Just want to say my brother and i have a GX 200 super limited mod from NR racing has a dyno sheet showing 18.6 HP . This motor is on a custom built minibike and is totally bad asss . It pulls like crazy right up to the high 8k's . Russell is the man for hondas . I have a built honda 160 on a rupp with parts from NR racing , everything but the cam and its a black mamba . But NR racing is top notch and the best honda / engine builder .