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Author Topic: Want to put in a MS390 Short Block in a MS290  (Read 970 times)

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Offline Jason K

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Want to put in a MS390 Short Block in a MS290
« on: July 18, 2015, 07:16:42 pm »
Does Stihl make a MS390 short block and what would I need change it to the MS390. If so what does Stihl get for a short block


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Jason
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Offline jmester

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Re: Want to put in a MS390 Short Block in a MS290
« Reply #1 on: July 19, 2015, 07:22:55 am »
If the crank and engine pan are good in your 290 than all you would need is the 390 piston and cylinder. Mako is a good aftermarket piston and cylinder for the 1127 series saw.
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Offline 660magnum

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Re: Want to put in a MS390 Short Block in a MS290
« Reply #2 on: July 19, 2015, 07:57:03 am »
Its just a plug and play situation. The MS390 cylinder is just like the MS290 on the outside as far as everything being in the same place.

This is a very common swap.
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Offline Jason K

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Re: Want to put in a MS390 Short Block in a MS290
« Reply #3 on: July 22, 2015, 09:04:41 am »
Ok, Thanks guys. Should I install new bearing too if so what one is the ones that does not have the platic roller cage. Please let me know part numbers too.


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Jason
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Offline 660magnum

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Re: Want to put in a MS390 Short Block in a MS290
« Reply #4 on: July 22, 2015, 10:46:59 am »
Put new bearings and seals in
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Offline jmester

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Re: Want to put in a MS390 Short Block in a MS290
« Reply #5 on: July 22, 2015, 12:20:27 pm »
9639 003 1743 seal part number
The bearings are 6203 both pto and fly side are the same.
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Offline 660magnum

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Re: Want to put in a MS390 Short Block in a MS290
« Reply #6 on: July 22, 2015, 12:27:28 pm »
What Stihl calls the "pan" and us normal folk call the bearing cap will be distorted. I put some 320 wet or dry sand paper on a sheet of glass and level the surface of both the bearing cap and the cylinder before putting on a thin coat of Dirko and assembly.
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Offline Jason K

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Re: Want to put in a MS390 Short Block in a MS290
« Reply #7 on: July 23, 2015, 02:27:35 pm »
I will do that 660. I just more power. Thanks for the part numbers. I want to make sure. The Stihl dealer said $225 p&c for the MS390. I am finally come to the end to of my projects. :'(


Jason
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