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Put on a new carb on poulan pro 50 cc won't idle. Idle screw doesn't affect the speed do I need to increase or decrease low screw it runs good at high rpms

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Adjust both till it runs perfect or set the idle screw up some.

Posted on Apr 24, 2017

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Derbi senda xtreme sm 50 bike ticks over and won't stay ticking and won't tick when choke is on or if throttle is opened maybe to do with carb ?


Hi, Marley and the usual suspects are:
1. Idle speed improperly adjusted.
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5. Plugged low-speed jet.
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https://www.oemmotorparts.com/oem2.asp?M=derbi
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Won't idle, cranks and runs fine as long as trigger is depressed


Could be just a carb adjustment required, the L screw on the carb will richen up the mixture, if increaseing the the idle screw does not help, try extra 1/4 turn out on the L screw, make sure the air filter is clean before makeing any adjustments.

Feb 12, 2012 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

So i've been using a poulan pro 4218 all summer, ran like a champ for me everyday all day. then the crankshaft holding the clutch and sprocket snapped.. not a problem bought the part and replaced it....


Sounds like a carb issue, the L screw on the carb adjust the fuel mixture from idle to half throttle, i would richen the L screw by unscrewing 1/4 turn, this should improve the running, however there is a special tool to adjust the screws, part no. 530035560, the screws are fuel, not air screws, increase a shade more if it is still not idling or accelerating properly.

Oct 30, 2011 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

2 Answers

Poulan 446t Will start, won't continue to


The diaphragm in the carb is likely ruined from the gas gelling onto it. This will put pinholes in it and then it won't work properly. Pick up a carb kit and rebuild it (if parts available) and then you should be good to go. If you can't rebuild the carb, a replacement will run you 30 bucks or more.

Aug 21, 2011 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

I need to tune up my saw but I can't find my owner's manual. It won't idle. Need to know how to adjust the low speed. It runs well but my low speed idle won't adjust to make it keep running.


The theory is much the same on all chainsaw carbs, start and warm the machine up, increase the idle speed with the idle screw if it will not tick over, start to turn the L screw in, the revs will increase as the mixture leans off, it will reach a point where it is too lean and start to die, at that point turn the screw out 1/4 turn, check it revs up clean, if not turn screw out bit at a time until it does, now set the idle speed with the idle screw. Before attempting this make sure the fuel filter is clean, and also the air filter.

Apr 20, 2011 | Poulan Garden

1 Answer

Poulan stalls out


on the side of the carb you should find two screws, one for the low speed jet nd one for he high speed jet. Turning the low speed jet only about a 1/4 turn at a time, adjust it in or out until it idles smoothly. Go to arboristsite.com, chainsaw and do a search on tuning for more complete info.

Jun 09, 2010 | Poulan Pro PP3816AV 38 Cc 16" Anti - Vib...

1 Answer

Base adjust. on carb high and low needles on carb polen 42 18" thanks


The standard setting on needles is to screw them in all the way and then back them out 1 and a half turns.

You need to set the mixtures for the carburetor. You will find a Low and High adjustment screw. turn the low adjustment screw out. You will notice that the rpms should start increasing. keep turning it out until the rpms start to drop then turn it back in a quarter of a turn. You may need to readjust the idle speed so the chain doesn't turn during idle. Do the same for the high adjustment screw.

Oct 01, 2009 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

How to adjust Zama carb on poulan pro


You will find a Low and High adjustment screw. At idle turn the screw in or clockwise until the rps starts to decrease. Then start turning it out till you hit max idle rpms. Turn screw back in a quarter to half turn and it should be idling smoothly. Be careful here and get someone to hold saw if necessary but hold in throttle to full speed and do the same with high adjustment screw. turn it in till rpm starts to drop then back it out until you get to max rpm and it won't go any higher then turn it back in a half a turn.

Jun 16, 2009 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

2 Answers

Idle run mixture controls


You will find a Low and High adjustment screw. At idle turn the screw in or clockwise until the rps starts to decrease. Then start turning it out till you hit max idle rpms. Turn screw back in a quarter to half turn and it should be idling smoothly. Be careful here and get someone to hold saw if necessary but hold in throttle to full speed and do the same with high adjustment screw. turn it in till rpm starts to drop then back it out until you get to max rpm and it won't go any higher then turn it back in a half a turn.

Jun 08, 2009 | Poulan Pro 16-Inch 38 cc Anti-Vibration...

1 Answer

How do I adjustment the carb on an almost brand new weed trimmer?


The H is for high rpm (Main mixture) and the L is for Low rpm (Idle Mixture). First turn in both screws all the way in and then turn them both out 1 and a half turns. Pump the primer bulb if the equipment has one. Start the engine, once it is idling, turn the L (Idle Mixture) screw out (counterclockwise) from the preliminary setting until the engine speed decreases (rich). Note the position of the needle. Now turn the adjusting needle in (clockwise). The engine speed may increase, then it will decrease as the needle is turned in (lean). Note the position of the needle. Set the adjusting needle midway between the rich and lean settings as in the picture below. Don't touch the throttle during this procedure. Once you have found the best idle speed for the engine then you need to adjust the high rpm. This process is the same as with the idle rpm process but you need the to hold the throttle wide open while you are adjusting the H (Main Mixture) needle on the carburetor.

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May 03, 2009 | Poulan Garden

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