Mculloch MT300x Strimmer will not run at full throttle?

Hi,
I have obtained an old, good coniditon2 stroke petrol strimmer.
All parts look functional and in goods condition.
When I start it it runs at slow tick over but as soon at I open the throttle it cuts out.
It sounds like it could be a fuel supply problem and I can see on the carb only an adjustemnt screw for slow running, there is two other what look like like adjusing screws but I am not able to move these. Are these the adjusting screws for the air/fuel mixture??
Can any one help, is it possible to e-mail me an instruction / service manual??
I know this is an old model engine but I would think that McCulloch would have used this design of two stroke engine on many later and possibly current tool systems.

Regards
Bill

Bill, June 2006

for a practical measure of two stroke fuel using 40:1, mix 500ml petrol with 12.5ml oil

steve, July 2008

you need to mix the petrol and oil at a ratio of 40:1 ie 5 litres of petrol to 0.125ml of oil

chopper, June 2008

michael the ratio is 40:1
jimmy

jimmy, June 2006

Sorry i mean Mculloch B400128-07 Petrol Strimmer

Michael, June 2006

Its strange but i can't find out what the oil to petrol ratio is for a McCulloch B4000128-07 Petrol Strimmer is.
Does anyone know,

Thank you,

Michael

Isle of Man

michael, June 2006

http://www.gardenbanter.co.uk/showthread.php?t=145951
This item has most of the info you require,good luck

jimmy, June 2006