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Is the low speed mixture on a 1980 HD keihin carby air flow or fuel flow, so I know which way to turn the hidden screw to richen the fuel mixture

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Typically the rule of thumb is that if the screw location is engine side of the carb vertical center line it is a fuel screw. If it is airbox side it is an air screw. This does not apply to some Chinese product. Not your case as the keihin is a Japanese brand.

Posted on Dec 15, 2014

Testimonial: "Thanks,but I needed definite exact info for this actual carby and model. Got the answer now though. Thanks for your time"

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Posted on Jan 02, 2017

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Wanted to know where to set idle screw on pewe 80 carby


Hi, Danny you need to make sure you have no intake leaks by spraying some Brake Kleen, Contact Cleaner, Starting Fluid etc. around the intake manifold and seals, if the RPM's go up or down significantly then you have a leak that needs to be fixed before you can continue with the carburetor adjustment.
The engine should be at operating temperature with the enrichener off to set the idle between 950-1050 rpm. Turn the idle skrew clockwise to increase the idle speed and counterclockwise to decrease the idle speed. If you have access to your air fuel mixture skrew you may turn it as well, if not there is a video below on how to gain access, make sure you start with clean or new spark plugs. Gently turn the air fuel mixture skrew clockwise until it starts to bottom out "STOP" do not over tighten as it will damage the taper on the end, now back the skrew out 1-1/2 full turns to establish a starting point start the engine and check the idle rpm's and turn the idle skrew accordingly for 950-1050 rpm if necessary, turn the air fuel mixture skrew 1/4 turn at a time and let the engine settle for about 10 seconds, turn the skrew clockwise for a leaner mixture and counterclockwise for a richer mixture, you are seeking the highest rpm your air fuel mixture skrew can acquire without going past 3 full turns from bottom then resetting the idle skrew back down to 950-1050 rpm If you can not detect any rpm change and can not stall the engine by turning the air-fuel mixture skrew all the way in then your pilot/low-speed jet is too big and needs to be replaced with the next size smaller. Final adjustment should be made with a clean air filter mounted to the carburetor.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
http://www.miniriders.com/carby-and-tuning/39510-pw-50-carbie-adjustment.html
Life On 2 Wheels
YAMAHA PW80 Owner Service Manual
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YAMAHA PW80 Owner Manual

Jun 17, 2017 | 2004 Yamaha PW 80

1 Answer

Ajust idle on 2002 FXDL


Hi Anonymous, on the right hand side of the carburator there is an idle adjusting screw with a spring behind it, turn screw clockwise to increase idle counter clockwise to decrease idle. There is also an air/fuel mixture screw inside a carb body lug that may or may not be plugged with an aluminum cap that's about 3/16" thick. This cap can be drilled out to acess the air/fuel mixture screw. Turning screw clockwise will lean out mixture and lower idle, turning screw counter clockwise will richen mixture and raise idle. You need to balance the two adjusting screws to obtain an idle of 950-1000 RPM then back out air/fuel mixture screw 1/4 turn, snap throttle to confirm responce, you may continue to back out air/fuel mixture screw untill desired throttle responce is achieved, if you see black smoke coming out of exhaust you have gone to far and need to turn screw back in 1/8 turn at a time. Good luck.

Oct 04, 2013 | 2002 Harley Davidson FXDL Dyna Low Rider

1 Answer

How do you adjust ldle air mixture on 2002 dyna low rider


Hi Anonymous, on the right hand side of the carburator there is an idle adjusting screw with a spring behind it, turn screw clockwise to increase idle counter clockwise to decrease idle. There is also an air/fuel mixture screw inside a carb body lug that may or may not be plugged with an aluminum cap that's about 3/16" thick. This cap can be drilled out to acess the air/fuel mixture screw. Turning screw clockwise will lean out mixture and lower idle, turning screw counter clockwise will richen mixture and raise idle. You need to balance the two adjusting screws to obtain an idle of 950-1000 RPM then back out air/fuel mixture screw 1/4 turn, snap throttle to confirm responce, you may continue to back out air/fuel mixture screw untill desired throttle responce is achieved, if you see black smoke coming out of exhaust you have gone to far and need to turn screw back in 1/8 turn at a time. Good luck.

