Ever since I got my quad back it seems to struggle to start. It almost seems like a weak battery. I checked the battery and it has about 12.5 volts, and when it is running it seems to be charging at 14 volts. The only thing different is the 10.5:1 piston and stage II CAM install. It barely turns over at full choke, and won't start at half choke, and hesitates to start at no choke. I did put 10w-40 in it, I usually run 10w-30. I haven't checked the starter yet.