I have a 07 700 griz. It ran fine but had a blown head gasket. So I finally got off my butt to fix it and bought a big bore HC 11-1 piston kit off ebay. After install it started up fine and ran just like it should but it dies after 30 seconds of running/idling. Then fires right up and dies again again. Any ideas on what I should be looking for to fix this?