Can you give us the make and model? If it is old enough to not have limiter caps gently seat the H and L screws then back them out 1-1/8 turns. Start the saw and rev it out briefly. Adjust the H screw in and repeat until you hear a slight hunt. Adjust the L until it idles at a lope and picks up cleanly. Turn the larger speed screw until the chain stops moving. The newer saws with caps don't offer much leeway. Turn the H screw anti clockwise as far as it will go.
If it is an older saw with points and condenser I supect your condenser is going bad. Classic symptom of a bad condenser is engine quiting after a few minutes run time. Could also be a bad spark plug or wrong heat range spark plug. Welcome to PEF. Roger
It has new Champion Cj6. Its Lombard Comango. I also noticed the saw will surge when squeezing trigger meaning speeds up and down then all sudden speeds up really high then slows really down then its back to normal before cutting off. This all in a few minutes of run time.
A forum community dedicated to power equipment owners and enthusiasts. Come join the discussion about brands, maintenance, reviews, troubleshooting, repairs, accessories, classifieds, and more! Open to all tools from Air Compressors, generators, log splitters, pressure washers, sump pumps, water pumps and weedeaters.