I’m new here to Yamaha but have been around engines some for years. I just picked up a Yamaha Grizzly that’s been sitting for a few months. Sellers story seemed legit so I took a chance on buying a non-running atv with 400 hours and in great shape. Checked compression while I had the carb off to replace it and it’s at 120 PSI which I’ve read is slightly low for these and should be about 160psi. Could the decompression cam be causing the slightly low numbers or did I probably end up with a lemon?