hi, is there any chance that mvvs has adopted their newest engines for the us marked. I hear rumors that they have altered the compression ratio on the newest engines. my new 49 runs really weak on fuel with out nitro, but once it gets about 7% nitro it runs much stronger. I`m thinking to try even more nitro to see if it likes that. I`ve been reading all about how well they run on low or no no nitro at all, but as mentioned mine has no power on 0% nitro. what gives???