It seems you have the same as me, it is a gy6 1P57 but it seems to be another variation. the head is a " power" head which should mean ( according to many people) that they are taller and u can't put cams on it, not true as i installed a A12 cam no problem, it has bigger valves the regular gy6 heads and ports flow a bit better. The cam that comes in it is also not bad already ( probably why they rate these at 10hp) I measured the intake lobe and came up to 26.3mm and the A12 at 27.0mm so lift barely goes up a little more then half a mil.... You should contact a hammerhead distributer so they can point you to where to get stuff for these, there are quite a bit of differences on them like the crank etc.... I heard u can't stroke these either... Sucks in some ways but nit bad in others. I will be building another regular gy6 with all the best stuff, whent this one goes i will swap it out.... Good luck
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