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Author Topic: MS 250 carb issue  (Read 170 times)

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Offline azmtnman

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MS 250 carb issue
« on: November 01, 2017, 03:42:20 pm »
My MS 250 has about 5 hours on it (if that!) It quit running right and I put it aside a couple years ago and just got it back out to try to repair.
It would run fine for a few minutes then act like it was running out of gas so I changed the pump diaphragm. It's not as bad now but after it's warm, it won't run mid rpm--which includes getting through mid rpm to get high rpm. Once at high rpm, it runs and cuts fine as long as you keep it there.
What am I missing?
1983 LT 30, 1954 Ford NAA, 2006 Polaris 500 EFI, '03 Dodge D2500 Cummins powered 4X4 long-bed crew cab, Cummins powered '88 Chevy R30, Stihl MS250, MS311 and MS661--I cut trees for my boss who was a Jewish carpenter!

Offline ladylake

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Re: MS 250 carb issue
« Reply #1 on: November 02, 2017, 05:06:26 pm »
 
 If the low adjuster is too lean or the low circuit is clogged it will act like that.  Steve
Timberking B20 12000 hours +  Case75xt grapple + forks+8" snow bucket + dirt bucket   770 Oliver   Lots(too many) of chainsaws, Like the Echo saws and the Stihl and Husky     W5  Case loader   1  trailers  Wright sharpener     Dino setter Volvo MCT125c skid loader

Offline azmtnman

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Re: MS 250 carb issue
« Reply #2 on: November 02, 2017, 11:04:26 pm »
So it has like an idle jet?
1983 LT 30, 1954 Ford NAA, 2006 Polaris 500 EFI, '03 Dodge D2500 Cummins powered 4X4 long-bed crew cab, Cummins powered '88 Chevy R30, Stihl MS250, MS311 and MS661--I cut trees for my boss who was a Jewish carpenter!

Offline dougand3

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Re: MS 250 carb issue
« Reply #3 on: November 03, 2017, 12:38:50 pm »
Fully adjustable MS250 carbs have H, L and LA(Idle) screws. Some have fixed jets and can't adjust. Fully adjustable are available online for ~$10.
Husky 272xp, Husky 272 on Jonsered 630 case, Husky 55 (x4), CraftsPou 4218, Stihl 011AVT, Zenoah G2500