1986 Yamaha prov 150 carb question

Yamahadude

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Jun 22, 2020
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So on my 86 prov 150 I had developed a cold start issue, so I pulled it apart and my choke butterfly’s on the springs had snapped off. Luckily I got them out without any visible damage.

My question is I got a deal on a set of 6g405 carbs from an 89, my carbs are currently 6J900. Will the 6G405 carbs work on my prov ? Should I swap my internals from my current carbs. Or should I pull the 6G405 choke butterfly’s and put them in my 6J900. I recently rebuilt my 6J900 carbs so I could use that stuff in the new carbs I got if it would work. Carbs look identical to me but I’d like some insight on it!
 
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