MS 290 becomes MS390

[AZLOGGER]

Well I finally did it, converted a fairly good MS 290 to a MS 390 with a MM. I had a MS 290 that was straight gassed, P/C not good at all, so I installed a complete new 039 engine on it. I did a MM but as you can see a little different approach than some of you AS members have done. The original owner ran out of mixed gas, so he used straight gas to finish out a load of firewood (not a good oop:'n idea) he said that he didn't think a little straight gas would hurt it for a few more cuts (wrong). I also put the MS 390 carb on it along with a MM, I started it up to re-tune it and this sucker does not even sound like a STIHL chainsaw any more. Well better go out and find the sweet spot on the carb adjustment.

 

[atvguns]

Here is the pics

 

[AZLOGGER]

Thanks Atvguns, I was not aware they did not show on my post.
:eyeroll:

 

[mama]

Ms-290

Looks good , how much was the 390 engine.

 

[nmurph]

nice....you can go bigger with the MM.......did you change the jets in the carb?

 

[AZLOGGER]

Looks good , how much was the 390 engine.

I've had it for awhile I believe I paid $225.00 for it. :freaked-out:

 

[southbound]

Nice!!!!!!!!!!!!!!!

 

[epicklein22]

Just did a similar conversion. I need to put some time behind it this weekend and make sure all is good to go.

I hope Baileys comes out with the aftermarket 039 kit soon, it will surely make fixing 029's a more worthwhile endeavor.

 

[southbound]

+1

 

[AZLOGGER]

nice....you can go bigger with the MM.......did you change the jets in the carb?

No I did not because I used the 390 carb and it adjusted out great, the MM gave it some added RPM's and torque in the cut.

BTW Were you the one looking for a pristine 2094 Jonsered, I think I may of found one, with less than 6 hrs on it.

PM me if interested. :fingers-crossed:

 

[nmurph]

No I did not because I used the 390 carb and it adjusted out great, the MM gave it some added RPM's and torque in the cut.

BTW Were you the one looking for a pristine 2094 Jonsered, I think I may of found one, with less than 6 hrs on it.

PM me if interested. :fingers-crossed:

sorry, you've got the wrong saw hoarder.

 

[NEK VT]

what is an MM?

What does MM stand for?

 

[us2bnuts]

MM= muffler modification. drilling holes in the muffler to allow the motor to breathe better and rev higher.

 

[NEK VT]

oh ok

oh ok...thanks!

 

[redunshee]

I'd like to know how to change jets in a carb. What's he referring to?
Bob