Is this a good choice for a carb for my bike? Mikuni VM 34-168 It appears to be the same as what came with the bike but I'm not sure.
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There is debate, Mikuni will give you easy start and reliability but lack some of the top end vs dual carbs. Search the forum and you can get lost in Mikuni-Amal threads.
My bike came with an ancient Mikuni, I use it and it works well if not a bit rich. I have tried all sorts of jetting, slide combos and consider mine a work in progress. For now it gets me down the road fine.
If it's what you've got, mount it up and see if you like it, if you don't, try the Amals. Now you have 3 carbs to yell at.