We just got a brand new Volcano SV with a VX-18 engine. During the "breaking in process" we got to the point where we were running it at 1/4 throttle and half way through that tank of gas it stalled and we have not been able to get it started since. It is not firing at all, we recharged the glow plug charger to no avail. When cranking the engine over with the pull starter, i see bubbles with gas coming out between the cylinder head and the main body of the engine. Have we blown the cylinder head gasket? I have submitted a warranty inquiry and am waiting to hear back. Is that gasket easily replaced by novices? We are beginners. Thank you in advance for any help.