Question about Husqvarna 965142201 K750 5HP 12" Gas Cut Off

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Partner k750 will start but runs fast and wont idle down

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My dad had a similar HUSKY "Rancher" chainsaw. They are very high revving and tempermental and require fine adjusting the two screws which are in little holes in the plastic on the side, using a small screwdriver. One screw adjusts the amount of air and the other the amount of gas or there may be a single one to adjust both. This just sets your carburator for the idle rpm. He use to cut early in the morning when the saw was still at -25 degrees Celcius and the air at +25 C, so it would ice up the carburator for a while which of course changes all the idle screw mix settings. A lot of times it is in correct adjustment but the air filter gets clogged up with fine sawdust, so you just have to clean that with some gas or carry a spare clean one into the bush. Your's is a very big displacement so it will **** in great volumes of dust while working. With a clean filter you should be able to actually stall the saw by screwing the gas in too far. When the air adjust is according to the manual, you adjust the gas one outward or CCW untill the chain starts to nudge ahead - that is the TOO MUCH GAS amount. Now turn it back in untill it reaches a happy medium or smooth tone to the engine and doesn't sound like it will conk out. You don't want the speed to be such that when you pick it up and carry it through heavy brush that it will take nothing at all on the trigger to rev up to 20,000 rpm and cut your leg right to the bone! It's against IWA rules to move a running chainsaw even one step, but best to be safe as possible. One other problem I had was an internal fuel filter inside the gas tank on the end of a short rubber tube. When it clogged with fine dust, the saw had to pull too hard to get any gas, so the fine idle adjust screws didn't work until I cleaned the inside gas filter. This was a pain as it was an older Homelite where the aluminum two part chassis had to be unscrewwed to get at the gas filter inside and then put back together with a new paper gasket, which takes hours but has to be done. If all this checks out, it may be a wrong oil-gas mix or the gas is too old. It makes quite a difference to use a very small gas can and buy just a few cups of 94% octane just for 2 cycle gas-oil mixing in these saws especially if you only use them a little and then they sit for months. Also, watch out for the bottom of the saw when you set it down on a log with 1/4" knots sticking up - these can actually break through the bottom of the aluminum gas tank near the handle underneath some HUSKYs!

Posted on Mar 24, 2011

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1 Answer

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Sounds like a vaccum leak at the throttle body or the intake. check for loose lines hissing with the motor running. Had a brake booster line come loose on my 92 and it ran at about 3000 rpms.

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