Correct adjustment Dies when on high revs

You have to adjust the H needle on the carburetor. Quarter turns, when adjusting the high, the H needle, you have to hold the trigger in, throttle high... if it bogs, turn the h a little at a time and depress the trigger slowly until u hear the sweet spot...very simple fix.

are you sure you have the right spring fitted?? and have you tried adjusting the spring tension? you can do this by bending the arm that the govenor spring attaches to as seen in this picture

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

Both should be set at 1 and a half turns out to start. Turning the screws out will richen. Turning in will lean. If its hard to start or boggs/ dies when you throttle then its lean- turn the low out another half turn. If it revs up for a minute then slows down richen up the high. At full throttle you still want to hear a bit of a cackle- adjust the high

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

Have you replaced the fuel filter in the tank? it will idle as the engine is not calling for much fuel, however at full revs it calls for a greater amount of fuel, if that fuel is not available the saw dies.

turn the high speed and low speed mixture screws right in[gently]then out 2.5 turns.start it up,screw the idle screw up till it will idle,then adjust low speed mixture screw in or out so you get the highest idle.keep lowering the idle so as you adjust the screw,it wont get it any higher in revs.so by now it should idle.next,open the throttle wide,and adjust the high speed screw until you get maximum revs..then,turn screw 1/4 turn out.that makes it slightly richer,cooling the plug with droplets of petrol.you dont want it lean.if it wont rev fully,check the fuel filter.they get dirty quite often

the units came out with EPA carb's some have idle screw adjustment and preset high jet, or the other way depending on the unit. try and change the fuel, use only high octane fuel for 2 cyc no ethanol with fresh oil mix, run for about 5 to 10 min's. if your carb has adjustment screws set your low side idle screw but still change the fuel.

Screw both screws right in (don't force them) Then turn each screw out 1 & half turns each OUT. This will get engine running. To fine tune- turn low speed screw out, bit by bit, while idling, till engine revs change, then turn screw in till revs change, the correct setting will be somewhere between the 2 adjustments you just made. Do the same thing to the high speed screw, but with full revs. Good Luck. Stevo..

As with all 2 strokes if you have compression and a reasonable spark, you only need fresh fuel with correct oil ratio) and they must go !(as long as you haven't fiddled first and all gaskets are sealing) I start mine by(1) pumping the primer till it is firm,(2) full choke,(3) pull till it kicks ONCE,(4) half choke, pull till it runs,allow to warm up and(5) switch to run (you may need to apply a bit of throttle while pulling as in (4)(or give it a few more pumps if it dies) If all is ok, check that when properly warmed up there is a smooth transition from idle to full revs, if it hesitates it may need the LOW SPEED mixture leaning (clockwise) SLIGHTLY.If it dies the LOW SPEED mixture may need richening(anti-clockwise)(adjust 1/8 turn at a time) Make sure that motor is just peaking at full revs and is on the RICH side of peaking (HIGH SPEED mixture)(this will avoid seizing it Adjust both till it revs cleanly and is JUST rich at full, and idleing nicely and it should start without too much trouble.(If you have fiddled and are lost,-about 2 1/2 turns out from closed on both needles should get you started)