If you go with a slide carb I would strongly suggest Mikuni VM606 series. No clue as to what you will need to tune to your engine. Even if you buy one that fits another 150cc engine different from the GY6 you will have to tune it. A good example is I had a customer with a polaris 250 atv who needed a new carb. The replacement Mikuni for that application cost almost $400.00 so I went with the same size Mikuni unerversal. I had to change out the jets, jet needle, needle jet and needle and seat. They are a totally different critter than a cv carb. Unless you have major internal engine mods the stock cv works great properly tuned. I know of several people who have used the Mikuni VM-606 26mm carb with success but they also bought with the carb the jet kits. However they all had heavy nods done to their motors.
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