Question about RTO Spur Sprocket For Stihl 017, 021 Chainsaws
I want to run a 3/8 pitch 0n my 028 do i need to change the sprocket
The following is copied from the Oregon FAQ "What is pitch".
Chain pitch is the distance between any three consecutive rivets divided by two. Pitch defines the size of the chain. OREGON® chain is made in several pitches - 1/4" is the smallest, 3/8" is the most popular. Other parts of the cutting elements are pitch-related. The drive sprocket must be the same pitch as the chain, and so must the nose sprocket in sprocket-nose bars.
An illustration and the original question is here: http://www.oregonchain.com/pro/service/faq.htm
If the result from an existing chain is 3/8"s or 0.375" then you need not replace the sprocket. If the result is different then the drive sprocket and bar nose if sprocketed must be changed. Chain gauge must also match to prevent problems.
If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
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Posted on Jun 03, 2010
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Posted on Jan 02, 2017
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