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hi there people, im currently building a cafe racer special based on an old y-reg c90 (!) and im 80% complete but i feel more power is needed to achieve my target (a drunken bet to try and get a ton out of a c90 - dont ask!!). ive got my eye on a 140cc lifan engine, am i right in thinking they are a straight swap (apart from the clutch of course). i had a trawl through some old posts but couldnt find too much info. thanking you in advance for any help, i will post a couple of pics soon if anyone fancies a laugh! - jon