NEED HELP!!! on carb issue!!

hi guys, i have a wr400f with a FCR1 carb on so i bought an FCR2 carb to up grade it. BUT i bought the carb without knowing the difference btw honda and yamaha thinking both are the same 39mm. now i have a 40mm carb from a crf450 so i need help in suggestion whether can i still make it work on my bike.and will it cost my bike any performance lost? now i'm so troubled by it... :thumbsup:

bike bike current have the hot cam auto decomp but the engine is stock.

thanks in advance. :thumbsup:

It might go better!

The CRF250F's got a 41mm carby!

I wouldn't be worring about it at all.

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