Won't keep running
I have had this KM55R now for 7 years. Total number of hours of use is probably about 80hrs. In the past I have had many Stihl products and still have a chain saw that is now about 30 years old and still works fine. The KM55R does not compare well. I have used high test gasoline and Stihl 2 stroke oil and have already had to replace the carburetor once. The unit again is not functioning, ran very poorly for about 15 minutes, cut out and won't re-start! I have used it with hedge trimmer and also have the pole saw. It has not been subjected to dirt, dust or miss-use. I am very disappointed with this product!
Powerful and reliable
After 4 years without being used, I dug the Stihl trimmer out of the shed today to give it a start in preparation for some gardening at my folks place this weekend. I mixed a fresh batch of 2 stroke fuel, filled up the tank, pressed the primer bulb a few times, and pulled the starter and it sprung to life just like the day i bought it. These units are quality.
I only have the straight shaft line trimmer attachment, so I can't comment on the other attachments, but as a trimmer it is more than capable. It has a ton of power, and loves to rev, ...if you are lazy on the throttle and light on the muscle it will run away from you and start carving trenches in the dirt. If you are doing fine trimming you need to keep the rev's low, but if you have heavy overgrown bush, just pull the trigger and let it loose, it is a monster.
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