Repair & Maintenance trx350d smoking? June 22, 2015 I have a 87 350 foreman that I put rings in last year. Since then it doesnt smoke except when you gear down or going down hill without giving it gas. Just riding or accellerating it doesnt smoke. Any ideas what the problem could be? Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related