The Stihl 034 AV is a reliable saw that has done satisfactory work on trees up to 20 or 25 metres tall with a considerable diameter. Never had any problems with it.
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The difference is in the motor size.The 034AV is 56.5cc (cubic centimeters) and the 034 Super is 61.5 cc (cubic centimeters). The 034 Super has a slightly larger motor, and therefore it presumably also has greater speed and power.
It stands for Anti-Vibration. I have two Stihl saws made in the 80's (an 015AV and an 034AVSuper). The 034 replaced a really old 041 without the AV, so I can attest that it really makes using the saws a lot more comfortable if you plan on using it for more than an hour or so at once. But then again, all the new Stihl saws have the AV now :o)
Anti Vibe
The 1985 Stihl 024 AV is 44.6 cc.
49cc
045 av is 75cc and the 045 av Super is 87cc.
51.4cc
gap is .017
77 cc
41.6 cc
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