Are you having loss of acceleration or top speed? Have you checked on your Roller Weights and if they have flat spots? If they need to be replaced look no further than the NCY Roller Weights for your Honda Navi, PCX 150, ADV150 or Polaris RZR200. These roller weights hold their own very well and are great for high-end engines. Roller weights are a very important part that is important for getting the most out of your build. The NCY roller weights’ inner ring is knurled carefully and then bonded with plastic, this saves the weight material from separating from the inner ring under temperature stress. These Roller Weights contain high PTFE content in the outer material which provide good self lubrication and durability.