4:00 Correction! I mis-spoke here in regards to Humidity the chart is right but I said it in reverse. High humidity=less dense, Low humidity=more dense. This was brought to my attention by @Shadowdog500 Thanks man!

Very informative. Thank you. I just ordered the jet slide chart. Keep up the good work.

Very informative and to the point. Now don't fret - you look good and you speak well! Don't let it get to you. Thank you for all the info!

These videos are useful, thank you for making them!

BEST CARB SETTINGS VIDEO I HAVE EVER SEEN!!!! Everything so well explained!! My bike is spitter/coughing at high revs and I dont know why, lol Tomorrow this video will make wonders when I come to solve the issue :D

You’re very bright, I like your approach. Thank you sir.

New subscriber! Thanks for taking the time to share your knowledge!

didnt help me solve the issue but definetly added to my knowledge of theory and jetting concepts

Excellent video ! Thank you.

I just had a soft seize on a husquavarna chainsaw that went into a lean condition. It appears that the fuel line hose to the carb was slightly ill fitting and started to suck air and less fuel. Now the rebuild consists of piston, cylinder and ring inspection and take it from there. As most people who experiece the lean condition and then a seize will say...."It was running great until it stopped".

Great video. Well done. Thank you.

If this video helped you considering giving "THANKS" ❤ it goes to help making more videos like this.

very helpful, thank you

14.7:1 is stochiometric ratio, not optimal, but idealistic (calculated by chemical formulae), to actually burn 100% of oxygen you need ~13.2:1 and to burn 100% of fuel you need ~16.5:1 AFR.

My issue was unknown modifications made to the carbs. Foind out the carb slide springs were trimmed and slides drilled out. Bought a used carb that was unmolested. Went with factory jetting settings. 190m 35 P. 2nd notch from the bottom on the needle jet clip. Slow roll pulls like a champ wot through the gears. But highway speed 70mph and twist to wide open throttle, i hit like a wall, and slightly roll back off the throttle, it comes back alive. Full bowl height is at factory spec. Carbs are synced. New air filter fuel filter. , coil, coil packs, plugs. New fuel pump and relay. Im wondering gas cap vent or peacock valve

Good video thanks

I recently tried a 24mm carb on a 81cc engine, the carb is set up for a 120cc engine, I'm guessing it needs much larger jets because it wouldn't run above half throttle and sputtered from about 1/4 on throttle, the 81 cc is modified, free-flowing exhaust, high revving cam , and ported head, with in shrouded valves, with a redline around 9500-11000 rpm, I'm about to go to a bigger bore, 90cc with a better head, larger valves, and about 0.5:1 more compression, I'm hoping for a minimum of around 12 hp at the wheel, I just wonder if this carb is going to work, it's a CV carb, the largest factory type carb available is a 20mm, I have a modified aftermarket intake port matched to the head, I have tiny drill bits to drill the 105 jet to about 120-125 +/-, in about 2 size steps, I have it at about 108-110 now and going to try it, I'm thinking about drilling the slow jet slightly to hopefully get a better idle, and just off idle, and I have washers to space the needle if needed, I have been wondering if modify the spring would help throttle response any? Maybe shorten the spring to lower the tension, so the throttle can open faster and easier, I had lost the stock springs and had to use a random spring, I only had half throttle, unless I had speed and let off, and went to full throttle really fast, then it went close to full throttle, luckily I found the stock spring! I was thinking if it's just long enough to close the throttle, maybe it will give throttle response like or close to the same as a slide carb, CV carbs suck with a variator I guess I may as well keep it, if I had a real transmission, I think I'd convert to a slide, any suggestions? Should I go with a 20mm carb and be happy with what it offers??

Thank you!

Thanks for sharing your knowledge junkman. I'm trying to figure out why my ,82 Goldwing isn't running well after removing the engine for a starter clutch repair this past spring. I might have a vacuum leak among other issues since I can see the spark plugs are white on at least three of the cylinders.

Funny, I just learned about what a motorcycle rectifier is. And he used the base word in the video. 00:22 Rectify means to make things right/ to fix mistakes. A motorcycle rectifier takes the 'bad' A/C and turns it to D/C of the correct voltage. Basically.

How to tune 2 stroke mikuni carburettor. I have indian Yamaha RX 135.

