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? CB400 frame - 750 engine?

ef5tornadorider

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I bought this chopper project today. No title. The frame says CB400A, the engine is a 750 according to the guy I bought it from. Can anyone tell by looking if it is a 750? I'm new to the 750 scene. Can a 750 fit in a 400 frame safely. Will the frame be sturdy enough? Any help is greatly appreciated.
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Wow, lot to take in there.That frame looks like after market hardtail that someone stamped with old title or motor numbers. The motor could be a cb400f. the 350 and 400 fours look alike. Find the cb #s on the motor cases and get back.Good luck with it.
 
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