No. Ask Dr Dingo's info correct for areas other than the US, but was a bit misleading for US pilots since every other country requires a special night flight add on to a private certificate, while in the US a private pilot can fly at night without special training. Nothing prohibits you from flying an IFR cert a/c. Actually its great to have the extra instruments on board. I'm sure you know how to use an ADF or VOR, but if the aircraft in question has a GPS, LORAN or DME equipped (to a much lesser extent), make sure you know how to use it properly before relying on it for navigation though. Granted it is a slim chance that not knowing DME slant distance or how a LORAN functions will cause a serious issue, but its always best to err on the sider of caution when flying. Also don't think that just because an aircraft is IFR equipped, it means flying through scud is no big deal without an IFR rating because of the fancy instrumentation. A non IRF pilot in the soup has about a 2 minute life span unless they execute a standard rate 180 regardless of the fancy gadgets onboard. Most poeple know better than that, but people still take off in C-337's with one engine non functional, so you never know.