Here is the procedure to remove the Clutch assy on a STIHL Chain Saw equiped with an Inboard Clutch. This means the clutch is under the sprocket drum and you have to remove the sprocket drum first. I will cover the outboard sprocket later in this thread. You will have to remove the clutch to do almost any oiler diagnosis or repair on a STIHL. This procedure is used on the following models. 017 MS170 018 MS180 021 MS210 023 MS230 024 MS240 (for the people outside the USA) 025 MS250 026 MS260 MS270 028 MS280 034 036 MS360 038 042 044 MS440 MS441 046 MS460 064 066 MS660 084 088 MS880 All you really need is your Bar Wrench.