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Motor starts good idiols high and stays there

Tried to adjust and it still stays wide open can get it to idle down

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Rebuild carb with factory kit..,it sounds like its flooding. Or throttle is stuck wide open..,maybe a bad return spring is broke.

Posted on Dec 13, 2014

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Posted on Jan 02, 2017

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How do I adjust the carburator?


There are two needle screws that can be adjusted to make the engine run properly. Be certain that the carburetor is clean and the diaphragm is in good condition, and the fuel is new. The two needle screws mentioned above should initially be adjusted at one turn open from turned in all the way (lightly seated). Each of these needle screws performs different functions. One is for idle and throttle response (this screw is marked "L" and the other screw is marked "H". L and H are marked on the carburetor body and also on the plastic "shroud" near the adjustment screws. These screws are not interchangeable, being foolproof since the thread sizes are not the same. When properly adjusted the low speed screw (L) allows the engine to idle properly and throttle response will work properly. When the high speed screw is adjusted properly the engine will have correct power at full speed. Adjust the low speed screw so that the engine idles and when you squeeze throttle all the way to wide open the engine should not hesitate and should come up to full speed and when you drop the throttle it should idle nicely without stalling. Now adjust the high speed screw. Hold throttle wide open, holding it there while you adjust the high speed screw. If this scares you (be carefully so that the spinning chain does not cut you!) you may adjust the high speed screw at idle, turning it just slightly in or out. The high speed screw should be adjusted so that the engine does not run clean at wide open throttle but sputters slightly, slightly adjusted open from running clean to slightly sputtering. When under load (cutting a log) the engine should run clean. Good luck!

May 21, 2012 | Husqvarna , No.455 Rancher, 20" Gas -...

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HOW TO ADJUST THE CARBURETOR ON A SMALL GASOLINE ENGINE


We all have some frustration with small gasoline engines from time to time. Often, do to our own weak maintenance schedule we put these engines away for the season without paying any attention to the recommended procedures in the owner manual. Today I am going to talk you through the steps to adjust a small gas engine's carburetor.
1. Read through the whole list before you start adjusting.
2. Close both jets GENTLY
3. Open the Low speed 1/4 turn
4. Open high speed jet 1 1/4 turn
5. Start engine.
6. Adjust low speed until idling smoothly.
7. Open her up wide open.
8. Adjust High speed until engine transitions smoothly from idle to high speed without bogging.
9. Shut engine off. Let it cool.
10. Once engine is cold. Fire it up and let it idle for 30 seconds. Open it up wide open again. Adjust if necessary.

Please Note - It is best to adjust the carburetor at the beginning of the usage season. In other words, don't adjust your rototiller engine in the dead of winter when you won't use it in those conditions. Regards, Joe

on Dec 31, 2009 | Sport & Outdoor - Others

1 Answer

I would like to know what the factory high and low settings are on carb mantis 2 cycle there are no plastic caps on my jet screws and need to know how many turns out ...


After seating the screws back them out 1 1/2 turns. This should be close enough to get it started. Let the motor warm up a little then, with it idling, turn the low screw in until it starts having a hard time running then back it out until it idles smoothly. Prop up the Mantis so it can run at full speed safely while you adjust the high side. With the throttle wide open, again turn the high screw in until it starts running roughly and back it out until the motor is running smooth. Some say to turn the screws out until the motor starts having a hard time running and then turn it back in half way to where it was running bad at the other end. This doesn't work as some engines don't care how far open the screws are.

May 26, 2011 | Mantis 2-Cycle Tiller

1 Answer

Fuel mix and slow/fast running jet ajustment Dolmar sach 119. starts easy wont pull under load.


Set both the high and low speed screws from lightly seated to 1 1/4 turns out. This will give you a rough setting that will allow the saw to start and idle. Set the idle screw to where the chain just stops moving at idle.
With the saw warmed up adjust the low speed screw out until the saw smokes a bit and acceleration is sluggish. Bring the screw in small steps until the hesitation is gone from the acceleration...you may need to adjust the idle again after this.
Now hold the throttle wide open and while it is wide open adjust the high speed screw in until the noise becomes smooth and the saw "sings". Do not leave it at this setting as it will burn down in short order. Once the saw is singing back the screw out until you can hear the saw's tone "roughen"....then back the screw out a tad more for good power / fuel under load.
That's it in a nutshell...here's a good link also...

