Rebuilding the Stihl 391 for better HP gains opened primary lower transfer. Cleanup the exhaust port for better flow. They Hyway cylinder and Dukes coated piston are in excellent shape no scratches after 26 tanks of gas. It looks like the cylinder still needs to break in a little more they maybe better than OEM. I used a Hyway piston pin bearing because the factory one swell up and got tight seems like sometimes they do. First cylinder torque pass is 4nm or 35 inlbs. Second cylinder torque pass 12nm or 106 inlbs.
Негізгі бет Stihl ms 391 Chainsaw Engine Rebuild with bolt torque values.
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