I rushed into the motorized bike world. I know NOTHING about them. I tried putting together a 80cc engine purchased from amazon on my Roadmaster Granite peak. The carb. threw my engine out of alinement and the tensionor keeps sliding. On top of this..when I went to test the bike...when I released the clutch..the back tire just....skids. Which I assume is because of the problems listed above. Furthermore my throttle pin...the thing I'm suppose to drill a hole for in the handle bars...was plastic ...so it's no loner whole...it's grinded down..so..super glue here I come? I purchased a spring tension that attaches to the cover of the chain spin. ( the clutch pin pull ) But I won't be using the bike due to the carb throwing the engine off balance. So I'm buying either a Cranbrook or a Nel Lusso. Which one should I buy?