Pro 42CC 2 Cycle Chainsaw, 18″

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If the adjuster screws have a spline rather than a screw driver slot, then the special tool is part no. 530035560, be carful adjusting the H screw, this will govern the max revs, if you exceed 12000 rpm you could cause damage to the engine, you realy need a means of testing the max revs, a tachometer.

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If your chainsaw still starts and then stops working, check the air filter. Clean or replace the air filter if it is dirty or damaged. Another reason that your chainsaw starts and then stops working could be that the spark arrestor is dirty or clogged. If this is the case, clean it with a wire brush.
Over time, the spark arrestor can become clogged with soot. If the spark arrestor is clogged, the chainsaw may run stall or run rough. To unclog the spark arrestor, remove it and clean it with a wire brush. You can also replace the spark arrestor.
The carburetor might be clogged. A clogged carburetor is often caused by leaving fuel in the chainsaw for a long period of time. Over time, some of the ingredients in the fuel will evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting.
A dirty carburetor, bad gasoline and low-quality two-stroke oil that creates deposits all contribute to chainsaw starting problems.
There may be old or bad fuel in the carburetor float bowl. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and make the engine hard to start. If the carburetor is clogged, try cleaning it with carburetor cleaner.
The carburetor might be clogged. A clogged carburetor is often caused by leaving fuel in the chainsaw for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the chainsaw engine to stall.
The two most common reasons a chainsaw won`t idle are a blocked air filter and an idle screw out of adjustment. Other possible causes include: Dirty Air Filter. Idle Screw out of Adjustment.
The two most common reasons a chainsaw won`t idle are a blocked air filter and an idle screw out of adjustment. Other possible causes include: Dirty Air Filter. Idle Screw out of Adjustment.

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How do I adjust the carb it starts but shuts off hard to get started, is there a tool for adjustment
ANSWER : If the adjuster screws have a spline rather than a screw driver slot, then the special tool is part no. 530035560, be carful adjusting the H screw, this will govern the max revs, if you exceed 12000 rpm you could cause damage to the engine, you realy need a means of testing the max revs, a tachometer.

Carb screws need adjusted i need to know the settings
ANSWER : Hi. Lightly seat the low screw and bring it out one and a quarter turns. Lightly seat the high and bring it out one turn. Adjust idle screw to suit. Regards Phil.

Carburetor tool i need to adjust my carb on my husky 455 chainsaw but it has a special adjusting screw. where can i get the adjustment tool.
ANSWER : The splined Poulan Carb Adjustment Tool, 530035560, which was readily available for less than $20.00 before 2013, has become scarce and bottom the feeders are price gouging. Check ecrater.com and curtschainsawparts.com. I just received one and it is the quality item at very reasonable price, $14.00

The saw carb adjustment has a high and a low but they only turn haft turn how do i set them
ANSWER : If in the USA I would tell you to thank the EPA. I suspect you are in the UK, I do not know who to throw rocks at there. Some newer carburetors no longer have springs to maintain the needle settings, without the caps adjustment becomes a constant nightmare. There are tools available through eBay (search for Walbro tool).

Husky starting point “H” and “L” 1 turn CCW from lightly seated. If running and you just want to tweak it a little just follow this. it is the most helpful adjustment procedure I have found.
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.
There are 2 wav (sound – idle & full – may not be highlighted) files that I find most helpful, I think you will too. HTH
Lou
Constant tweaking may be camouflaging an air leak. Pressure tests are the only sure way to diagnose those. Air leaks undetected may destroy your saw.

I have a husqvarna 323L string trimmer. I stored it after running the tank & carb dry for about two years. I fueled it, then started it, & it ran for a minute then died like I turned the switch off. Since it would not restart, I found the fuel filter had broken off the hardened fuel line & it sucked gummy crap out of the tank & into the carb. Failing at cleaning the carb, I finally put a new carb on it & replaced the pump, hoses & filter. It has ran good till this year. I winterized it with stabilizer & left it with a full tank over the winter. The gas in the tank was gone when I got ready to use it this year. I filled the tank with premix, checked for leaks, then started it. It would run fine for about half a tank, start idling poorly (lean) then cutoff & refuse to restart till I refilled the tank. I finally found the tank had cracks & was letting pressure out of the tank & apparently this was causing the carb to lose it’s ability to siphon gas out of the tank. So I replaced the tank which came with new hoses & a filter, which I properly installed to the carb. It cranked right up, but when it runs a half tank, the carb quits sucking gas out of the tank. When I pump to prime the carb, it moves the fuel into the carb, but the pump never gets hard like it does when I prime the carb when the motor is cold. I have to keep refilling the tank, prime, & then it starts & runs until the tank gets about half empty. The new fuel filter is down in the gas tank properly, but It will not run after it shuts off until I refill the tank & prime. I’m baffled. New tank, new hoses, new filter, new carb, & I can find no leaks in the fuel system. It runs strong. The 323L is a two-stroke & it always cranks on the second pull from cold on a full tank. Any ideas?
ANSWER :

I have a 266 se husky saw and I can not get it to start, there is spark and fresh fuel in the saw, I have put a kit in the carb and the saw will fire but stop, it appears to flood with fuel after a short period of time while attempting to start it.The saw was running fine until the carb came loose on the barrel but I have been unsucessful at getting it to run since I have replaced the gasket between the carb and cylinder.
ANSWER : It probably damaged the diaphram when the carb came loose. you could try adjusting the carb. that will solve it every once in a while.

Trimmer takes a long time to warm up. Cuts out when under full trottle and will not idle. Which screws are high and low speed adjust? There are two of them side by side. Do U need a special tool to adjust hi/lo speed screws?
ANSWER : Sounds like the carb needs cleaning, it is staying on choke to long. I would not bother the screws, or either a hose for the gas flow is bad.

Need to know what carb screw adjustment need to be set at weedeater starts for about 4-7 sec then shuts down put new hoses on checked gas filter and cap checked out ok. i pump the ball about 10 times ,pull cord &starts for about 4-7 sec then shuts down,like no gas or electrical problem. i played with the screw settings & dont know where they shoould be set at . had carb all apart ,put in new plug doesnt seem to matter what i do it does the same thing . any thoughts?also when it starts the motor will rev up when u hit the gas and when it shuts down the gas hose from the tank is still full of gas
ANSWER : If there is a choke adjustment you should set that at full until the trimmer warms up, don’t touch the gas. Then repull start at half choke, don’t touch the gas either at this time. Then start at no choke, and then set your idle on the carberator with the adjustment screw. Also don’t push the primer bulb so many time you will cause the spark plug to get flooded and drown out the spark, which is exactly what is happening.