An assembled 42.5mm short block for the Stihl 025 and MS250 chainsaws. It also fits the 021, 023, MS210 and MS230, which are 40mm saws from the factory; because it brings its own cylinder and engine pan, it installs as a complete 42.5mm engine. It contains a new cylinder, piston with rings, wrist pin and clips, wrist pin bearing, crankshaft with bearings and seals, and the engine pan. The flywheel, ignition coil, clutch, carburetor, starter, oil pump and covers transfer from the old saw. To install, remove the pan, apply crankcase sealer, set the short block into the engine housing and torque the pan bolts, then set the carburetor tune.
- ASSEMBLED 42.5MM SHORT BLOCK - New cylinder, piston with rings, wrist pin and clips, wrist pin bearing, crankshaft with bearings and seals, and the engine pan.
- FITS STIHL 025 AND MS250 - The 42.5mm saws.
- ALSO FITS THE 021, 023, MS210 AND MS230 - Those are 40mm saws from the factory. This short block brings its own cylinder and pan, so it goes in as a complete 42.5mm engine.
- WHAT YOU MOVE ACROSS - Flywheel, ignition coil, clutch, carburetor, starter, oil pump and covers come off the old saw and go onto the new engine.
- INSTALLATION - Remove the pan, apply crankcase sealer, set the short block into the engine housing and torque the pan bolts. Set the carburetor tune before working the saw hard.