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adjust the L screw in fully till right in,then out 1.5 turns,same with H screw.Then start saw,adjust L screw in or out slowly till you get max revs.You may need to lower idle via idle screw if revs too high.When screw cant acheive better revs,reset idle.Then,rev saw to max revs,adjusting H screw to get max revs,then when max revs acheived,turn screw anti clockwise 1/4 turn out.That gives it enough petrol to cool the tip of the plug
get it running on idle,adjust the idle down till it runs hairy,then adjust low speed mixture screw till you get it highest revs,then keep repeating that till you get it idling normal.rev saw up max revs,adjust high speed jet, in or out till you get max revs,then screw out one quater of a turn.That lets enough fuel thru to cool the sparkplug tip..If thats no good,redo the carbi.Check the tiny filter under the needlevalve hole.Check the needlevalve diaphragm height.recheck gaskets are right way round
Take the exhaust off so you can see the side of the piston, if it is scored or damaged it means it has probably been run without oil added to the petrol. That can cause the problems you are having, if it is throw it away, its not worth repairing
On thecarburetorgottwoscrewsto adjust thecarburetor.The first isto adjust thesawwhenworkingat highspeeds.Another iswhen runningat lowrevs.It is best toeitherput backfor about 1.5cycleofthe maximum ofthe end of therotationof thescrews.If thenthe sawstarts, thenyou canadjust itfineat higherrevs(H),thenat low(L).Havecan beminimumscrewthatstops thechain.
There are two types of choke systems, the basic choke has a ball and spring in the carb body which locks the choke either in or out, the other type is connected to the half throttle position, once pulled out it stays out, however if you lift the throttle trigger it will go back in on its own, queation, are you holding the throttle trigger whilst trying to start it, if so this is why it will not stay out, if this is not the case, pull the choke out with a little more force, it may be just not coming out enought to lock.
This does take a little time to get it just right. Start at one full turn for the h and l. Work on the high first and after you get the H running work on the Low. They have to work together. So if you get it to idle and run at full throttle but it hesitates when you pull the trigger just adjust the low a little higher.