High Quality Chainsaw Bars Husqvarna Toys

Ms290 problem

Deeretick

OPE Member
Local time
9:22 AM
User ID
106
Joined
Dec 23, 2015
Messages
26
Reaction score
23
Location
Indiana
I was working on the tune of my MS290 and somehow I managed to break the top of the h screw off in the carb. Now what do I need to do?
 

DSS

widebody
Local time
10:22 AM
User ID
39
Joined
Dec 19, 2015
Messages
1,848
Reaction score
8,510
Location
canuckistan
Is it broke flush? Hard to get out, you might need a carb
 

DELETED (Struggle)

Pinnacle OPE Member
Local time
8:22 AM
User ID
265
Joined
Dec 26, 2015
Messages
596
Reaction score
1,577
Location
iowa
They make very small reversible drill bits. The problem is it is extremely hard to keep a drill bit dead center on the broken needle. Your option is to drill it out that way but to install it in a vise on a drill press to help keep it centered. IF you don't have access to that then you might just as mentioned above have to get another carb.
 

fearofpavement

Pinnacle OPE Member
Local time
9:22 AM
User ID
304
Joined
Dec 28, 2015
Messages
1,805
Reaction score
6,226
Location
Georgia
Country flag
If you can get it out, someone can probably come up with another screw. I have a carb here somewhere off that series of saw with a broken off screw but don't know offhand if it was the L or H screw. I tried unsuccessfully to remove it (not a real valiant effort however)
If you can find a piece of metal tubing that fits around the diameter of the screw, you can make a drill guide to help drill it on center...
 

DELETED (Struggle)

Pinnacle OPE Member
Local time
8:22 AM
User ID
265
Joined
Dec 26, 2015
Messages
596
Reaction score
1,577
Location
iowa
You might also very carefully trying to super glue another small Brice of metal onto what's left of the fastener and see if it will enough to back the screw out.

You can buy the needle screws from Stihl.
 

Deeretick

OPE Member
Local time
9:22 AM
User ID
106
Joined
Dec 23, 2015
Messages
26
Reaction score
23
Location
Indiana
It's broken off flush with unsuccessful attempts to get it out. I will be looking for a carb. Thanks for the input.
 

fearofpavement

Pinnacle OPE Member
Local time
9:22 AM
User ID
304
Joined
Dec 28, 2015
Messages
1,805
Reaction score
6,226
Location
Georgia
Country flag
If you're tightening the screw into the carb, it's very important to not seat it hard as that can/will damage the jet area. Not sure how yours broke but fyi.
 

Deeretick

OPE Member
Local time
9:22 AM
User ID
106
Joined
Dec 23, 2015
Messages
26
Reaction score
23
Location
Indiana
I am definitely a novice tuning chainsaws. All the tips and tricks are greatly appreciated!
 

Deeretick

OPE Member
Local time
9:22 AM
User ID
106
Joined
Dec 23, 2015
Messages
26
Reaction score
23
Location
Indiana
I don't think I can get a dremel down in there. I will give it a try.
 

Genius

First member of ASlite to receive a infraction
Local time
9:22 AM
User ID
355
Joined
Dec 31, 2015
Messages
3,845
Reaction score
23,947
Location
Uncle Willys basement
Country flag
For the price of a AM carb, it's hardly worth messing with it.

I've been very happy with all the AM carbs that I've used
 
Top