I bought this motor used and it seemed to maybe have not been very well taken care of.. I changed plugs, oil, filter and everything seems to be good other than a slight bogg if I give it to much gas at low speed .. But I noticed a ticking that gets louder with the rpms.. It's not really loud And not causing any problems I'm just wondering if this could turn into a big problem.. It sounds the same even if I run full speed for a half an hour never loudr or softer any ideas? Thanks