Don't know the stock sprocket sizes for the 08+. But if you want better acceleration change your rear sprocket. I believe adding teeth to the rear gives you more acceleration, however it will also give you higher rpm's.
Personally, I like the acceleration on the 250. I've thought about getting a 15 tooth sprocket on my '07 ex250 which will lower my rpm's and make the bikes less screamy on the highway going 60-70mph. It's easier and cheaper than the rear sprockets.
Last edited by tadster00; 04-10-2012 at 10:50 PM.