All 390s prior to the about 2011 will turn the rpms you want (with gov, removed). If its a "newer" 390(UT2), then it comes with the cdi coil and flywheel that limits rpm. To "get around" this you can put an old style flywheel and coil on the UT2 engine OR buy the special coil from NR Racing that will work with the newer style flywheel that is NOT rev limiting. About 90 bucks I think. Keep in mind this is talking about actual Honda stuff. Clone 390 and 420 engines are still the "old style" that will allow the rpms after governor is removed. Good luck.You must be able to get a model without the rev limiter, because i've seen 2-3 people running these, and they sure has hell are not under 6000rpm, but they have so much more speed than everyone else!