MS250 Doesn't Like to Rev if Cold

[adamelder]

I've rescued a neglected MS250. Got it running fine except it won't rev when first started from cold. It wants to sit on idle for a good 10 mins before it'll let me rev it up at all.

 

Otherwise, the slightest press of the throttle causes it to die.

 

Anyone got any advice on this?

[monkeymoreton]

Sounds like its running either lean or rich this could because of a Air leak or maybe your exhaust has come loose.

 

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[adamelder]

I've rescued a neglected MS250. Got it running fine except it won't rev when first started from cold. It wants to sit on idle for a good 10 mins before it'll let me rev it up at all.

 

Otherwise, the slightest press of the throttle causes it to die.

 

Anyone got any advice on this?

 

Once it revs, it goes absolutely fine. Plenty power.

[spudulike]

Probably lean, just service the fuel system and see what that does.

[adamelder]

Probably lean, just service the fuel system and see what that does.

 

Thanks for that Spud. Help me out a wee bit more please. What's the steps to servicing the fuel system?

 

If it's too complex, I'll take it to the Stihl dealer where I live. But I'm reasonably handy and up for a challenge.

[adamelder]

Thanks for that Spud. Help me out a wee bit more please. What's the steps to servicing the fuel system?

 

If it's too complex, I'll take it to the Stihl dealer where I live. But I'm reasonably handy and up for a challenge.

 

So, would I be right in thinking:

 

Check fuel filter and line

 

Clean out carb

 

Replace the diaphragms/gaskets in the carb and fuel screen.

 

Found a youtube video that seems to explain it all.

 

What could possibly go wrong?!

[Harry_L]

What could go wrong... famous last words. [emoji23]

 

 

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[adamelder]

What could go wrong... famous last words. [emoji23]

 

 

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Indeed! The saw was in a terrible state when I found it in a chum's garage. Wouldn't start at all. I've got other Stihl saws that are shiny and new-ish so I've got nothing to lose on this one.

 

I've taken it to bits to the best of my ability, replaced worn out parts etc and got it running fine apart from this last glitch.

[Harry_L]

Good on you! Must feel good once you have restored a saw!

 

 

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[spudulike]

So, would I be right in thinking:

 

Check fuel filter and line

 

Clean out carb

 

Replace the diaphragms/gaskets in the carb and fuel screen.

 

Found a youtube video that seems to explain it all.

 

What could possibly go wrong?!

 

Sounds about right and make sure you change the gauze strainer or fuel screen as they call it!