The Jetmoto 150 is still under construction....trying to get some extra parts Ive gotten over the years to run.. I rebuilt a extra GY6 engine I had with a 4mm over bore piston and cylinder..along with a 3mm stroker crank... Ive had to remove a bit of material from the cases just to make it all fit and clear...Latest on going problem is way too much compression. I have been removing material from the head and piston in a attempt to lower the compression..Next time I get some free time Ill work on it some more.