I have a husqvarna 350 that I have put 2 new carbs on. The saw starts easy runs about 1 or 2 minutes then it dies. I have checked fire (it is ok), checked fuel lines (there ok) and replaced primer bulb. Tried adjusting carb no change. Help I am out of ideas.
Pull off the exhaust, does the piston look ok?
If scored thats not good.
If ok check fuel filter , pressure test lines or remove and check for cracks. Just a start but check easy stuff 1st or get back to me with more info, cheers
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Find the gas/air adjustment screws on the carb (next to the the throttle cam where the throttle cable attaches. Turn the screws in all the way... GENTLY... Those are needle valves, and too much torque on them will damage the needle valve seats. turn both of them out one and a quarter to one and a half turns. Start the saw, and adjust one or the other screw in or out until the saw runs properly. If there is a plastic stop installed on the screws, remove it first, and replace it after the saw is running properly. You have to be patient while tuning the carb as it may take a while. If you adjust too much and the saw refuses to start at all, start over with the 1-1/4 to 1-1/2 turns out on the screws.
This is classic fuel starvation, start by removing the fuel hose from the tank and replace the filter on the end, if no better, it may be a tank breather issue, when the saw starts to die slacken the fuel cap, if the saw picks up you need to replace the breather, if no better you can make a small adjustment to the H screw on the carb, unscrew ( counter clockwise ) the H screw this will richen the mixture, you will need to pull the anti tamper sleeves back on the screws, this can be done by gently screwing a suitable self tapping screw into the sleeve, when it hits the screw head under neath the sleeve will start to pull back, once pulled half way off you can enter a 2mm screw driver through the centre if the sleeve and intp the slot in the adjuster screw underneath.
The temperature is not that different. Is there a fair change in altitude between the dealer and where you live? The jet screws have 'D' heads to prevent owner tampering--how did you adjust them? You need to allow the engine to warm up before pulling the throttle. Make sure the fuel mix is fresh and mixed 50:1 with synthetic chain saw oil--be sure to shake the container thoroughly just before filling the tank each time to prevent oil starvation. It has to be the manufacturer's problem because it is under warranty. It sounds like the jet screws are set fairly lean. Ask the dealer if you can buy the special 'D' head screwdriver to make your own adjustments. Hope this helps!
I think your on the right track Blowing compressed air through your tank vent is great but it is way more air than the natural asperation that the saw pulls on it own I would replace the vent cap and also look for a pinched fuel line between the fuel tank and the carb
Your carb may be the issue but your ignition coil could be the culprit. Once they start going bad, they can act up intermittently or give various symptoms from day to day. The fact that your saw dies at full load or under load, probably means that when your saw gets hot or requires more spark, your coil is not able to provide it. Your carb is easy enough to clean out, you can take it all apart and clean all screens, etc....
I just replaced my coil due to the exact same symptoms and now my saw runs great. $60 off ebay and you can put it on in 15 minutes yourself. Check your carb first though
An engine needs three things to run(fuel and air mixed together in the correct proportions,compresion of the fuel/air mixture and ignition).Make carb adjustments,check the compression and the spark from the sparkplug.Priming the engine(put some gas into the sparkplug hole).Try to start the engine.If engine is running only the gas from the cilinder,the chain saw has a fuel delivery problem.Disassembly the carb and clean the inner parts.Check the fuel and air filters,fuel hose and gas tank ventil.