- Compression Test Can you lift the saw off the ground with the pull rope?
- Fuel Test Remove air filter and, spray premix into the carburetor and try to start. Use a 50:1 fuel mixture with premium fuel and Stihl oil
- Spark Test Remove spark plug clean with solvent & wire brush. Reconnect plug wire and let plug hang close to engine. Pull the starter rope and look for spark. Dim lighting makes it easier to see. If no spark replace plug and try again. Check off/on switch and wire coming from coil. If still no spark replace coil. (Older saws clean and adjust points first)
- If saw runs but, not on gas in tank, check gas tank for old gas. Empty old gas and, look for syrup in the bottom of the tank, if present clean thoroughly. Use carburetor cleaner, gas and a brush that can reach in and not melt. Try to start with fresh gas mix. If it doesn’t start check and replace fuel line and pick-up. If it still doesn’t start remove carburetor and check manifold boot (tube between carburetor and engine). Replace if needed and try to start. If it still doesn’t start remove carburetor,disassemble and clean thoroughly. You may have to soak in Simple-Green overnight. Try not to get solvent or carburetor cleaner on gaskets. Check gaskets. Diaphragm gasket should be smooth and puffy not wrinkled or wilted. If in doubt replace. Carburetor kits are around $8-$15 and include all gaskets, needle and spring. Reassemble (making sure all gaskets are positioned properly) and try to start. If it still doesn’t start replace carburetor.
This how-to works with a Husqvarna, Husky, Jonsered, Poulan, McCulloch, Craftsman, Homelite, Echo chainsaws as well as a Stihl 009, 009L,011, 011T,012, 017, 018, 018C, 019, 019T, 020, 020AV, 020T, 021, 023, 024, 025, 026, 026 PRO, 028, 029, 034, 036, 036 PRO, 036 QS II, 039, 044, 046M, 066M, 088M, MS170, MS180C, MS191T, MS192T, MS200, MS200T, MS210, MS250, MS260, MS260 PRO, MS270, MS280, MS290, MS310, MS360, MS360 PRO, MS360 QS II, MS361, MS390, MS440, MS460, MS660, MS880, HT100, HT101, HT70, HT75