Atvspeeddemond 10 Posted January 1, 2013 I have a scrambler 400 and the antifreeze was going through after one ride and then after awhile I smelt the antifreeze burning in the exhaust. So then I changed the gasket on the piston head.it hasn't fixed the problem. Now the spark plug get ruined after 3 times of starting the atv. But there is no coolant in the plug. Any suggestions Share this post Link to post Share on other sites Like what you are reading? Please help us by sharing this content.