Polesaw starting issue

[MartyJ76]

Got a HL75 polesaw, which despite much attention only starts from cold with L screw tight in, idles ok with L screw being released to steady tick over, then bogs down immedeatly on throttle. Confounded 2 strokes! Amazingly, time to time over a month, it will start with no choke or throttle first time as if by magic, and once warm time and time again.Familiar? Is it a carb diaghpram problem? As far as I remember any 2 stroke starting and idling fine is not a seal or leak issue? Any help be so grateful for....

[openspaceman]

10 minutes ago, MartyJ76 said:

Got a HL75 polesaw, which despite much attention only starts from cold with L screw tight in, idles ok with L screw being released to steady tick over, then bogs down immedeatly on throttle. Confounded 2 strokes! Amazingly, time to time over a month, it will start with no choke or throttle first time as if by magic, and once warm time and time again.Familiar? Is it a carb diaghpram problem? As far as I remember any 2 stroke starting and idling fine is not a seal or leak issue? Any help be so grateful for....

I had lots of trouble with mine and was ready to give up after stripping the carb and replacing the diaphragm, gaskets and needle valve. It still played up and a new Stihl carb was £90 but I saw L&S offered an aftermarket one for less than the price of the carb kit, fitted it and it  worked fine till I stripped the gears in the head.

 

 

Carburettor for Stihl FS75, FS80 Brushcuters - Replaces 4137 120 0600 | L&S Engineers

WWW.LSENGINEERS.CO.UK

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Carburettor for Stihl FS75, FS80 Brushcuters Quality, Non-Genuine Part Replaces OEM No. 4137 120 0600, 4137 120...

 

[MartyJ76]

Thank you. At least thats the homework done on price, Mine wore down the original spur sprocket to an absolute V, until it jammed. They offered up various refreshments on original design.  New sprocket from L&S and this time cupped washers worked, rarely binds but saves the sprocket if it does. 2nd hand gears few and far between but it survived this. 4137 120 0600 will check this. Best wishes

[openspaceman]

5 minutes ago, MartyJ76 said:

4137 120 0600 will check this

That is one of the original Stihl carbs, the non oem replacement is in the link