Hipa Store
10-27-2022, 12:04 AM
Hi,
First post here.
MS 250 had for years now. Yard worker decided wasn't running smooth so adjusted carb. Then could never get it to accelerate, would die when trigger pulled. Calls to Stihl and setting it back to initial settings no help. Sat for 6 months and tried to work on it again. Cord will not pull through to try to start. What I read at the time said could be ignition or timing. Set timing gap to 0.3mm. Pulls freely with spark plug removed. No buildup or scoring on piston or walls. Can only pull cord maybe 2 inches the locks pull like hydrolock. Can pull real hard to get past stoppage, but only pulls 2 inches then stops like hydrolock again.
Bought new carb, ignitor, flywheel, muffler, and installed all. All fuel been drained maybe a month ago. Turned upside down with carb and muffler off and spark plug removed and pulled cord 6x to make sure no fuel or water or whatever in cylinder. Can turn flywheel easily by hand with plug out. Took muffler off again, installed and tightened plug and cannot pull cord past 2 inches of starter cord. Took cord assembly off and with plug tight can move flywheel counter clockwise through full rotations by hand. Can feel compression build and can move past by hand. Put cord assembly on and locks up every 2 inches of rope pull. Makes no sense to me. Cord pulls freely when not attached to saw.
Anyone know what is happening and how to fix it. Stihl corp tech support no help. Local dealers won't even answer a question if it's about mechanics or running.
First post here.
MS 250 had for years now. Yard worker decided wasn't running smooth so adjusted carb. Then could never get it to accelerate, would die when trigger pulled. Calls to Stihl and setting it back to initial settings no help. Sat for 6 months and tried to work on it again. Cord will not pull through to try to start. What I read at the time said could be ignition or timing. Set timing gap to 0.3mm. Pulls freely with spark plug removed. No buildup or scoring on piston or walls. Can only pull cord maybe 2 inches the locks pull like hydrolock. Can pull real hard to get past stoppage, but only pulls 2 inches then stops like hydrolock again.
Bought new carb, ignitor, flywheel, muffler, and installed all. All fuel been drained maybe a month ago. Turned upside down with carb and muffler off and spark plug removed and pulled cord 6x to make sure no fuel or water or whatever in cylinder. Can turn flywheel easily by hand with plug out. Took muffler off again, installed and tightened plug and cannot pull cord past 2 inches of starter cord. Took cord assembly off and with plug tight can move flywheel counter clockwise through full rotations by hand. Can feel compression build and can move past by hand. Put cord assembly on and locks up every 2 inches of rope pull. Makes no sense to me. Cord pulls freely when not attached to saw.
Anyone know what is happening and how to fix it. Stihl corp tech support no help. Local dealers won't even answer a question if it's about mechanics or running.