The Forestry Forum

I know this has been beat to death but here goes!
This spring my MS250 would not pull over past 1/2 turn.
Both hands, foot in the stirrup and no go.
So, I pulled the recoil off and had a look at the coil gap.
The center pole was at .012" which seemed right.
The other one looked tight, maybe .004" ant best.
Set both to .012" with a credit card.
Now it pulls easy and starts fine.
I have no idea why, I saw no sign of interference.
The only thing I can think of is spark advance from tight coil gap.

Flooded? Crankcase Locked up with fuel?

Quote from: Sprinter on May 01, 2025, 02:48:34 PMI know this has been beat to death but here goes!
This spring my MS250 would not pull over past 1/2 turn.
Both hands, foot in the stirrup and no go.
So, I pulled the recoil off and had a look at the coil gap.
The center pole was at .012" which seemed right.
The other one looked tight, maybe .004" ant best.
Set both to .012" with a credit card.
Now it pulls easy and starts fine.
I have no idea why, I saw no sign of interference.
The only thing I can think of is spark advance from tight coil gap.

Me thinks a bit of over analysis is desired. Flywheel interferes with a coil, u set the air gap and now it doesn't :) Happens all the time.... old eye's not seeing the details. And if the 250 is like the later 660 where the coil is, sometimes you have to crush kill switch wire to get it to settle, and if that is the case running for a while will have it settle more and create a possible interference  at an unexpected time.

I posted this as added info for all those others with the same problem.
Besides the tight coil gap, I wonder if this coiled be related to the recoil? 
For some reason Stihl made the pully with 2 pawls in mind but only put in one. 
Could this cause a weird torqing of the flywheel on starting? 
All said and done, it works well now so, I'll will leave it be.
Besides, it's got some wood to get.

Yes the starter drum can run excentric which will bind them up .