Author Topic: ms 250  (Read 189 times)

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Offline jmester

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ms 250
« on: October 04, 2013, 10:22:24 am »
Does any one know what the oversized oil pump part number ? Not flow but over all size. Have a sloppy hole.
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Offline 660magnum

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Re: ms 250
« Reply #1 on: October 04, 2013, 10:42:11 am »
1123 640 3201
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Offline jmester

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Re: ms 250
« Reply #2 on: October 04, 2013, 10:48:56 am »
Thanks,So are the numbers after the part # like .55/.65 the size and not the flow.
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Offline 660magnum

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Re: ms 250
« Reply #3 on: October 04, 2013, 11:40:15 am »
.65 is the flow of the high volume pump

Everyone and his brother is selling a Chinese copy of both pumps. Some of the after market pumps are selling for $5.95.

From Stihl, they are more costly obviously.

The 3200 is the low volume .55 pump
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Offline 660magnum

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Re: ms 250
« Reply #4 on: October 04, 2013, 11:45:02 am »
I'm not so sure what the .55 & .65 mean?

In the MS 250 service manual it says "approx. 7.5 cc/min (0.46 cu in/min) at 10,000 rpm" with no mention of high or low volume pumps.
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Offline Fish

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Re: ms 250
« Reply #5 on: October 04, 2013, 12:25:03 pm »
It will not take care of a sloppy fit.  There are a bunch of good used crankcases around.

Offline jmester

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Re: ms 250
« Reply #6 on: October 04, 2013, 07:00:07 pm »
.55 and .65  should be the stoke of the pump then. So a new or used case is the only way to fix it then.
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Offline jmester

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Re: ms 250
« Reply #7 on: October 05, 2013, 10:14:15 pm »
Fish, are you saying that you have some.
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Offline 660magnum

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