thread was deleted and moved to four stroke forum Oct 6, 2018 8:39:24 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by tortoise2 on Oct 6, 2018 8:39:24 GMT -5 Oct 5, 2018 23:33:43 GMT -5 gy6me said:could be a fuel starvation issueWhy did you post a 139QMB 4-stroke engine issue in 2 Stroke Troubleshooting?Have you tried running with a loose gas cap?No mention of checking valve clearance?