http://www.youtube.com/watch?v=3Lw0pJcEPYo&feature=player_embedded

Dec 08, 2010 | Garden

1 Answer

WILL YOU PLEASE TELL ME HOW TO ADJUST THE CARB AIR-GAS THE THREE YOU TURN WITH A SCREWDRIVER


Set both the high and low speed screws from lightly seated to 1 1/4 turns out. This will give you a rough setting that will allow the saw to start and idle. Set the idle screw to where the chain just stops moving at idle.
With the saw warmed up adjust the low speed screw out until the saw smokes a bit and acceleration is sluggish. Bring the screw in small steps until the hesitation is gone from the acceleration...you may need to adjust the idle again after this.
Now hold the throttle wide open and while it is wide open adjust the high speed screw in until the noise becomes smooth and the saw "sings". Do not leave it at this setting as it will burn down in short order. Once the saw is singing back the screw out until you can hear the saw's tone "roughen"....then back the screw out a tad more for good power / fuel under load.
That's it in a nutshell...here's a good link also...


Dec 07, 2010 | McCulloch Garden

1 Answer

The owners manual for my Ryobi 210 describes carburetor adjustment but the photos do not show which screw is the idle mixture adjuster.


The Low speed adjustment screw is the one marked as "L" and would be adjusted during:
1. Idle - to insure running smoothly, and
2. Acceleration - to transition from Idle to High Speed.

The High speed adjustment screw is the one marked as "H" and would be adjusted during:
1. High speed or Wide Open Throttle. Turn about 1/8 either way to gain top RPM's and then back off slightly.

The final screw is an Idle Set screw. This screw sets the actual speed of the Idle and is the screw attached to the end of the throttle cable as it terminates at the carburetor. Turning it:
1. Clockwise - increases RPM's (speeds up motor)
2. Counter Clockwise - reduces RPM's (slows down the motor)

Sep 28, 2010 | Ryobi Garden

1 Answer

Need intructions on carberator adjustments for mac-3514 35cc/cm3 runs but hard to start after using it for few minutes.


There is a low speed jet and high speed. Low speed sets the idle or stays running without feathering the throttle./// When setting high speed, hold the throttle wide open until engine revs high, then turn back in(at least ¼ turn) to slow the engine which in turn gives the engine more gas and runs cooler. If you have it too lean on the high speed, it will be hot and hard to start. Sometimes using 40 to 1 mix helps with starting, especially on older chainsaw. good luck

Sep 22, 2010 | McCulloch Garden

1 Answer

CLEAND CARB NEED TO KNOW HOW TO ADJUST CARB


Most carbs have the adjustment removed (EPA) but if yours still has the adjusting screws here are the seat of the pants methods:

One Screw Carb: Turn it all the way in and then back out 3-1/2 turns, start the engine and make slight turns in or out until the motor runs smooth from idle to wide open, do not get it too lean, turn in until max RPM is reached then turn out 1/8 turn and go from there.

Two Screw Carb: You adjust the one to remedy either the low or high, high is adjusted until the motor runs smoothly under load at high RPM and the low is adjusted until idle and off idle is smooth.

Feb 27, 2010 | Troy Bilt Tb70ss Gas Trimmer

2 Answers

I have a older model # 30 jiffy ice auger and i can not seem to keep it running consistanly. I was wandering what the carburator adjustments are. The low idle screw and the high idle screw where do I start...


Hello Randy. I can talk you through making adjustments to your Jiffy ice auger engine.
1. Read through the whole list before you start adjusting.
2. Close both jets GENTLY
3. Open the Low speed 1/4 turn
4. Open high speed jet 1 1/4 turn
5. Start engine.
6. Adjust low speed until idling smoothly.
7. Open her up wide open.
8. Adjust High speed until engine transitions smoothly from idle to high speed without bogging.
9. Shut engine off. Let it cool.
10. Once engine is cold. Fire it up and let it idle for 30 secs. Open it up wide open again. Adjust if necassary.

NOTE 1: The trick with the Jiffy's is to tune them during cold (ice fishing) weather.
NOTE 2: Low speed screw,the one on the left.
NOTE 3: High speed on the right.

Good luck ice fishing! Regards, Joe

Dec 31, 2009 | Sport & Outdoor - Others

3 Answers

I have a 1981 Honda CT110 Trail 2 wheel motorcycle. I have been working on it and everything seems to be working normal except the idle. It will idle normal for a time and the suddenly rev real high. I...


The problem is an air leak leaning the fuel mix. The idle speed starts going up a ramp until it is wide open. The valves no longer seating well is a possible cause as is carb manifold gaskets, rings and a cylinder head not torqued down tight.

Apr 23, 2009 | 1982 Honda VT 250 F

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