Need some help on my new to me MS260

[wendell]

Just picked it up last night and the guy said it had been sitting 6 months so I didn't want to run it with the old gas so just got it fired up tonight. It starts fine and starts to idle fine but then it starts slowing down rather quickly and then dies.

I don't have time to dig into it tonight but wanted to see what to check tomorrow.

Thanks.

 

[2000ssm6]

After resetting the carb back to specs, I'd check the fuel line and filter. That old mix could have ate them up already.

 

[fearofpavement]

Is it quitting at idle or while your revving it? If it will run at higher speeds I would try doing some cutting with it for a while and maybe it will clean the crud out of the fuel system and carb.

 

[nmurph]

crank seal

 

[wendell]

It is quitting at idle. It is a little balky when pulling the trigger but seemed to get to WOT OK.

 

[bigbadbob]

Toss a carb kit in,, cheap.
The diaphgram etc may be hard.
I have a 026 that is a bear to tune and doesnt like altitude changes.
IMHO

 

[brages]

Clean carb, check the position of the screws -- idles for a little bit, then loads up and dies sounds like too rich in the "L" circuit to me.

 

[wendell]

Thanks, all. How many RPM's should it be set for at WOT?

 

[blsnelling]

14,000

 

[wendell]

Thanks!

Also, in the manual it says some models need the L turned out 1/4 turn, on others it is 1 turn. How do you know which model you have?

 

[blsnelling]

If it has no limiter caps, bottom it out and then back it out 1 turn.

 

[wendell]

Actually, it has 1 turn stamped right on the filter cover.

BUT, the slot above both the H and L are blocked off and there is only 1 screw showing and it is between the H and the L. ???

 

[brages]

there is only 1 screw showing

That is the "L"; you have a fixed "H" jet. My condolences.

 

[wendell]

Who the #### would make a saw with a fixed H. Especially in a pro saw.

 

[FATGUY]

Who the #### would make a saw with a fixed H. Especially in a pro saw.

you'd be surprised...

 

[Anthony_Va.]

Lol, yea. They areterrible to do anything with IMO. I'm going to swap my carb out for the one that has the adjustible H. 60 bucks new on Ebay. Then you can mod the muffler. No modding can be done on that saw until it's changed.

 

[brages]

Observations from other threads I have read:

1. You can swap out for a larger H (main) jet. ~$5
2. You can drill out your main jet. I think the stock is 0.054 (?)
3. Supposedly, the stock is pretty rich; you may be able to get away with a muffler mod with it.
4. I am getting a used WT-194 fully adjustable carb from member/sponsor bcorradi for quite a bit less than the ebay price... :spam:

 

[Anthony_Va.]

Observations from other threads I have read:

1. You can swap out for a larger H (main) jet. ~$5
2. You can drill out your main jet. I think the stock is 0.054 (?)
3. Supposedly, the stock is pretty rich; you may be able to get away with a muffler mod with it.
4. I am getting a used WT-194 fully adjustable carb from member/sponsor bcorradi for quite a bit less than the ebay price... :spam:

That is your ticket my friend!

 

[bobt]

It is quitting at idle. It is a little balky when pulling the trigger but seemed to get to WOT OK.

Before you go doing anything really drastic like getting a new carb, this sounds like a lean condition on the low speed. You said your saw hesitated when throttled up and didn't idle for long. That is a classic low speed lean symptom. I would open the low speed jet a bit. The saw may idle and accelerate correctly with this simple adjustment. You will probably have to adjust the LA screw as well.

Bob

 

[stipes]

Lol!!!

you'd be surprised...

Like who the **** stuck their thumb in the cheese...LOL!!! Hi Nik!!!