chain sticking issue on Stihl MS250 need advice

[SawdustKing]

I cleaned up the carb on my new to me Stihl MS250, and it worked well at first. After an hour of cutting, the chain stopped moving when I throttled up. A few quick revs helped, but the problem kept coming back. I took it to a shop, and after checking the bar and chain, they said the clutch and sprocket looked good. The bar tip sprocket was kind of stuck, so I cleaned out a bunch of gunk, and it started spinning better. Put everything back together, and after a few throttle hits, it was working smoothly again.

I'm still getting the hang of using saws, any advice on what else I should check or do?

 

[Stihl 99]

Sounds like a clutch slipping when I read this.
Did the saw bog down while reving it or did it go to full throttle?
If the bar tip was that clogged and stopped the chain from turning, the saw should have revved like the brake was one.

 

[TheSpy]

Just keep the chain tension right and make sure the bar oiler's working, and clean around the clutch and sprocket more often. That should keep it running smooth and consistent.

 

[Leon Couper]

What I do when cleaning my bar is clean the bar groove as well. You can may a tool
to do this out of a hacksaw blade and just grind a point on it the depth of the groove
in you bar. Some of the racker gauges came out with one on the end of them.
You will find you will get a load of gunk out of there as well. Also there is most times
a hole by the sprocket end a pump of light grease or oil in there does wonders.

 

[STIHLTECH]

Common issue in certain woods.
Clean the bar as stated.
We find that a little rev of the saw between cuts helps when having this issue. Don't hold it open for a long time. Just a couple of revs to clear the nose.

 

[Deleted member 121]

I cleaned up the carb on my new to me Stihl MS250, and it worked well at first. After an hour of cutting, the chain stopped moving when I throttled up. A few quick revs helped, but the problem kept coming back. I took it to a shop, and after checking the bar and chain, they said the clutch and sprocket looked good. The bar tip sprocket was kind of stuck, so I cleaned out a bunch of gunk, and it started spinning better. Put everything back together, and after a few throttle hits, it was working smoothly again.

I'm still getting the hang of using saws, any advice on what else I should check or do?

Is there a hole in the bar at the center of the nose sprocket? When I was younger and faithful, They (oregon, Echo, I bet stihl, and others) make a pointed push grease gun to grease the sprocket

 

[blades]

that grease gun is still made- . wood fines do get into the sprocket and bind things up. i use diesel to flush a bound up sprocket. I rotate the sprocket back and forth while adding more flud until it will spin nicely and then grease it. Grease port is usually offset from the center a bit

 

[madpogue]

Late to the party, but.... that grease port HAS to be off-center. The center is the axle on which the tip sprocket rides.

 

[STIHLTECH]

What grease port. Stihl did away with those years ago.

 

[madpogue]

What grease port. Stihl did away with those years ago.

How many years ago? "New to me" implies that it's secondhand. The model number has been around, what, 18-ish years? 'Course, it could also have an aftermarket bar.

 

[Joshua Lenz]

Common issue in certain woods.
Clean the bar as stated.
We find that a little rev of the saw between cuts helps when having this issue. Don't hold it open for a long time. Just a couple of revs to clear the nose.

I just had this issue three or four times in one day with mulberry

 

[STIHLTECH]

How many years ago? "New to me" implies that it's secondhand. The model number has been around, what, 18-ish years? 'Course, it could also have an aftermarket bar.

Well, I know they have been gone at least 10 years, maybe more. Could it be an aftermarket bar? Sure.
Pictures! We need pictures !
My ESP is dimming with age.

 

[madpogue]

My ESP is dimming with age.

Mine too, along with my plain-old SP (without the E)......

 

[Alan]

Late to the conversation but this whole grease port debate is absolutely hilarious! It seems like with all the aftermarket bars, mulberry skirmishes, and fading ESP, we’ve all had our fair share of puzzling moments. We definitely need those pics to clear things up!

 

[Kelpie]

Grease gun adapter Here's I think what you're looking for.

 

[STIHLTECH]

Thinking about it, I would believe the Stihl bar on an 025 never had a grease hole. It has been that long.
PICTURE! SUSPENSE!

 

[Apex22]

Haha, I feel you! Let's get this photo up so we can wrap this up.