tuning/modifying an ms 390

[william127]

Iv had my ms 390 for about 7 years and its done a medium amount of work and is still in great condition but I now mainly use my291 so id like to give tune up and maybe modify it a bit but still leave it useanble for day to day logging etc.

Where would you recommend I start and where I could buy any uprate d parts I might need? Thanks, William.

[Stubby]

Iv had my ms 390 for about 7 years and its done a medium amount of work and is still in great condition but I now mainly use my291 so id like to give tune up and maybe modify it a bit but still leave it useanble for day to day logging etc.

Where would you recommend I start and where I could buy any uprate d parts I might need? Thanks, William.

 

The best place to start is to pm Spud . He will tell you what they respond to and if its worth it . Not sure if I should mention the " P " word but he is your man .

[Rich2484]

No parts are able to buy upgraded as such.

 

And exhaust mod will be good. Get those baffles out. Plus if your handy with a welder its a good idea.

 

Pm spud.

[Eddy_t]

Muffler mod, gains are huge even if you leave the baffle in, check arboristsite, there are loads on there

 

 

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[spudulike]

Yes, it is a clam type engine and they are not the easiest saws to work on. Personally I would just do a muffler mod as others have suggested and see how much that gives you.

 

You won't be able to lower the squish and actually getting to the cylinder is not a job for the inexperienced...no disrespect to you!

[william127]

Ok I'll just have a go at the muffler then, is there a particular model of stihl that would be good for an inexperienced tinkerer to have a go at? I fancy getting a spares or repairs project of some sort. Thanks, William.

[spudulike]

Ok I'll just have a go at the muffler then, is there a particular model of stihl that would be good for an inexperienced tinkerer to have a go at? I fancy getting a spares or repairs project of some sort. Thanks, William.

 

You will find the 026 a fair bit easier and lots of spares about! Not done too many Stihls apart from MS200Ts. I like doing Huskys down to the design leaving a lot of margin to improve!

[Rich2484]

Yeah 026 I s the easiest. Most other exhausts are a pinched seal around them. That needs to be prized open, this is a pita and guaranteed you will destroy most of the edge doing it.

 

The stihls don't leave a lot for porting.

[SawPro]

Ms390 is a big semi pro plastic chainsaw saw! Leave it alone as you will only ruin it.

[gensetsteve]

I have had 2 exhaust fall to bits on my ms390 when they fall to bits it goes alot better so I would guess an exhaust mod may work.