So you guys might not notice it with your bigger bikes but my engine is only 150cc and I feel like it's not as powerful as it used to be back in the spring. It takes longer to accelerate and it struggles more uphill. I used to be able to go 45-55 uphill and now it will like slow down to about 30 and struggle. I also take off from a stop slower. What kind of things cause this too happen and what things should I check? Could it be the battery problem I am having and currently working on?