I have a 90cc Polaris scrambler that I bought for my daughter a few years ago. It ran great. I put it away last fall for the winter( I did drain the gas and ran some marine fuel through it so it's not a old has issue at all). But It now seems I have no spark. Is the cdi box likely to go bad from sitting? If there a way to bypass it to test it. Bc a new cdi box is a few hundred bucks. Any ideas? Thanks.