1. 开车 and 骑车 and 停车 are examples of verb-noun pairs. Nouns by themselves are usually described with multiple syllables such as 车子 and 摩托车.
2. 加油 has the literal meaning of refueling, but is also commonly used in encouragement to mean “Keep at it!”
3. The sentence 对摩托车的问题比较没那么大 has a different sentence structure than we might see in English. The literal meaning here is “For motorcycles’ problem, more not so big.”
4. The 起来 in 所以摩托车跟车子比较起来 signifies the beginning of the “comparing” action.
5. Note the usage of 给 in 因为找地方给摩托车停也比较方便.