hi everyone last year for my 14th birthday I got my first bike it was a chinese brand that was pretty cheap my dad wasnt sure if I was serious about getting into riding so he didnt want to spend much money Its a 125 4stroke with a seat height of 32.8 inches and a dry weight of 231 lbs so with not much power it is very hard to jump with. my birthday is coming around and I want to get a mx bike and start racing I'm fairly comfortable on a 2 stroke 125 but i like the idea of the smaller 85 plus if I get an 85 I can get a brand new one.what age level are the 85's aimed at I dont have much experience on any race bike but i did have a 20 min test ride on a yz250f just on flat ground and I only went up into 3rd gear. I'm 5"4 - 5"5ish and weigh about 69-70 kg (around 150 lbs) would it be worth getting a 85 or am i too tall or heavy or outgrow it too quickly i would want to keep it for 2-3 years so what do you all think I dont have much experience only a year of riding on a mellow very heavy 125 4stroke should i go strait to the full size bike or go with a 85.sorry for such a long post thanks in advance any advice is much appreciated.