MS 171 issue

[Mark Bolam]

My mate (amateur) has a 171 that starts fine, but dies as soon as he squeezes the trigger.

Ideas?

Stored with fuel in for a while, which I've told him to bin and replace with fresh mix.

[Dan Maynard]

"asking for a mate"

You've bought yourself a 171 haven't you?

[Stubby]

Come on . own up Mark . Its yours innit ! ?

[Ratman]

Take no notice Mark, they’re only avin a pop cos its badge starts with a “S” and not a “H”

[bmp01]

...engine too small to drive the chain, buy a bigger, pro model saw....

[spudulike]

And I believe it is his biggest saw?

[Mark Bolam]

Alright you fuckers, next question.

Should I, I mean my mate, consider trying a smaller bar than the 48” one?

[Stubby]

1 minute ago, Mark Bolam said:

Alright you fuckers, next question.

Should I, I mean my mate, consider trying a smaller bar than the 48” one?

No Judst put a 15 pin sprocket on . Will be fine with a check shirt . 

[Ratman]

Alright you fuckers, next question.
Should I, I mean my mate, consider trying a smaller bar than the 48” one?

Long as it has “farm boss” printed on it, it’ll muller anything!

[spudulike]

Oh dear, I guess we need to think about the issue - sounds like the carb isn't supplying enough fuel. The most common reason is fine chip in the carb gauze strainer. Other less likely issues are split fuel line, fuel filter or air leak.

I would normally pull the carb apart, check the metering arm height, the ability of the needle valve to seal, the gauze strainer and both diaphragms. A good clean with carb cleaner and you should be good to go. Pull the strainer out and look at it through a magnifying glass as they can often look clean but are not.