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Discussion Starter #1
I have an older McCulloch Pro Mac 650 chainsaw (2-stroke) but no owner's manual, and I need to replace the spark plug. Is .025" the correct gap? Thanks!

Brad
 

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Discussion Starter #3
Thanks, Jim...just what I was looking for and then some!

I did some digging around on the web this morning and I discovered that the 16:1 fuel mix I've been using is way off and 32:1 would be much better. No wonder the plug tip is so fouled!:fing20:

Brad
 

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.025 is the correct gap, also your saw uses 40:1 fuel. 32:1 should work just fine though.
 
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