Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Stihl => Topic started by: Jason K on July 18, 2015, 07:16:42 pm

Title: Want to put in a MS390 Short Block in a MS290
Post by: Jason K 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


Thanks
Jason
Title: Re: Want to put in a MS390 Short Block in a MS290
Post by: jmester 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.
Title: Re: Want to put in a MS390 Short Block in a MS290
Post by: 660magnum 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.
Title: Re: Want to put in a MS390 Short Block in a MS290
Post by: Jason K 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.


Thanks
Jason
Title: Re: Want to put in a MS390 Short Block in a MS290
Post by: 660magnum on July 22, 2015, 10:46:59 am
Put new bearings and seals in
Title: Re: Want to put in a MS390 Short Block in a MS290
Post by: jmester 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.
Title: Re: Want to put in a MS390 Short Block in a MS290
Post by: 660magnum 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.
Title: Re: Want to put in a MS390 Short Block in a MS290
Post by: Jason K 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