like to say but just can't it doesn't work and that's enough for me if anyone else thinks they can do better I have a 1992 that we can try it on you pay all the installation cost

The look and to simplify the bike

I think I explained it on my video pretty well. I was after simplicity. I didn’t care about outright power etc. the bobber was always going to be a camping, cruising bike that I could fix easily. But I guess to a degree I can eat my own words because it was NOT simple to tune. I still blame the manifold design but never confirmed it.

Yeah mikuni Oz later confirmed that. I fiddled for awhile and fouled a bunch of plugs but the manifold 100% prioritised 1 cylinder over the other so multiple issues. I’ll try a single carb again but on my cafe racer I reckon. But this time I’ll design and fabricate the manifold myself.

@mattfranco8715 if you turn down the accelerator pump a little and adjust the accelerator pump to spray even between the cylinders it will make a big difference

@@cleancutstudios that carb didn’t have an accelerator pump.

@@mattfranco8715 Sorry about that. I thought that it did, but that's how we do the T M 40-6