"Revolutionary Mikuni Carb Kit Transforms Honda CB550!"

It's been a couple of weeks since we did the Mikuni Carb upgrade from Speedmoto. This CB550 is a kick in the pants to ride, This carb upgrade has made the difference.
Visit speedmoto @ speedmotoco.com
The jetting on the 550 is Pilot #25, Main #160
Please Like, Comment, and Share. Be sure to Subscribe for future videos, Don't forget to hit the bell icon for notifications.
Follow on Instagram: / motorcyclerwind
#vintagemotorcycles
#mikuni
#hondacb550
#speedmotoco
#motorcyclerewind

[@davidsnow2420]

I bought a stock 1975 CB550 last summer. It had 18,000 original miles, zero rust, and the 4 into 4 exhaust. It ran and rode great until the fall. I barely made it home after a 40 mile ride--- the bike was bogging and stumbling and barely revved to 6 grand. I figured the carbs needed a rebuild. I discovered your video on Murray's Carbs and bought the newer kit with the manifolds that bolt directly to the head. My mechanic installed it this week and I've been riding the bike the last two days. IT IS SO GOOD!!!! The Honda rides like a brand new machine---- throttle response is immediate (even with the minor cable slop) and the bike just wants to rev. I still can't believe it. I really want to thank you for your video. The only problem encountered on the installation of the solid manifolds was that the nuts required clearancing. My guy didn't want to risk grinding on the manifolds so he shaved each nut til they fit. Murray's is a great alternative to rebuilding the stock four Keihins. Thanks again!

[@motorcyclerewind]

Thanks SO MUCH!!! Dis you have to modify your battery box. Thanks for watching.

[@davidsnow2420]

no battery box mods @@motorcyclerewind

[@robertmoffitt6904]

Man I love your video..I can't stop watching it... it's so good 👍

[@motorcyclerewind]

It's sooooooo good!... lol

[@ComboPixels]

haha the trust of that zip-tie/hair tie/ elastic holding your phone is immense ! awesome ride

[@motorcyclerewind]

😂🤣that’s because I grew up watching MacGyver! Thanks for watching.

[@FeebleDaddy]

Mine just came in for my cmx450 can't wait to put them on!

[@motorcyclerewind]

Let us know how it goes.

[@FeebleDaddy]

@@motorcyclerewind needs a little tweaking with the idle but it rips now!

[@motorcyclerewind]

@@FeebleDaddy I rode it with a screwdriver in my pocket for a bit to get it dialed in.

[@FeebleDaddy]

@@motorcyclerewind yeah I noticed they like a higher idle speed, I don't have a tac so it's kinda just by ear

[@drakeb6168]

Just bought a kit from Murray for my cb650 nighthawk. Can’t wait to take her out even though it’s like 30 outside

[@motorcyclerewind]

Awesome. Should go well. Thanks for watching

[@R2D2trashcan]

Hey how did you go with the kit on your CB650? Ive got a '79 and considering getting them instead of having the stock carbs rebuilt.

[@wg3191]

Sweet , as I watched the vid where you installed the carb kit. Wish there were open roads like this where I live but unfortunately I'm in the big city 😵‍💫

[@motorcyclerewind]

W G We are pretty fortunate to have these roads so close to home.

[@eduardocb550fourgavim2]

Muito bom!! Gostei, adoro essas máquinas !! Mas uma solução que somos apaixonados pelas Honda four!

[@motorcyclerewind]

Thanks for watching

[@3-DtimeCosmology]

Nice bike, sounds good! 😎

[@motorcyclerewind]

Thanks. This is one of my favorite. bikes.

[@jasonscott5932]

I have a question. Is it any good?

[@motorcyclerewind]

It's so GOOD!!!😂

[@NumberMyNumber]

Any idea on how these carbs compare to the Murray kit? The intake runners are shorter but the carbs are the same. Its also a $150 difference in price. Thanks!

[@motorcyclerewind]

Sorry for the delay in responding. I am in the middle of a 3,000 mile road trip on my 83 Kawasaki GPZ1100. Carbs are the same. I have used sets on a 350, 550 and 750 and happy with results on all.

