Project Stumpbroke MS310/390

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Stumpys Customs

Stumpys Customs

Stumpbroke
Joined
Jan 16, 2010
Messages
5,203
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Location
south central MO
I've got a Stihl MS 310 here that I'll be building a 390 motor to put in it. I don't know why this series of saw interest me, but it's fun to see what I can make one do.
100_1148.jpg


Here's a vid of it stock with the 310 59cc motor.
[video=youtube_share;4_p4RSo_Ut8]http://youtu.be/4_p4RSo_Ut8[/video]
 
Last edited:
I'm gonna use a piston for a Stihl TS400. It's just a tad taller & has wider skirts (0.110" wider).:rock:
The squish with the stock piston was .031" and the TS400 piston had .023". I'll prolly weld a small popup on this to raise the comp a lil more.
100_1149.jpg

Should help with the performance on this saw.
 
I have a few buddies that run these saws and I almost bought one myself before I knew them. I'm glad I went the route I did, but can't help but wonder what could be done w/ these.

Whats wrong w/ the Windstar?
 
Here's some timing duration #'s

Stock MS390
EX-160*
TR-110*
IN-156*
BD-25*
SQ-.031"

MS390 With TS400 piston
EX-158*
TR-108*
IN-158*
BD-25*
SQ-.023"

MS 290 STOCK
EX-158*
TR-120*
IN-158*
BD-19*


I'll add the MS 310 #'s when I get the saw tore down. I think the upper transfers are gonna get raised several deg.
 
jropo said:
I have a few buddies that run these saws and I almost bought one myself before I knew them. I'm glad I went the route I did, but can't help but wonder what could be done w/ these.

Whats wrong w/ the Windstar?
Click to expand...

Actually I've been able to get quite abit out of this series of Stihl. I'm a husky fan myself, but also like to do stuff a lil outside the box.

That Windstar is full of motors & parts. 455 olds, 455 buick block, 454 chevy, and some SBC stuff.
 
I'll be watching this. . . I gotta do a buddies 310 soon, and I'll be using a Bailey's 039 kit. I like the TS 400 idea for sure.

One thing about these series saws, they have a buttload of velocity from almost no room around the crank. . . They do well opened up. :msp_thumbup:

Hurry up and finish this today Stump! :laugh:
 
Metals406 said:
I'll be watching this. . . I gotta do a buddies 310 soon, and I'll be using a Bailey's 039 kit. I like the TS 400 idea for sure.

One thing about these series saws, they have a buttload of velocity from almost no room around the crank. . . They do well opened up. :msp_thumbup:

Hurry up and finish this today Stump! :laugh:
Click to expand...

I've got to set this project aside till tonight. Got an ATV to work on outside & another local saw to repair. Gonna be a late night:msp_thumbsup:
 
Stumpys Customs said:
Actually I've been able to get quite abit out of this series of Stihl. I'm a husky fan myself, but also like to do stuff a lil outside the box.

That Windstar is full of motors & parts. 455 olds, 455 buick block, 454 chevy, and some SBC stuff.
Click to expand...

I kinda thought there had to be some potential there, ~ 60cc's thats a good size saw, most likely detuned for a cheaper sale.
I like that little 170 that I have and I did a points converision on a couple of 028WB's last year, nice saws, not anything I'd buy new.
Eventhough the 3 Huskys I bought are the last new saws I'll ever buy.

They do make good storage sheds don't they!
I might have to take over the wife's van for my SBF/BBF/5.0 Mustang parts! :laugh:
You got an ol' Olds or sumptin?
 
Very nice work you do stump. Glad to see you up and running again. Looking foward to the outcome of the saw build.:biggrin:
 
I went ahead & welded a popup on the piston. This thing has a big combustion chamber so I made the pop up 0.075'' tall.
Turned what I could of it on the lathe. The flat spot on the intake side I had to finish by hand.
100_1161.jpg

100_1162.jpg

Got the case all cleaned up & ready to put back together.
100_1165.jpg
 
Now for the fun part, gutting the muffler.
100_1164.jpg

I only cut half of the baffle out. THis acts as a small head pipe. Does it do any good?? Not sure but it isn't gonna hurt.
100_1172.jpg

100_1173.jpg

I Made the slot in the front of the muffler bigger & modified the deflector to flow more. I also added a port to the clutch side.
100_1174.jpg

100_1175.jpg
 

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