Motorcycle Carburetors // Explained

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@kylevara
@thirteenandcompany
Motorcycle carburetors can seem complicated. In this video I discuss how to verify that indeed the carbs are what's causing your bike not to start, and a basic overview of motorcycle carburetor jetting, motorcycle carburetor cleaning methods and other useful info when troubleshooting a motorcycle. I hope you enjoy!
Here's a great step by step video on how to clean a carburetor.
• How To rebuild Honda K...
Thanks,
Kyle

[@LIVMOTORS]

Is it best to go with a new set of Mikuni carbs for the 70’s era bikes or rebuild the old ones?

[@kylevara]

Depends on what type of riding you will be doing. I stayed away from them because from what I have been told is that they are great for race application. For racing you're pretty much never at idle and mid to wide open throttle is pretty much where you'd live the majority of the time on the track. Supposably these things scream up top. I have heard that they aren't the greatest for idle and low end. For around town and at stoplights you're constantly dropping back down to idle. To me there is nothing more annoying than constantly worrying about an erratic idle on the low end. I would love to hear if anyone els has had success with them for street application. Hope that helps! -Kyle

[@LIVMOTORS]

@@kylevara sounds good I wasn’t sure but it’s mostly just street riding. With the velocity stacks did you have to adjust the jetting at all? If so what did you find worked best for the main and pilot jets

[@kylevara]

Yes I did, I believe I went up 2 sizes on the pilot, 1 clip position up on the needle (Richer) and 2 sizes on the main. I have to go through some notes. Depending on how open your exhaust system is that may vary. A trick to get a little more power on the CB's specifically is to run a smaller sized main on carbs 1 and 4. The frame rails actually block some airflow. So for example (these are just numbers off the top of my head)... I would run a 122.5 on 1 and 4 (outside carbs) and a 125 on 2 and 3. I can get you exact jet size I just have to dig through some notes. Keep in mind your elevation matters too. I am at sea level. @@LIVMOTORS

[@LIVMOTORS]

@@kylevara thank you ! I’m in Edmonton so like 2200ft above

[@SchysCraftCo.]

Awesome job. Great videos. Keep up the great craftsmanship and hard work my friend. Fab On. Weld On. Keep making. God bless.

[@aaryanpanwar6405]

Need more videos like this

[@rolandoramirez5832]

Digging it and we also like the hat. Puro TEXAS

[@alanbayne1700]

Hey Kyle, what solvent do you use in your ultrasonic cleaner after vapor-honing your carbs? I've used plain water, but I've found the aluminum darkens a bit.

[@kylevara]

Alan, I send all this work out to a shop here in Socal. The biggest thing is making sure that any of the solvents or cleaners you are going to use do not have any sort of acid in them. A lot of them do and I experienced a color change in the carbs with those. Water and Mild soap I haven't had that issue. When they come back from the vapor blaster my main priority is to make sure none of the media is hiding in the passages or threads. I then use compressed air to blow out everything. I'll do this a couple times for each part until no media can be found hiding. Hope this help! Thanks, Kyle