How To Synchronize Carburetors On The Honda CB350 & CB450

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Күн бұрын

www.common-motor.com/
This video shows the two-step process on how to perform the proper carburetor synchronization on the Honda CB350 / CL350 / CB450 / CL450 and CB500T family of motorcycles.
Step one - setting the idle speed synchronization, aka "bench sync."
Step two - adjusting the progressive synchronization, which means having the carburetors open and close at the same rate when the throttle is twisted.
New throttle cables and a throttle sleeve ensure smooth and proper synchronization.
CL / CB350 Throttle Cable: www.common-motor.com/honda-cb-...
CL / CB450 / CB500T Throttle Cable: www.common-motor.com/honda-450...
Nylon Throttle Sleeve: www.common-motor.com/honda-thr...

Пікірлер: 77

@RapscallionStallion 8 жыл бұрын

Fantastic videos. Just dug a '72 CL350 with 7,000 miles out of my Grandpa's garage. Been sitting there 39 years. I got her running and am now ready to tune her up! Thanks for the videos. Please keep 'em coming.

@brashkov 7 жыл бұрын

Building a cb350 this year, and a noob to boot. This video was very well done and much appreciated. I will be sure to watch the rest.

@johnsonspeedfab 8 жыл бұрын

I just wanna say I love everything you guys do. You live and breathe classic Hondas. I've found your channel and as well a your site very helpful with my CL350 build. I bought a valve set from you guys a while back. And I just want you to know I appreciate the convenience.

@johnsonspeedfab 8 жыл бұрын

I've found it hard to build these bikes on a budget. But I'm only 17. Ha ha.

@pegasusjackets 3 жыл бұрын

Another great video. Thanks guys. This is precious resource for my Honda CB 450.

@TheGoatMumbler 8 жыл бұрын

You guys do awesome vids on these Honda's. Keep 'em coming!

@thetigertard 2 жыл бұрын

Just bought a 450c, gonna need to be rebuilt so it’s good to know it’s this simple to sync

@donaldcohen4453 Жыл бұрын

Brenden, you the man. Thanks for another great video series.

@georgebone23 2 жыл бұрын

I have a 1973 CB450k6 that's been popping..that was the fix! Thanks friend!

@waiheke109 2 жыл бұрын

Just followed your helpfull tips and carbs now working perfect thanks

@GaryT1952 Жыл бұрын

So well explained...and here I thought it was some kind of high-tech mystery zen procedure. Thanks for setting me straight

@davidrennicks2484 4 жыл бұрын

Yes ! Very well delivered and very useful . Good stuff.

@JM-sb4nb 2 жыл бұрын

Thank you for the clear descriptions. Good movie.

@revdirtymind 4 жыл бұрын

Great information. Very helpful. Thank you.

@utahnick 8 жыл бұрын

Excellent video! I just picked up a 74 cl360 and plan to overhaul it. I've never done anything to this extent, but am good with a wrench and have tools. I really wish someone could walk me through ordering parts, any help ideas? Thanks again!

@quikkyle601 6 жыл бұрын

Thank you for these!

@andrewtitus3944 5 жыл бұрын

Great videos and a great on-line store, too. Thanks a ton.

@glennhuntiv2704 5 жыл бұрын

Andrew Titus they have a on line store?

@TheCaffeineRacer 7 жыл бұрын

great explanation and clear video thanks

@Zairn12345 3 жыл бұрын

Thanks! This was really helpful!

@larryray4627 8 жыл бұрын

Thanks for the help. Larry

@maxnylen3429 2 жыл бұрын

What a great video! Good job

@y3034 4 жыл бұрын

Great video But there is not any other screw to adjust like air flow or gas?

@josephromero81 8 жыл бұрын

I rarely comment on videos. This is comment worthy. Great great vid man. As a newbie rider and proud and "foolish" ;) owner of a 73 350 twin that is waiting for me to get running again, I thank you. Where are you located the place I. The intro looks so much like Pasadena, CA which is where I'm from. Anyway thanks again.

@orical2832 4 жыл бұрын

Excellent info.

@Dangineering 7 жыл бұрын

Hey, just received a package from you! Thanks for the great service!

@kylemorski1499 8 жыл бұрын

Can you do a video of a CB350 carburetor rebuild?

