2011? 250 recon es in otherwise very good condition. Fixing it for a friend. Extremely hard to pull start. Rips-your-arm-off hard. Electric starter can't do it either. The carb was trashed internally from gas sitting in it so it won't run for more than a few seconds but it will run. But wow this thing pulls hard. Get it past the compression stroke and you can pull it ok. As far as I know it has never been apart so the timing is unlikely to be off. I've looked at the service manual and this thing does not appear or mention having a centrifugal compression release for starting. Am I correct? Have any of you seen carbon buildup so bad that it causes this problem?