[@lexblok]

Thanks for the video. I made a video myself ones of me accelerating on my CB550K3, with the stock carbs but I don't really see much difference. It is also as fast and going through all gears untill 9500 rpm and back to (i think) a nicer idling (more steady, not the taktaktak - sound) I 'm curiuos if this set is really better than the stock keihins.

[@motorcyclerewind]

Post the link I would love to see it.

[@preez77]

it's not better. Equal at best. Simpler for sure compared to 77-78 PD carbs. His idle is rough because the 2 carbs are not synced. One set of cylinders tries to run faster than the other set.

[@WesDimond]

Just completed my swap and your videos were very helpful! I can see why you reacted the way you did... Wow!! It feels like a new bike. The throttle response is incredible and theres a noticeable difference in power (according to my butt dyno). Very happy overall! Air screws 1.5 turns out Main 160 Pilot 25 Have you made any adjustments since? I notice a little sputter when revving at low RPMs, but not when there is a load on it. It's smooth throughout the power band and I don't have any cracking or popping.

[@motorcyclerewind]

I haven't done anything more to it. When the spring gets here I plan on spending a lot of time with the CB550!

[@treyvader]

If you up your camshaft a bit it will be even better more lift more duration = more power

[@motorcyclerewind]

That sounds like a project for the winter.

[@speedmotoco]

Love it!! 😊

[@motorcyclerewind]

Best carb kit on the market @speedmotoco

[@tim.iteland.9447]

Owned one and did 15000 miles in 2 years in the UK , still miss that feeling . Top speed circa 115mph . But the way it got there was fast . Cam chain sounds noisy . Mine seized & that's what killed it for good .

[@motorcyclerewind]

Thanks for watching

[@ASMCartoons]

Thanks for the video, there's not a lot of info out there for this setup. A couple of questions for you if you have time: Did you have to sync them? What's the procedure for setting the idle if they're not connected? Also, I've heard the choke is tricky because it's two choke levers, is that your experience? Thank you!

[@motorcyclerewind]

I did not sync them. If you watch the install video, I just put them on. As for as setting the Idle, I screwed them in counting the turns(like an air fuel screw) so I could get a baseline. Then adjust 1/4 turn each at a time. There are two choke levers not a big deal. Actually, now that I have have been running it, haven't had to use the choke. Check out the other videos I have in the CB550 playlist.

[@travisshrey6720]

The two chokes are easy enough to use, I usually set each to 1/2 way and it just fires up. Turn them off after a minute of fast idle at 2500 rpm. If you want to sync them correctly you should use a carb sync tool on the outer two runners and move the idle screws until you get the idle speed you want and they both read the same vacuum. Then give it a little gas so it comes off the idle stop and check vacuum. If they are different you adjust the housing screw on the top of the carb under the boot. A word of warning if you are troubleshooting, the inner cylinders run a lot richer than the outer at idle, so the header pipes will be 100 degrees hotter on the outer ones. That is normal.

[@GrandFathersCrutch1]

This 550 seems to be running great! Are these modern carburators or where did you get them from?

[@motorcyclerewind]

I bought the Mikuni VM34 kit from SpeedMotoCo.com. I have an unboxing video and an install video.

[@GrandFathersCrutch1]

@@motorcyclerewind thank you for your answer

[@RustyStator]

What did you end up doing with the vacuum lines that run into the original air box? If I remove the air box I have idea what to do with those

[@motorcyclerewind]

My CB550 was missing the stock air box when I got it. Just had pod filters. I believe you are referencing the vent tube that runs into and out of the air box. #17 an #22 in pic in link images.cmsnl.com/img/partslists/honda-cb550k-1978-usa-air-cleaner_bighu0056f4316_30fd.gif If those are the ones. New longer hose and have it end in same spot near chain. Hope this helps.

[@RustyStator]

@@motorcyclerewind you're a life saver! Looking forward to your next video mate💪

[@skandix]

Sure the 2 are nice, but I don't think you could beat stock carbs.

[@motorcyclerewind]

I am normally a keep it stick kind of guy. This was something I wanted to give a try and it was pretty easy and straight forward. Thanks for watching.