@alexnavarro2819 8 жыл бұрын

Any advice you can provide on my CL450...seems to start and idle fine, lower speeds and gears fine but it doesn't want to go over 55. it starts sputtering like it's out of fuel .

@bobetzweiler2890 2 жыл бұрын

What another great video! This process always seemed super challenging to me. I appreciate how spelled out and made it doable. Thanks!

@chargerman100 5 жыл бұрын

Instead of putting a wire under the butterfly would it be okay to leave the butterflies totally closed and then come down with the idle adjustment screw until it just stops and use that guideline? I would think so

@hurrdurr25 7 жыл бұрын

Great method

@bdento59 10 ай бұрын

I don't own a guitar but I do have a carb jet wire gauge set. If you could mic the guitar wire for me it would be helpful so I know which gauge wire to use from my set for a good idle speed starting point. TYVM

@Trple777 4 жыл бұрын

Great technique but usually not all things are exactly equal, and sometimes you'll find that it is better to fine adjust idle while motorcycle is running. Provided both cables pull and retract roughly the same.

@murraykriner9425 2 жыл бұрын

When your working with clients, just how often do you find the bike's troubles are linked to this seeming insignificant maladjustment? With these tandem cables, it must be a pretty common ill with variation of cable deflection as the throttle wears and stretches over time.

@SinnerSince1962 2 жыл бұрын

Sweet vid! Thank you!

@jakefin6891 6 жыл бұрын

Please dont hate me. I was wondering what size of jet you would use if you were to have pod filters. Thanks in advance.

@bobschroeder8161 8 жыл бұрын

thanks this is similar to my cb400a carb and will help a great deal.plus maybe you have some parts I need.Like the acc/pump and both air c/offs.I will check your sight soon for these and plugs for both carbs as mine seem unreliable.Bob in sunny Wildwood florida w/ my 1980 hondamatic.w/ 29,000 actual.The new fuel (eth) is corrupting my ride time.any Hints are welcome here.Thanks again.bye and I need to get back into the wind.

@katana2665 8 жыл бұрын

Thank you.

@jimmyjamsweetlove2338 2 жыл бұрын

Great video, as are all the rest I love riding my cb360 without you guys as a company(for parts and information) I may not be as mobile. 🤣

@johnmartin9318 Жыл бұрын

Who are you

@ronwhite9117 2 жыл бұрын

Again...THANKS A BUNCH ! 👍👍

@glennhuntiv2704 5 жыл бұрын

That was made easy two thumbs up 👍👍

@Common-motor 5 жыл бұрын

Its a pretty easy process! Glad we could show that.

@EIKLURAM 5 жыл бұрын

Is there any chance you could do a video on how the fit the spring on the fuel cap?

@crazylikeafox7341 Жыл бұрын

I have been chasing my tail trying to tune my carbs and I think I just stumbled upon my problem and I feel like an idiot. Can someone confirm my stupidity for me? Is the choke , with the lever "open", physically in a vertical position, in the farthest notch from the two that are close together, the riding position it should be in after warm up? I think I have been using it backwards thinking that "open" was for cold start warm ups. PLEASE HELP.

@patrickmurray8304 2 жыл бұрын

Is the cb250 the same ?

@tennist0 9 жыл бұрын

I wish the 360t was this simple. Is there an advantage to the complexity of the 360t carb sync process?

@MrTexMart 8 жыл бұрын

+ArchSmith - The 360 design allows the carbs to be more finely synchronized. Also the 360 design allows you to adjust the sync in real time as the engine is running based on the engines' unique fuel flow demands. The 360 is like the 350 2.0, it is a higher precision engine, but on the flip side there is a much smaller margin for error.

@robertporter5320 4 жыл бұрын

Do you have a video on how to tune both carbs on a 350/450 while the motor is running?

@Common-motor 4 жыл бұрын

No. The only adjustments you can do on the bike running is idle speed (1200-1500 RPM) and idle mixture. Start with the mix screw 1.5 turns out from seated. Turn clockwise in 1/4 increments till you find the spot where the RPM increases the most. Adjust down the idle speed. Repeat for the other side.

