139QMB GY6 Big Block

[ScooterDan]

I live in Dominica ( not Dominican Republic) for the next year and a half. Anyways, it's all mountains and steep hills here. For this reason i'm considering upgrading to a big block. The kid part of me is saying go for the 100cc big block kit because it will provide a bit more speed and fun. However the adult side is thinking whether a 100cc BBK would prove to be reliable enough. Help me out here and let me know what the reliability issues are with going with a 100cc big block vs a 80cc big block. With either kit, i'm going to get the head along with it.

Thanks guys!