I have been out of the atv world for a few years now and I am looking to get back into it. I'm thinkin of a 2015 400ex. If I remembe correctly, the old 400 ex models had oil starvation issues during wheelie because of the oil pump placement. Has this been amended in the new models? I had a z400 but this time around I'm tryin to buy on a tighter budget.. Its 1000 or so less than a New z... so this quad seems like the best buy for the buck....