@brynbull6942 5 жыл бұрын

Hi I'm having trouble with mine I can set mine up with the idle screw but when I try to set the other butterfly up with the screw and nut it doesn't seem to move any ideas plz

@Common-motor 5 жыл бұрын

hey Bryn! If you're having trouble still with the bike I'd recommend reaching out to our support line at 510) 824-8575 on monday or tuesday from 12-6 pm. We can maybe get a better idea of what's going on! If its busy leave us a message and we'll call you back to talk with you about it.

@tomdooley8019 7 жыл бұрын

is this basically the same for my 72 SL 350

@jaykarras48 3 жыл бұрын

Yes

@CriticalThinker02 8 жыл бұрын

Great video! Question: Any sage advice on why my '72 CB350 is buzzing/vibrating so much, especially at higher speeds?

@Common-motor 8 жыл бұрын

+CriticalThinker02 It was Honda's way to address keeping the circulation going in your feet and butt when riding for long stretches of time. ;) They all do that and it is just the nature of the engine architecture. You have to either have a balance shaft or have more pistons to smooth out the harmonic vibration.

@CriticalThinker02 8 жыл бұрын

Common Motor Collective Ha ha, roger that. Glad it's not just me then. Appreciate you getting back with!

@CriticalThinker02 8 жыл бұрын

Common Motor Collective Had another question for you... Hopefully you'll receive this. I feel like my 350 is really loose in the front, almost like it could start oscillating at 55/60. I don't notice that on my CB160. It's just really loose, like its too easy to turn the wheel (feels like a bicycle). Is this also a thing with the 350's (like the buzzy/vibration is) or could it be the headset needs tightening or something repaired?

@Common-motor 8 жыл бұрын

+CriticalThinker02 Sounds like you need to rebuild your headset. Could be loose or missing some of the ball bearings. Got an upgrade kit to change it out to tapered roller bearings, which will help smooth the steering out. www.common-motor.com/honda-steering-bearings Also you tires could be out of balance and causing a vibration at higher speeds.

@CriticalThinker02 8 жыл бұрын

Common Motor Collective Appreciate the advice and feedback!

@CalmingMix 5 жыл бұрын

Great videos. I have a CL175 any interest in posting some about that bike?

@Common-motor 5 жыл бұрын

It's on our to do list.

@CalmingMix 5 жыл бұрын

@@Common-motor I look forward to seeing some.

@jensdoc091 3 жыл бұрын

If the chain appears fine, how will I know when to replace the chain vs. move the real wheel?

@hiscifi2986 2 жыл бұрын

The usual trick is to measure the length of 10 pitches, for a 1/2 inch chain it will be ten inches. The chain is considered to be worn when this becomes ten and 1/8 inches. For a 5/8 chain, the ten inches will occur every 8 pitches. The other method is to see how much you can pull the chain off the rear sprocket, not too sure of an actual figure, because the size of the sprocket affects the result, but you should not 'uncover' any teeth. The 1/8 inch in 10 is the usual standard, even on industrial machines, forklifts, conveyor belts etc.

@snuffelsuf 8 жыл бұрын

is the throttle butterfly beveled;does i go in one specific way...please...ive heard yes and no so....if someone really knows

@badboybikerdude 8 жыл бұрын

+snuffelsuf Yes, it is beveled and it does go in one way only, usually with some writing on the upper side of the butterfly facing towards the engine.

@iplayoldschoolrunescape 7 жыл бұрын

I doubt anyone will answer this lol but i have a 1973 honda cb 350 twin and it doesnt idle like at all i have to give it gas and keep it at like above 1rpm at 3:50 he talks about how that bolt sets the idle speed or watever is that my issue? if i tighten it down will it let my motorcycle idle or do i have other issues on my bike? im thinking about getting it tuned soon too but i just want to know if i can do anything about this idle issue thanks :D

@marklindstrom433 7 жыл бұрын

go to hondatwins.net It's a forum website and there are people there who can help you out

@chargerman100 5 жыл бұрын

The most common problem is a clogged Idle Jet and that's probably what you have going on. If you look where your float is there's that float stop bracket you'll see two little round circles one is the main jet the other is the idle Jet they need to be cleaned out. I use welding tip cleaner you could get an any Harbor Freight type place for like $7 little fine wires that you can use to clean through the Jets