Having gotten away with doing nothing for ten years other than tweak the mix a bit it's time to go through the carbs, so wish me luck - I bought a repair kit but have a question - each carb has a choke and secondary throttle membrane, yet the kits all appear to only come with one replacement. Is there a reason for that? I opened mine and can get away with only replacing one (only one of each is cracked) but would prefer to replace all as the others are pretty stiff. I did email the supplier but not sure they are understanding what I am asking. I do see I can get just those parts on ebay if needed, but just curious.