best ms 250 carb?

[Pioneer]

That grommet for the walbro carb is part number 1123 123 7500 according to DIY spare parts. Should look something like this. I just replaced a wt-215 on an 025 with one from farmertec, working ok so far. I did have to turn down the diameter of the idle screw head, it was too fat to fit in the grommet. About 1-1/4 turns out for both h/l. Came with over 2 out of the box, crazy rich.

 

[Joseph Huckabaa]

That grommet for the walbro carb is part number 1123 123 7500 according to DIY spare parts. Should look something like this. I just replaced a wt-215 on an 025 with one from farmertec, working ok so far. I did have to turn down the diameter of the idle screw head, it was too fat to fit in the grommet. About 1-1/4 turns out for both h/l. Came with over 2 out of the box, crazy rich.


View attachment 1145725

Thanks for that part number and that tuning tip.

 

[JD Guy]

Glad this thread resurfaced. I need to replace carb on my MS 250 and all the information I is right here!
Thanks

 

[SteveSr]

Thanks for that part number and that tuning tip.

BTW, you should also muffler mod that saw if you haven't already. The Pre-EPA outlet under the gills measured 0.642" x 0.865".

 

[SteveSr]

That grommet for the walbro carb is part number 1123 123 7500 according to DIY spare parts. Should look something like this. I just replaced a wt-215 on an 025 with one from farmertec, working ok so far. I did have to turn down the diameter of the idle screw head, it was too fat to fit in the grommet. About 1-1/4 turns out for both h/l. Came with over 2 out of the box, crazy rich.


View attachment 1145725

I don't think that this is the correct grommet for the 250 as it doesn't have the holder in it for the new style tank vent. This looks to be for the 025 with the grub screw hose vent.

I THINK that you want part #13 below. I think that the screws are next to each other on the Walbro.

 

[Lightning Performance]

Used these carbs on an 018 and 180s with mods.
Who has a bolt-on update for these to replace an 025/250 but slightly bigger?

 

[Lightning Performance]

BTW, you should also muffler mod that saw if you haven't already. The Pre-EPA outlet under the gills measured 0.642" x 0.865".

That pinhole one is easily cut out.

 

[ZeroJunk]

That grommet for the walbro carb is part number 1123 123 7500 according to DIY spare parts. Should look something like this. I just replaced a wt-215 on an 025 with one from farmertec, working ok so far. I did have to turn down the diameter of the idle screw head, it was too fat to fit in the grommet. About 1-1/4 turns out for both h/l. Came with over 2 out of the box, crazy rich.


View attachment 1145725

We stock the carbs that work with those as well as the 0603 where the low and high needles are further apart and the grommet holds the tank vent as well.
I replace it with whatever was on it. Both of those are fully adjustable. So, I'm not sure why one would be better than the other.
The majority lately have no high adjustment at all, just a reverse thread to increase the idle speed.
Not crazy about those, but they work OK until the jet stops up.
Which it will, if you only use them periodically.

 

[Pioneer]

Stevesr you're right, the 7503 grommet would fit the ms250 with the remote tank vent. I had forgotten about the vent change up on the ms250 vs 025. It would just flop around inside the air filter housing without the cup part.

 

[Joseph Huckabaa]

I got my carb yesterday and put it on. Set the adjustment at stock and after a couple of pulls it fired right up and did some fine tuning on it after it warmed up. Still have to tune it in the wood but all good so far. I Haven't really done any muffler mods to it. I did pull the clogged spark arrestor out a couple of years ago.