hi everyone!

Hi, i introduce my self, mi name is Fernando, im from argentina!
I just bought a 96 sporstsman 400, engine just rebuilded with a wiseco kit, all crank shatf bearings new. I tooked from the shop and bringit to the beach 1000mi from home. Something happened after just an hour of drive it, the engine just stop, then really hard to start and i feel that somethings wrong with compression, i guess light will be the word. Did not overheat, and the fuel is mixed directly in the fuel tank. Where can i look first as the first less imaginable thing?

I hope you can help me.

thanks