Apr 14, 2013 | 2002 Harley Davidson FXDL Dyna Low Rider

1 Answer

What does "h" or "l" stand for on a carburator adjustment screw ?


H is the high speed adjustment ( screw in to lean the mixture and increase the revs, screw out to richen and decrease revs ) I is the idle screw, this will adjust the tick over speed of the engine, you can also have a srew marked L this is to adjust the low speed running by leaning or richening the fuel mixture

Jul 21, 2012 | Garden

1 Answer

How do you adjust the air flow mixture on a 2005 electra glide


Hi Anonymous, on the right hand side of the carburator there is an idle adjusting screw with a spring behind it, turn screw clockwise to increase idle counter clockwise to decrease idle. There is also an air/fuel mixture screw inside a carb body lug that may or may not be plugged with an aluminum cap that's about 3/16" thick. This cap can be drilled out to acess the air/fuel mixture screw. Turning screw clockwise will lean out mixture and lower idle, turning screw counter clockwise will richen mixture and raise idle. You need to balance the two adjusting screws to obtain an idle of 950-1000 RPM then back out air/fuel mixture screw 1/4 turn, snap throttle to confirm responce, you may continue to back out air/fuel mixture screw untill desired throttle responce is achieved, if you see black smoke coming out of exhaust you have gone to far and need to turn screw back in 1/8 turn at a time. Good luck.

Apr 01, 2012 | 2005 Harley Davidson XL 1200 C Sportster...

1 Answer

Hello I have a 1980 Ford Bronco 351 2bbl. Wondering if anyone knows which screws adjust what? Please if anyone has any ideas please respond. Thank you.


Here are some images that might help to assist you, and let me know if you require any further assistance.


Adjust the curb idle with the engine warmed up and the choke off.

421d8f7.jpg


The air/fuel mixture screws should be adjusted with the engine warmed up and at normal idle speed, then turn each air/fuel mixture screw in one at a time until the engine just begins to mis-fire, then back the air/fuel mixture screw out 1-1/2 to 2 turns out a half a turn at a time until the engine idle is the smoothest. (your vehicle might have restrictor caps over the air/fuel mixture screws to limit the amount of adjustment)

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The choke adjustments;

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To adjust the vacuum tension pull on the choke pull-off:

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Adjust the fast idle screw to the proper RPM with the engine cold and the choke on.

cadcd19.jpg

Jul 31, 2010 | 1981 Ford Bronco

2 Answers

Dies at full throttle.


Hi,
Has it been standing for a while?
Few things to check.
1: Fuel filter in tank. Use a piece of bent wire to hook the filter through the filler hole and pull it out and swap it.They get gummed up with oil if they have been standing.
2: Fuel hose. Even the tiniest pinhole in the fuel line will cause exactly the problem you have.
3: Many chainsaws have another hose that goes from the crankcase to the carby, this is the "pulse line" and is just as critical as the fuel line.
4: Although one tuning jet is marked "H" for high speed, & one is marked "L" for low, at full revs they both deliver fuel, see if you can richen ( turn anti-clockwise ) the "L" jet a bit more and try that.

Please let me know and give me some more info, I have all confidence we can nail it.

Oct 15, 2009 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

Pops and shuts down after riding for awhile, only when you stop


Yours must be one of the last years with a carby? Sounds like a low speed jetting problem. Bike may be running lean on the low speed jetting. Suggest starting by adjusting air mixture screw ( pilot air screw) out to 3-3.5 turns, very gently and by 1/4 turns to richen the idle mixture. Once the needle jet comes into play, she clearly runs nicely, so it's most likely that air screw as MoCo set it lean. Good Luck

May 04, 2009 | 2006 Harley Davidson XL 883 Sportster

1 Answer

Repair manual for mcculloch B320 blower


The hose with the filter in the tank is the pick up, the other is return. the pick up is usualy goes towards the middle pipe on the carby. if you get them around the wrong way it wont pick of fuel..

Screw the mixtures in untill they just bottom and screw them out 1 to 1.5 turns start up set low mix untill its just "four stroking" the set the high.

Jan 18, 2009 | Garden

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