Thank you.

When my vstar is cold and hasn't run in a few hours it cannot and will not start without starter fluid. After I fire it up I have to stand there opening and closing the throttle until its hot. After that it starts as if there was never a problem to begin with. This occurs regardless of whether or not the choke is on

I just bought a new dr650 and it feels very sluggish. I know it’s not a sports bike and it cuts out when I first start even when the bike is warm. Stalls out sometimes from a stop (I know how to work a clutch) and 5th gear is pretty much useless. Do you guys think the carb needs to be tuned? Is this normal for a brand new bike?

Thanks 😊 🙏 that was helpful 😀 Plugs are still sooty could it be the mixture I'm doing wrong From the bonnie Highlands of Scotland America 🇺🇸 💙 god bless

Jetting and reading the spark plugs goes together right!?

A question my bike runs good low and mid power but at full power it feels very weak and have to short shift! Could this be lean on the main jet? Just installed a full exhaust ony 2 stroke gilera mxr 125 , ran fine before the exhaust change! Extremely appreciated a reply

i just got a brand new apollo rfz 125 open and went out to the trails today and after the exhaust pipe was all purple/blue for the first 5 inches of the pipe. so hopefully i didnt cause any damage? the bike performed really well tho.

You Rock!

I love that shirt.

Need a chart where can a get one. Playing mad scientist

It is cute how he keeps pulling his shirt down.

Hello, and thank you for the videos. I have a question, Why at lean mixture for two stroke the engine tends to increase a little bit the speed of engine: Thank you in advance.

High altitude air is more dense and low humidity right? so what should we do when the carb getting miss fire? do we need to rich or lean the air screw? thanks

Hi I have rev hang for a couple of seconds...could that be due to a vacuum leak or lean mixture?

Recently I installed a new carburetor in my car. The bigger main jet that it came with was of size 180. With 180 jet, the acceleration was jerky from half to full throttle, but it accelerated pretty quickly. I swapped the larger main jet from 180 to 135. Now with 135, the car bogs down under wide open throttle (especially when the pedal is quickly depressed), and then picks up after around 2 seconds. I've also noticed that the acceleration isn't as good with jet 135 as it was with 180. It idles perfectly fine and acceleration is smooth and crisp for half pedal; only problem is that with WOT, it bogs down and isn't accelerating as it should. Should I go for larger jet size of 150?

Where can I find a pocket tuner? :/ can't seem to find any, dunno if in looking for it correctly

I got the mikuni jet card... unfortunately it doesn't go lower than 100 and the jets I will use will be between 70 and 100. Any suggestions for a good app? Thanks for the awesome informative videos!

Any idea why my spark plug would be black (rich) when I had a vacuum leak at the intake? Idle jet passage is clean and clear.

I did not learn one thing about adjusting the fuel screw on my 4 cycle.

Sorry can someone explain why a leaner mix causes overheating? All I can think I'm my head is that the fuel somehow cools the air slightly?

I want my scooter fly so should I be setting up my carburetor for high altitude I don't understand I'm not cool like you no I'm just giving you a hard time video helped me a lot thank you

I have a question , what is the main jet ring or spigot purpose and its function ??

hello, my son has an 2004 cbr125r from Honda, he has n aftermarket exhaust an pops on dethtrottle/deacceleration. Guess its running lean. have u suggestion what to go up to from the 118 stock main? Do he need yo go up on pilot to?

humidity has more fuel? i thought the h20 takes up space making it leaner...? i'm gonna have to look into this one because i think you got it wrong on this one

I would like to submit a short video to you of my Yamaha AT3 restore! I’m hearing a noise that I’m concerned about. Thanks in advance!

Didnt mention rich or lean how to determine which one affects your machine

How in the world did old bikes ever get such a reliability / bullet proof reputation when it seems like nowadays jinking with carb. bikes are a constant hassle. I don't see how the dealerships would have ever made money unless it was from the constant servicing and adjusting of carbs. Maybe it was normal procedure back then and fuel injection has just spoiled us.

Well we know what rich and poor is, now this!

Junkman review the Lectron carb!

OOOOOOOOO MYYYYYYYYY GAAAAAAAAWD 👉💥😳

Steicometric point.

what a soft seized engine I know hard seized engine because I couldn't barely kick it over

Credentials?