Good evening hopefully someone can help. I have a 670 that I have had for a long time and it's been great lived it's whole life in tree removal. Climbing, limbing and slashing. Needs a rebuild now getting a little tired. Going to do some porting and open the muffler up a tad but can't seem to find the info on a bigger carb. Anyone know of the model I need that will bolt on? Was thinking of just opening the bore of the original carb but not sure if that will be enough
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