Throttle

ground breaking aye .. has been taken from RC aircraft engine carbs designed since the 70&80s.. 50 years late

Very cool👍🏻

Eww, that's a super cheap construction 🤮

oooh, throttle barrel. I'm so used to seeing a butterfly valve!

My old Jonsered weed eater is having starting problems and has a long worm up phase before it runs reliable under full throttle -> now I can’t wait to get my hands on the carb. Thanks for your thorough explanations.

The best teacher!!

I bought a new carb for es255es echo blower it starts blue smokes and stops but the high speed jet in the old carb as a small hole in tit the jet the new one as no hole I have 125compression will it run at that I have done. Cars since I was 17yr old now 75 I am a bit baffled they r u no spent hrs on this thing I am a stihl man really but don’t like been beat thanku

Hey Craig 👋 Thanks

Simple and cheap.

Just subscribed to this channel. Recently watched some videos...top notch. My take has always been that an engine is first and foremost a vacuum air pump which drives the fuel delivery system

the fuel flows through the high first so if the low is set properly and no debris in the fuel tuning the high will properly set the low

Having seen similar videos, this one was most helpful for unterstanding. The cut open engine and detailled explanation of the interaction between all necessary parts really stood out. It allowed me to understand the schematics of the various simulated models! Hopefully i will be able to maintain our equipment better now. MANY THANKS!

Because they don't want us to find it. Thanks.

¡Gracias por compartir!

hello craig,i really appreciate the comment you upload and love how much you go in detail with your explanations,nobody else in this platform shares that much info about small sized engines as you do. i noticed that in your older videos you used to have a website where you said there where leaflets with step by step guides on how to fix a variety of problems,unfortunately the website is now gone so i was wondering if you could somehow share those leaflets with us again,i don't believe am the only one who is intrested in this,thank you in advance and keep up the good work😁

Damn air fuel mixture screw doesn't seem to change anything! My mini bike either idles high and has good response, or it's idol is low and it cuts off a lot

I’m Danish, and the word for idle in Swedish is similar to the danish “Tomgang” with a T! I might be bias for loving my husky, but one might think it could have originated from good ol’ Scandinavia

If you’re curious he also has an excellent video on the adjustments screws.

I’ve got a question, I have a 2 stroke blower. All works well . But when you put it on the ground and go to pick it up it stalls/dies . Cranks seals checked no leaks , 150psi compression . Changed carb still happens , new fuel filter , spark plug ,air filter . Any ideas ?

So, if the engine idles very high with the idle screw turned all the way out the carb is running to lean and the screw needs to be turned in ?

Thanks so much

A very well made and informative video that taught me a few things and helped me to have a better understanding of carby issues and functionality.

The video was very explanatory, but I don't know if I missed it, but I don't remember seeing how to return the low and high speed screws to their default settings. How many turns do I need to make it work?

Great video to share with people I repair there machines. Thanks

Thanks for the clarity Craig , pictures are worth alot 😄

On my chainsaw, I can pull the choke to get the high idle and get it to cold start. Then I feather the choke valve as the engine warms up. After a minute or more, I can use the throttle and the choke will come off the high idle. once it's fully warmed up, the chainsaw will usually idle when I set it down to get another piece of firewood ready to cut. Sometimes the saw will stall out and it doesn't want to start unless I set it at high idle with partial choke to avoid flooding the engine. I found the low and high mixture screws function similarly to the primary and secondary fuel system on a 4 barrel carburetor. The smaller 2 strokes are really simple to fine tune once you get the hang of it. For a while, I was running the mixture a bit on the richer side and it wasn't getting very much power during the cuts. One of the times I ran the saw out of fuel, it suddenly revved up to full power just as it ran out of fuel. Then I readjusted the fuel mixture slightly leaner while I had the chainsaw jammed into a log and I made the final adjustments to make it scream. I found that bench tuning it would cause the chainsaw to lose power while cutting through a thicker log. 42cc 18inch bar Poulan Blackhawk that I bought as a lemon on Marketplace over a year ago. I had modified the muffler and upgraded to better quality fuel lines. The seller said that it needed a carburetor kit. I never touched the carburetor other than making the necessary adjustments to the fuel mixture and the idle screws. The saw is a bit louder with the little bit of modification to the muffler. I haven't made any porting modifications yet. The saw was previously used in doing demolition and renovation jobs by the previous owner who had purchased the chainsaw when it was new. He would cold start the saw and run it wide open throttle on a cold engine indoors and it caused some scoring to the cylinder wall and it may have lost a bit of compression. I didn't bother to do a compression test. At some point in time before I bought the chainsaw from marketplace, he had taken the carburetor off and tried to clean it or something. But the dummy with his sausage fingers put the fuel lines back on in reverse order and also caused a binding problem between the choke lever and the throttle cable. Luckily I was able to figure it out and got it back together correctly. Real mechanics are becoming more and more rare in existence where I live. The majority of repair shops and parts counters always recommend to discard the non running saws and purchase a new one. I don't have that kind of money to keep good equipment going into landfills and scrap yards. I'm one of a fortunate few who likes running old junk. The poulans are one of those throwaway brands that even most sellers are scared to talk to me when I'm looking to buy another non running chainsaw. I've never complained about the poor condition. It's just these guys probably feel bad for selling their junk at such a high price. As long as I can get my money's worth out of it. I got nothing to complain about

you make the best videos craig!

Craig how may turns out is a good staring point for setting these adjustment screws ? 1 1/2 turns out for each as a beginning point ?

Everywhere around us but complex, love the content

Great video. Simple and understandable.

Yeni yılda mutlu olsun

Happy New Year Craig

Brilliant as usual. I love the deep analysis. Thanks

Amazing tutorial. Sir, you have saved me a trip to the looney bin. I am thankful for your expertise.

All knots should be made illegal, but this is a fantastic tip!

Some clone carbs by China manufacturer doesn't have the H screw. The place where the H screw usually sits now plugged permanently. Although that type of carb doesn't require fiddling those H screw, the engine has a lack of top end power. Somehow, these types are for people who don't know much about the fuel to air ratio. If the carburetor has some issues, don't bother to service them. Just discard them and get a new one because they're filthy cheap.

Cool procedure, Mr. Craig! Thank you. Happy New Year!

Hold any two of the loops of the chain in between your thumbs and pointer fingers arms extended in front of you and flip the one side over the other you should be left holding an untangled section remember to wear gloves . ..

Usefull helps.. thanks much...

Very informative,keep up the good work!!

Had to do that many a time.. lol

Thank You

You’r brilliant thank you so much!!!!

Thanks. This was a very annoying problem for me.❤❤

Awesome, tx

A lot of the carb rebuild kits contain duplicate diaphragms of a different material. When and how do you use these? Can you do a video on that subject please?

Excelente aula

I did just that, i removed the small rubber plug to expose the hidden Low screw, it's there but doesn't have a slot to be adjusted l....🤷🏻

Thank you so so much for explaining the governer arm to me i was wondering how it worked.