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How to adjust carby

Me boys have a one of the cheap replica pw50s and i dont know where to start with the carby settings ie.fuel,air,idle.It starts easy but as soon as i open the air it dies and if it dosnt die then it dies when i give it sum accelleration plz help

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The air fuel ratio: start with screw all the way in, not tight, Then back out 1.5 turns. Set your idle then readjust the a/f ratio to get best, then readjust your idle. good luck

Posted on Jul 12, 2009

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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
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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HARD TO START WHEN RUNNING IT DIES UNEXPECTANTLY ?


Is the fuel fresh? What is the idle like? Does the chain spin when idling? Could be a clutch problem or broken clutch spring? Carby setting could need adjusting? Is the air filter clean? Have a look at the spark plug?

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My yamaha 50cc moped struggles for power on a cold start,what could the problem be


Hi, Rachel797 and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
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4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
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11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on blue links below. Good luck and have a wonderful day.
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How do i tune the carby on a peewee 50? the bike wont run properly


Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on blue links below. Good luck and have a wonderful day.
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https://books.google.com/books?id=ozV8-Aer4N8C&pg=PA84&dq=pw50+manual&hl=en&ei=TCS2TcbdJ4PW0QG0z9jmDw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CGUQ6AEwAA#v=onepage&q=pw50%20manual&f=false
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1 Answer

How do I set the Fuel/air mix on my 2003 525sx. I recently stripped and cleaned carby and tampered with mix scew and since then it has been very hard to start does not idle to good but runs great when you...


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Poulan pro 42cc,18",PPB4218 is very hard to start and runs for a short time and then will not start when hot. It worked well first year, badly this season.Changed spark plug and cleaned fuel filter and...


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check your tank breather is working,

has this saw been sitting a while ? if so might pay to rekit carb

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check ignition spark under load ie while under compression load- could be a weak spark

check timming key

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check barrell bolts are tight everything been = engine should run

cheers

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1 Answer

Hi how to tune homelite 330 chain saw carby, idle


Before adjusting anything, check the fuel filter, air filter, and muffler for plugging. Check the condition of the fuel lines for decay or other damage. Tighten all carburetor fasteners. Make sure you have fresh fuel mix in the tank. Does the primer bulb pull fresh fuel into itself when pumped? Turn both jet screws CW to stops (lightly), then back out CCW 1-1/2 turns each. This is a basic setting and should allow the engine to start and run. Start the engine and allow it to warm up, then pull the throttle full on. Adjust H needle CW until the engine starts to speed up, but still 4-stroking. Proper final adjustment is when the engine 4-strokes unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L needle CW for fairly good idle, but still allows the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but the engine will continue to run. Hope this helps!

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1 Answer

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