oil leak

[Andrew11]

I just got my quad back and it looks to be leaking oil out of the head gasket, theres oil around the left side of the head cover. It's a 2000 honda 400ex that i just had bored out to a 426 and put a hot cam stage 1 and 10:1 JE piston in. The cam chain tensioner appeared to be leaking oil a little bit and now the head is leaking. I havent tore into it yet but im hoping maybe the shop just didnt torque things properly or the gaskets are ****ty. The gasket kit is a Namura... Any thoughts/opinions from anyone?? thanks

[Andrew11]

The quad sat all afternoon after i got done riding it and had noticed the leak and when i went to put it away tonight it ran like **** and would barely idle and die if i tried letting out the clutch. Somethings gotta be effed up for sure...