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I have been trying to diagnose a fault on a Husqvarna 435. The saw was initially running poorly and hot. It was taken for a serviced by a local company after which the saw wouldn't start. It was taken back. The company swapped the carb which didn't fix it then they said it might need a new piston and quoted a high price.. The owner brought the saw to me. The saw will fire but won't run for more than 1/2 second, even with direct priming with carb cleaner. The plug has been changed and it produces a healthy spark which jumps a gap. Compression was measured at 120 psi. The piston ring is free and piston skirt un-scored. There are some mystery scratch marks on the back of the cylinder opposite the exhaust post and on the front of the piston below the ring but they seem quite superficial and not enough to cause a problem. On removing cylinder, there were no foreign objects, nothing stuck in the transfer port, manifold and cylinder seemed in reasonable condition. There were dark marks on the piston skirts so I think there is some blow by past the ring. Just in case, I stripped the carb to look for obvious faults but all looked clean and in good condition. I have also tried every tuning point of H and L including the standard tune in am effort to get this saw to run at any RPM. Has anyone any suggestion where I should go from here? My feeling is that it needs a new piston or piston and cylinder but I am not at all sure. Thanks for any help

Hi all I've just recently passed my chainsaw crosscutting & maintenance and tree felling up to 200mm/8" (did bigger on the course though probably 11 - 12") I was hoping to use my qualification to make some money to pay of the damage of the saw, lessons and PPE, and hopefully start turning a profit . But I don't want to bite off more than I can chew with my saw, its a husqvarna 435 I think 41cc with a 16" bar. It was slow when stumping some of the bigger trees on the course which made me think about making this post. What sort of trees would the saw get through when crosscutting? When should I be thinking of a bigger saw? I obviously wouldn't be felling past 8 - 10" when working as im not qualified for that, however I have some trees of larger size that I might want to take down domestically. What sort of felling size would it go up to.

Hi Everyone I'm new here so please let me know if I make any mistakes. And yes, I have an issue I'm looking for help and advise on . After frustrations with my big old McCollough saw I forked out last year and purchased a brand new Husquvarna 435 saw I’ve been very happy with it I've used it regularly (weekly) fir cutting logs for my wood burner and da little light tree pruning. I've looked after it well keeping it fuel with fresh oil mix (Stilhl oil). Recently it developed a fault it would rev up properly but then within a short time it died initially it was intermittent and could be used for a while before dying but it got worse. After checking the obvious, the filters and muffler for blockages and a new spark plug I put the saw into the local dealer where I purchased for repair under warranty. I was surprised to be told today that the work won't be done under warranty that contaminated fuel has destroyed the diaphragm and it will cost over £100 to repair. I understand that chainsaws can be abused and if so a repair under warranty can’t be expected but this isn’t the case with this saw, I have looked after it well! Before taking to the dealer I checked the fuel filter in the tank and it was intact and clean. putting to one side for the moment that I have used it regularly and always used fresh fuel ( I live beside a fuel station so only purchase as needed) I really don’t understand what sort of contamination could damage the carburettor ? as said the fuel filter was clean and intact. I really feel disappointed, (and a little unbelieving) with this result and know I have only treated this saw with care as recommended. I’m on a low budget but paid the price for a Husqvarna believing that it was a good quality saw and, with proper care, would last and be worth the price in the long run. Is it possible to get a second opinion as this diagnosis just doesn’t make sense? Sorry for being long winded Well done and thanks if you have read it all