XS650 Mikuni VM34 Carb Swap & Setup 

Awesome video. I have an XS650 that I put back together with VM34 carbs. I did a lot of research online and found that a lot of people were running roughly this setup: Main Jet - 180 - 190 Pilot Jet - 25 - 30 Needle - clip position - 6F9, position 3 (middle) Needle Jet (emulsion tube) - P-6 (richer) P-5 (leaner) Cut Away slide - 2.5 Air Jet - None Float height - 25​ Air mixture - 1-1/2 turns out. Hopes this helps someone as well. Its not perfect, but its a great baseline to adjust to.

I just want to say I've been watching all of your videos as I just rebuilt my 73 tx650 and they have all been super useful!!! These videos you are posting are GOLD. Thank you so much!

Amazing. I just put VM34s on my XS650 this morning. For me it was a big improvement but I still need to further tune my carb’s a little bit, but much more responsive than the BS-38s. As always, amazing video and thx for the info!

Great video. Good content, no waffle. I'm about to rebuild a stock '75 xs650 that needs a lot of love. I have a set of vm34s from another build that I will now use thanks to your video. All the best for your channel. Cheers, mate.

I have a Mikuni VM 38 on my 83 FXWG. Was lucky my throttle I had for the 38 Deloroto pumper was the same! Had a Mikuni on my 80 Sportster and liked it. Thanks for the post.

Great carb info. I cheaped out and replace my originals with Oko's. It ran great for about a day. Went back to originals. I may try again with the keihin knockoffs next summer. Your video may have changed my mind. Thanks

Nice work, been struggling with my stock carbs, now I’m thinking about swapping to these!

Nicely done! Enjoying your content B-)

Keep up the good work mate!

Another awesome video mate

Great video and bike ,hope you made swing out of that back tire!

Hey Brodie, nice work and as the owner of a couple of these magnificent machines I really enjoy your content. Try raising the fuel height in the float bowls by adjusting the floats by a poofteenth as that might cure the flat spot.

Legend!

Nice video makes me more interested in XS650 ..i tried to find Xs650 that for sale but no avail,i guess i like more the standard than the special..

I have a set of VM's to fit. This is a helpful video. TBH I dont think you need to do so much speeding up, normal speed would be useful and although the tuning process is slow and boring hearing your analysis after changing each set of settings (idle, main jet, mid range) would have been very interesting.

I have wanted an xs650 and am considering getting one so I am doing a good bit of research on them. I have never had a vertical twin . However I keep noticing the vibration doesn't "look" as bad as some people say. Did you have your crank rephased?? I am a harley person and don't mind a little vibration at all from my sportster at all. In fact I like it but I am curious about the level of vibes on the yamaha. I am 57 years old and when I was young motorcycles still had lots of character which is why I am interested in the yamaha.

Hi there! How many turns out were you at with the idle screw? Please and thank you

Very good video and useful, could you please tell me where I can get the carburetors kit like this? Thanks in advance

Did you do a Dyno run with fuel air ratio check at WOT When I run a 180 jets I’m rich 210 would be extreme

Hi Brody Interesting you can use a 210 mJ What are the other components Needle jet ? Needle ? PJ ? Slide ? Did you check your colour of plugs with 210 MJ you better carry a spare set of plugs.

Hi. I’m just about to fit a friend’s 34’s to my xs650. What idle jet size did you start and or finish with. I’m thinking of starting with 15 and going from there. Thanks.

Put one of these kits on my ‘81 special about 2 months ago. Found adjusting the air mix screw made no difference where I put it Did start to produce smoke out of left cylinder, so have stripped motor and am now rebuilding it , so haven’t had a chance to really try the carbs , only did about 10 is on them it. PS where abouts are you located?

Hey there, could you tell me the size of the needle please. You said you put the clip on the second slot but not sure what needle it is. Thanks!

What happens to the centre breather hose when moving from the oem air box to pods ?

i have an en500 cruiser with er5 engine cv carbs giving me real problems thinking of going dual vm34 idle will not stay stable no matter how much i balance tune valves etc

I have these exact carbs I want to swap on to my Vulcan 500(kawi en500) not sure if y'all got that cruiser. Trying to learn about it so I can finally put them on.

So you left the carbs the way you got it and it worked fine?

if you could tell me the throttl ecables and throttle ass. you used that woul dbe great!!!1 i cant seem to find the right ones

I adjusted the carbs, but if I want to turn the bike with chocke, dont function I need to oppen the screw, after the Idle will go 4000 rpm,, next I turn down the screw,bike run normaly, what can cause this problem

I have a question how do you setup two single carbs to work for the one bike I am confused how to bridge them together to work simultaneously

Which tubes/hoses are for the fuel?

Hello, I have a vm34 but it leaks, it's not the float level, maybe the needle seat it's worn out, does someone know how to fix it?

My 74/75 idles a heap lower. Not that its an ideal setting for good power pull

Extent,...

Those air filters are garbage, mate. The UNI pods will give you far better throttle response (especially when you give it a fist full).