Can anyone give me a reason why I cant use a rectifier off a Fazer 600 on my RVF400 as an upgrade? They both look the same and a mate of mine says it will do the same job. Any help with this and a reason why it wont work would be appreciated. Paul

Could you post some pics of the fazer rec and connector as i am not sure what they look like?
Cheers

It will work fine if it uses the same 5 pin connection as the R6 regs.