^^ Yea, what he said. Don't ever hold the clutch when the engine is engaged. You will flatten the plate bearing quicker than you can say "Oh Faaawwwwwk."
It seems many people remark about issues with the starter clutch and the v1 kits. I think it's just has something to do with the amount of compression associated with the kit, almost like the clutch slips because of how much compression the cylinder is generating, or something.