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Inside A Motorcycle Carburetor - Idle Circuit | MC Garage

Jan 02, 2022
Is your

motorcycle

idling funky or maybe not even at all? If so, there can be several causes for this, but the most common and the first thing to fix or adjust is your carburettor at the Dani MC workshop, we are going to talk about the

idle

circuit

. From a modern fuel injected carb a steady

idle

no matter the conditions is a given but you have a carb on your ride things can be less consistent environmental factors like altitude and temperature may require you to make some changes in your car and of course the darn thing could be caked with dirt from sitting too long or not being fixed for a long time.
inside a motorcycle carburetor   idle circuit mc garage
The area made an awesome video a few years back on how to clean a carb and we'll go ahead and include the link. then click on that if you need to know how to clean your pilot jet if you haven't seen the first two videos in this

carburetor

video series go back and look at those first links of course they are in the pilot jet description along with wi The mixture screw is responsible for the idle on your bike, it also provides the fuel for the first 15 to 20 percent of the throttle pilot jet it is the smaller of the two jets under the main body of the

carburetor

that it flows into the fuel for mixing and atomizing. with the incoming air on its way to the cylinder in your service manual the manufacturer will list the standard size pilot for your bike and give you some alternatives for the ranges of altitudes and temperatures you might be writing in, however you just can't Change the rider and get ready to go, it may be close but there are still a few paces to go and tune up this is where you will need to listen to your bike first, your bike needs to warm up when the bike is cold.
inside a motorcycle carburetor   idle circuit mc garage

More Interesting Facts About,

inside a motorcycle carburetor idle circuit mc garage...

You will need to use the choke or enrichment

circuit

. A cold engine needs a richer ratio, which means a lower air-fuel ratio to run most flat slides like this. Use the separate enrichment circuits to supply additional fuel. It's basically a plunger that opens and closes. circuit other carbs may use a secondary throttle to limit airflow while pilot buys is the same medium thus creating that richer mixture once the engine is up to temperature turn off the choke we also need to make sure Make sure your air or fuel mixture screw is in the middle of the range to start this process if the mixer screw is on the side of the airbox an air screw like this here in meters air enters the pilot circuit by turning it in clockwise closes the opening reaching the mix counter clockwise adds air and leans the mix check your service manual but a proper reference setting should be around two turns and clockwise from fully closed or seated if mixture screw is on engine side in meters fuel instead of air clockwise is m less fuel and a leaner mixture while counterclockwise is more fuel for a richer mixture, just like the air screw, check your manual for the standard position or starting point, but a good rule of thumb for these s should be around a result and a half so once you have them in the correct starting position we can start tuning and pitching so let's see what the idle behavior will be like when a bike warms up it launches correctly. is it too rich or is it too lean, a proper idle should be consistent without any throttle input, you should also set it quickly after revving the engine, if it is too lean you will encounter a hesitation or stall at idle when you accelerate and also when you rev ​​the engine RPM will stay at a higher level than normal and also will not idle quickly a rich setting will give you a splutter when the throttle is broken response will feel a little heavy or sluggish when engine is revving RPM will drop rapidly and dip below ideal idle before recovering sometimes you will even die depending on that behavior you should have a pretty good idea if you need more or less fuel you are too rich or too lean from there start with scr ews mixer lean are rich in the pilot circuit a quarter turn at a time rev the engine listen feel and repeat you get an idle nice stable you're ready to go you can't get that nice idle without going to the extremes of the mix the screw settings say one turn either way from the starting point we'll have to change the jet sizes but when you change that spout, be sure to return the mixer screws to their standard position before starting the process again; otherwise you will have problems.
inside a motorcycle carburetor   idle circuit mc garage
Chasing trouble all over the place, they should give you a great base to start on your idle circuit or racer. Some modern four-stroke carbs have an accelerator pump and jet which is an added wrinkle we'll have to address in a later video but just make sure the circuit is clean and ready to go before trying to idle and rev later. We're also going to jump into the art of sinking a bank of carbs in a multi-cylinder engine. we'll get most of you with a single carburetor well on your way to tuning your

motorcycle

's idle circuit in the next video we're going to move on to needle jetting and needle that's it for this episode AMC Garage if you have any questions or comment, write it below if I like what we are doing Like Subscribe and share and thanks for watching
inside a motorcycle carburetor   idle circuit mc garage

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