TOPIC:

My friends bike and mine are the same and he has his carbs apart. The bike is a 1977 kz900, does that make his carbs those smooth bore carbs? They are the stock carbs from what we can tell.

smooth bores are aftermarket carbs,most commonly 29mms.his carbs are probably 26s.got a picture?

No picture yet, bike is at his house. Any idea where i can look at a picture of carbs to see what he has?

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So if they ar5e smooth bores they will look like that?

measure the size of the opening on the engine size of the carbs if its 29 they might be smoothbores if its 26 then theyre stock

those look like 26's as I think I see a gas line going between #3&4 carbs,29's have one gas line feeding all four as does the 28's on later bikes.

FWIW the '76 900 26's were the most trouble free and easiest to tune of any of the stock carbs IMHO.

77-78 were the most trouble, with their fuel needle pilot system, instead of air like the rest.

The stock carbs on a '76 KZ900 are Mikuni 26mm.
Here's a pic: