Stihl MS 250's

Wesspur
Rugged made
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Up date..... The new ms 250 now has 3 tanks of fuel through it. Starting procedure is has follows, Full choke pull twice, 1st pull no false start, 2nd pull the false start can barely be heard , but it is there. Move control lever to high idle 1st pull nothing, 2nd pull it starts and runs great. If you leave it on full choke and pull 3 times it's flooded.
The saw runs great 16 inch bar, 3/8 LP full chisel chain, the cuts are smooth and fast.
 
anderson3754 said:
Up date..... The new ms 250 now has 3 tanks of fuel through it. Starting procedure is has follows, Full choke pull twice, 1st pull no false start, 2nd pull the false start can barely be heard , but it is there. Move control lever to high idle 1st pull nothing, 2nd pull it starts and runs great. If you leave it on full choke and pull 3 times it's flooded.
The saw runs great 16 inch bar, 3/8 LP full chisel chain, the cuts are smooth and fast.
Click to expand...
Mine is hopelessly flooded at two full choke pulls. Remove plug, turn it over and cycle to clear gas.
I have yet to figure out a reliable starting sequence.
 
sundance said:
Getting really tired of it getting so locked up I can't even pull it.
Click to expand...
Sounds like you may have a carb needle and seat problem. To prove or disprove this theory perform a pressure test on the fuel inlet to the carb. Carb should hold 7-10 psi indefinitely. If it leaks down you have a direct path for fuel from the tank into the engine i.e. flooding.
 
SteveSr said:
Sounds like you may have a carb needle and seat problem. To prove or disprove this theory perform a pressure test on the fuel inlet to the carb. Carb should hold 7-10 psi indefinitely. If it leaks down you have a direct path for fuel from the tank into the engine i.e. flooding.
Click to expand...
@SteveSr , I don't have equipment for a pressure test. Cheap source? Or a work-around?
 
sundance said:
@SteveSr , I don't have equipment for a pressure test. Cheap source? Or a work-around?
Click to expand...
You can also use a sports inflator (or bicycle pump) if it has a gauge on it and doesn't leak by itself. You can test it before you buy it by plugging the output hose. Or make one with a few simple parts like Harley shows above.
 
HarleyT said:
Just try starting it with no choke first off.
If it doesn't hit, then try a light pull with the choke on, then follow with several pulls with the choke off, and see what happens.
Click to expand...
Tried it today, no choke. Started after 6-8 pulls. Reckon this will be my plan until I can pressure test the carb. Depending on that, be curious to see what happens when it gets colder,
 
sundance said:
@HarleyT @SteveSr
Pressure tested today. Pumped it up and watched it slowly bleed down starting immediately. Reckon a new carb is on the agenda.
Click to expand...
Depending on the carb model you can probably just put in an OEM kit for considerably less. The only carb that I wouldn't kit would be if it had a fixed "H" jet. Which carb do you have?
 
SteveSr said:
Depending on the carb model you can probably just put in an OEM kit for considerably less. The only carb that I wouldn't kit would be if it had a fixed "H" jet. Which carb do you have?
Click to expand...
To be honest I wasn't smart enough to verify when I was testing. According to the IPL it "should" be a Zama C1Q-S85B.
 

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