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Hello all. New to forum and need help! I placed the oem pipes on my 79 Honda CM400a, and now the engine is really sluggish. I put new gaskets on, but I don't think I got them seated perfectly. Any assistance here will be greatly appreciated!
 

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What kind of pipes were on it before? The reason I ask is I'm wondering if the carbs were rejetted for the previous pipes and now this jetting is not correct for the new pipes. At what RPM does this happen? Was the bike running and performing good on the previous set of pipes?

If you think the gaskets are not seated then first thing will be to get that straightened away.
 

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When you replaced the mufflers did you by any chance remove the power chamber (under the engine)?

BTW welcome to the group.

Got pictures?~
 

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Welcome to the forum. Great to see another 400 series here. We need pics...old pipes and new pipes would be best.
 
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