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I'm working on a toro with a kohler courage 20hp that has a blown head gasket on the left side cylinder. Should i replace both head gaskets since I will already have everything out of the way or should I just replace the one that is blown? I see a small amount of caking around the good head...

I'm working on a troy-bilt tractor with a kohler courage 18 (model # SV540S). The owner said it was hard to start and did some messing with lord only knows what. Long story short, I got it and rebuilt the carb, cleaned it up and it starts but the throttle controls wont work right. most of the...