[@jamesa6272]

I bought vm30 carbs from speed moto co. Had to rejet them for my rebel 450. Had to bump the main jet up to 175 from a 165. I have a 1/4 throttle surge but not sure if that’s from a intake leak at the boots. The boots came with the kit but they are leaking. Not sure if I can even tighten the clamps any tighter. Bike runs good besides being alittle too lean even though I have everything set to be rich. Going to see today if the problem with the surge is the boots or not. It’s easy to rejet but just annoying after the 4th or 5th try at it. Is your bike running lean with these carbs? Do you have color on the spark plugs? The bike idles and revs good at 1/2 turn out of the air screw which is weird. I went to a 27.5 pilot from the 25 they had in. Seems to be okay. I really think I have a vacuum leak though which is throwing off the jetting.

[@motorcyclerewind]

I would reach out to the guys at Speedmoto. They are wizards and super helpful. Will get you sorted.

[@jamesa6272]

@@motorcyclerewind I have been talking to them. I tightened down the boots. Seems to be okay. The bike runs good now. The surging seemed to get better when I messed with the air screw. Only thing I’m afraid of is the bike might be running lean according to the spark plug color. I research different spark plug charts and info and some say different info. It’s starting to get annoying. I really don’t want to blow up my bike if it is running lean.

[@huutee1]

is it good?

[@motorcyclerewind]

So good! Thanks for watching.

[@HDkillerstar]

Keihins suck, Ive messed with them so many times its unbelievable. Rejetted 50 times, still bogs and what not. I think Im gonna go with Mikunis

[@karlvanboxel561]

It’s So Good!!😂

[@motorcyclerewind]

😂😂😂So GOOOOOOODD!!!

[@ianbestor1528]

Had a 78 CB750K from '10-'12 before then it was stolen. Those CB motors always sound like they're running completely unlubed to me, just a real dry sounding cycle. I'd check oil constantly because of the cycle notes.

[@motorcyclerewind]

I have never heard that description but it checks out.

[@ianbestor1528]

@@motorcyclerewind Don't get me wrong, I absolutely loved that bike and yours is a beaut too. I would buy one again if an opportunity presented itself. My nickname for it was actually called the "Rocket Cougher". Just a dry, scratchy idle.

[@jacob14163]

Has it effected mpg at all?

[@motorcyclerewind]

Haven't done a MPG test.

[@gerberfx]

PD carbs(550 K3 Originals carbs) are a nightmare, the best option is fit the 069A 550 Four carbs

[@motorcyclerewind]

Thanks for the tip.

[@darkshadowsx5949]

yeah the PD46A carb jets clog up and you have to resync them every 3 feet. taking them off and reinstalling them is a nightmare of its own. you got 4 orings flying everywhere and 3 control cables to fight off like a kraken. you also have 8 nuts to loose in the grass and the carb bodies are so soft you have to let grandma handle the screws or you're sure to strip them. i had to do thread repair on 8/12 of the screws. i paid some "seasoned motorcycle mechanic" to fix my carbs and that was the worst mistake i made. he stripped out 6 of the screws. 2-3 were striped by the ebay seller before hand so he retaped them to a larger thread size like a complete moron. he made a poor attempt at soldering a cracked overflow tube and he had the audacity to charge me $80 to mess my carbs up more. if i wanted them messed up more i could have just hit them with a 3lbs hammer and called it a day.

[@davidaames8787]

Anyone think this kit is so good ?

[@motorcyclerewind]

Take my word for it It's SO GOOD!!

[@MaryK4242]

Laissez les bon temps rouler!!!!

[@motorcyclerewind]

Yes sir. This was a fun project.

[@POWERBOUZOUKI]

Lol is soooo gooodddd

[@motorcyclerewind]

So good

[@Chalado-Schamane]

I daily drive no speedo

[@motorcyclerewind]

I just have a little OCD!

[@G58]

So disappointed. You gave us no indication of how good it was. 👀🧐😎😜 Peace For all those who had a drink every time you heard “SO Goooood”!! 😂

[@motorcyclerewind]

LOL!!! It's so good... Drink!!!!

[@G58]

@@motorcyclerewind I fell off my bike. I’m suing you for sure!!! 👀😂😂🧐😎😜

[@airdromeaccount7922]

yeah but is it good?😂

[@motorcyclerewind]

Soooo GOOD!!!