,Look on your gypsy and you will see a number such as 003 then go to Lewmars web site and look at chart to see what chain size you need. Example I had a 002 and called for 5/16 chain, I had it changed then my chain kept jumping off ,looked at new gypsy and it was a 003 ,which called for 3/8 chain, changed that and it works great, good luck, I looked at you picture and saw it's 000
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