Too much Engine Choke | Does this to your Engine. Chainsaw or Lawnmower wont start!

* VISUALLY EXPLAINED

Using too much engine choke can indeed cause a flooding issue and prevent the engine from starting. To understand why, let's explore the mechanics behind this common problem.

The Purpose of the Choke: The choke is a device in small engines like chainsaws and lawnmowers that restricts the flow of air to the carburetor. It serves a crucial role during cold starts by increasing the fuel-to-air ratio. When the engine is cold, it needs more fuel and less air for proper combustion, and the choke helps achieve this by partially closing off the air supply.

Fuel Enrichment: When you engage the choke, it narrows the air passage, which increases the vacuum in the carburetor. As a result, the carburetor draws in more fuel compared to the limited amount of air, creating a richer mixture.

The Flooding Effect: If you keep the choke engaged for too long or push it too far, the engine gets an excessive amount of fuel in the carburetor. When this happens, the fuel-air mixture becomes overly rich and saturated. The carburetor bowl can overflow, causing fuel to flood into the engine.

The Consequences of Flooding: When the engine is flooded, there is too much fuel for ignition. An overly rich mixture doesn't burn efficiently, making it difficult for the spark plug to ignite it. As a result, the engine won't start, or it might start and stall immediately because it can't burn all the excess fuel.

Problems Beyond Non-Starting: Flooding can lead to other issues as well. The excess fuel can wash away the lubricating oil on the cylinder walls, increasing friction and possibly causing damage over time. It can also foul the spark plug, making it necessary to clean or replace it.

Proper Choke Usage: To avoid flooding, it's important to use the choke correctly. Engage the choke when starting a cold engine, and once the engine starts, gradually disengage it as the engine warms up. A good rule of thumb is to push it in or open it up slightly as the engine gains temperature. This allows for a smooth transition from the enriched cold-start mixture to a leaner, normal operating mixture.

In conclusion, the choke is a valuable tool for starting a cold engine, but using too much of it for too long can lead to flooding, causing starting problems and potential engine damage. Proper choke management is essential to ensure that your engine starts smoothly and runs efficiently.

Whether your chainsaw wont start, or you need to know how to tune a chainsaw, how to tune a quad bike, how to tune a mini pocket bike or how to tune a carburetor in general, knowing some basics of how these two carburetors work will give you an understanding of why you are doing the adjustment.

The more you learn about, carburetors and how they function, the easier you will find it to tackle carburetor diagnosis and repairs. This is a chance to sit back and increase your knowledge!

Many thanks indeed

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[arthurfricchione]

Craig your videos are so helpful. It’s nice to get a full understanding of what is actually happening and why. Thank you much for sharing your knowledge. 😊😊😊

[chidovimus]

Thank you so much man!!! This cleared up a lot for me :))) diagram and explanation was 100% 10/10 amazing

[lucasprosman]

Thank you so much! I've been working on a car together with a friend of mine for a while now. It's so nice to know what the hell he's been talking about :)

[fastmonaro]

There you go. I like simple explanations.

[TheMomond]

Thank you, you’ve aced the explanation! Simple, to the point and interesting.

[stefanm]

That was a great explanation Thank you.

[cranjismcbasketball]

Great simple explanation... you got a new subscriber here!!!👍👍👍

[muffin]

absolutely beautiful explaining. subscribed instantly and i plan on watching much more. thank you!

[treebutcher]

Another good explanation, great informative videos. Just in an attempt to add something for others to note, this same over fueling/ choked condition could also be caused by a blocked or very dirty air filter which would also make the engine run rich.

[ninocrudele]

Fantastic explanation thank you so much

[Wilsee]

Brilliant video as always! I've a strange issue where my choke doesn't actually do anything. The machine (Titan petrol strimmer) takes a lot of pulls to get going on any choke setting. When it runs and I apply the choke it does nothing, shouldn't it bog down the machine and eventually stop it? I have checked the choke assembly with another machine and it appears fine. I have changed the carb for a new one with a primer bulb setup as opposed to a purge bulb I can only think it has something to do with that?

[antoniofdez]

It also damages the engine because some of the the unburnt fuel gets past the piston rings and dilutes the engine oil.

[mohamedihsaanhuzain]

Can i ride in choke on in low rpm for like significant distance bcz it will help in tight twisty roads?

[peteskyrunner]

My 4hp Hangkai outboard engine will only run with the choke on. I've tried cleaning the carb and jets with carb cleaner but it's still the same. As soon as I switch the choke off it stalls. Anyone got any ideas please? And will it damage the engine if I keep running it with the choke on?

[craigbutler]

Awesome explanation. I’m living in Vietnam and I have an old Honda 67 motorbike. If I don’t ride it for a couple of days I need to use the choke to start it. But recently when I start the bike, it runs for about 2 seconds and then even if I twist the accelerator, the engine will just die. Any idea why it won’t run? I can start the engine using the choke (won’t start if the choke is off), but I can’t keep it running, it just stops. I had to get a taxi to the consulate this morning cos I couldn’t get it running :(

[muchwithamouthdogepool]

What is the time limit in using the choke?

[makingmarv]

I have a 2002 honda rebel 250. I was tuning the carb by adjusting the idle and fuel mixture screws. After, with the bike being warm from riding for about 20 mins, the bike would die if I opened the choke. Is this normal?

[SyncoprNZ]

Another good video.
Should be "affects" though. ;-)

[dj]

Thank you. Very informative. Question: I have an 8hp single cylinder Tecumseh HMSK80 engine on my snowblower. When cold and with the choke on 3 primes on the primer bulb the engine starts right up and runs well. After running the engine for a few minuets to get it nice and warm, I shut down the engine. With the choke still in the open position (choke off) it will not start unless I prime it once or don't prime it but put the choke back on then it will start and run fine. The carb is completely clean, checked the fuel cap, it's venting, check for spark while it was hot. I had spark. I cleaned the fuel tank and made sure all was dry. I used canned fuel 92 octane (NO ethanol), New spark plug. It's an old style Tecumseh carb adjustable. I set the carb to manual specs. The carb bowl jet adjusted out 1.5 turns and the air fuel mix one turn out. I also tried it at 1 1/4 turn out as well. So why does my warm engine need the choke on when warmed up? Thanks for taking a look.

[mbaceo]

do U need a CHOKE if engine starts with OPEN choke ? NO CHOKE