Project Stumpbroke MS290

A local customer of mine brought me a Ms 290 to modify. Not sure what kind of gains to expect out of it, but figured it's worth a try.

This thread is not a step by step rebuild thread. If I can find a link I'll post it. I beleive THall has a thread on how to rebuild one of these.

Just gonna post some picks of my work.

Pic of the motor in my vise with the degree wheel.
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Here's the numbers
Ex Dur-158*
Trans Dur-120*
In Dur-158*
Blowdown-19*

I've also got some timed cuts made before I tore it down. I'll post them later once I git the after times down, and report the results.

http://arboristsite.com/chainsaw/133453.htm
I think this is the link to The rebuild.

Some pics of the ports before.
Intake
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Exhuast
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After pics of the ports (sorry I didn't take any pics of the outside ports before)

Inktake
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Exhuast

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You can see I couldn't do much with the uppr transfers. The ring spaceing kept me from doin any more. I guess I could move the locator pins, but don't think it would be worth the effort.

I've got more work to do on it. Thinkin of welding up a small popup to improve the comp. Also got to gut the muffler & make it breath.

stumpyshusky said:

You can see I couldn't do much with the uppr transfers. The ring spaceing kept me from doin any more. I guess I could move the locator pins, but don't think it would be worth the effort.

I've got more work to do on it. Thinkin of welding up a small popup to improve the comp. Also got to gut the muffler & make it breath.

Click to expand...

Interested to see the gains... You bout ready to experiment on a 028? Oh, and the 460? Stihl lookin'... Sorry buddy...:msp_confused:

Hedgerow said:

Interested to see the gains... You bout ready to experiment on a 028? Oh, and the 460? Stihl lookin'... Sorry buddy...:msp_confused:

Click to expand...

Bring it on, No prob on the 460. Maybee I'll port my dad's Husky 460 & beat them all:msp_ohmy:

Looks good man, nice pics and all.

The guy is goin to be very surprised with he puts it back in the wood!

stumpyshusky said:

Bring it on, No prob on the 460. Maybee I'll port my dad's Husky 460 & beat them all:msp_ohmy:

Click to expand...

You know? I even lowered myself to calling the local saw shop and asking if they had any damaged or shelled 460's, and they acted like that just "never" happens!!! :msp_angry:
Psshhh... I'll bet they got a pile of them things in the back... You know there are hundreds of them things committing hary kary all over the ozarks...
:beat_shot:

I would have never guessed that the numbers would be that high on a stock ms290.

sunfish said:

Looks good man, nice pics and all.

The guy is goin to be very surprised with he puts it back in the wood!

Click to expand...

Thanks, hope yer right.

komatsuvarna said:

I would have never guessed that the numbers would be that high on a stock ms290.

Click to expand...

They do look good. I was able to take a good amount of meat ot of both ports. Should see some noticable gains.

stumpyshusky said:

They do look good. I was able to take a good amount of meat ot of both ports. Should see some noticable gains.

Click to expand...

They definitely need it! lol

komatsuvarna said:

They definitely need it! lol

Click to expand...

To quote saw troll... "they're overweight pigs"...

I'm still trying to find you a shelled 460 as well, my cousin thinks he has one, he had to go out of town for the weekend to a wedding. I guess I'm just going to have to load up and go over and see what he has for sure. He was positive he had two or three 044/440's and two thrashed 660's and one thrashed 066. I just got to convince him he needs to part with some of his junk.

The work on the 290 looks great. I've got to get that 133 over to you, so we can show that young whipper snapping 7900 who it's daddy is.

WOW I didn't think there was that much to remove out of those clamshells. I think I need to start reading and figure this porting stuff out. Those numbers don't mean anything to me so I need to do some reading here.

Great work on the ports.

.......subscribing opcorn:

I new we would convert you to running real saws. The addiction will get stronger as you test this saw and before you know it you will own a MS460:hmm3grin2orange:

Nice work:msp_thumbup:

Nice, do you have a TIG to weld a popup? I've been thinking of trying that someday.

I'll have to admit I made a mistake. I read the degree wheel wrong on the ex port. I read 99* it was actually 101*. guess I read the wrong side of the 100* mark. I caught the mistake checking the timing after porting. I lowered the intake to give me a lil more dur to catch it up to the exuast (the first wrong reading). Not sure if I'm gonna raise the ex or not. Sorry fer the mixup. Here's the stock & modded timing #'s

Stock
Ex dur- 158*
Trans dur- 120*
In dur- 158*
blowdown- 19*

Modded
Ex dur- 158*
Trans dur- 120*
In dur- 166*
blowdown-19*

parrisw said:

Nice, do you have a TIG to weld a popup? I've been thinking of trying that someday.

Click to expand...

Yep I got a Miller syncrowave 180. So far I've done 4 succesfull popups. I think I'll do a small popup & increase the ex dur a few deg & hope I don't sacrifice any torque.