Just wondering if anyone would know what a knock in the engine would be when you first start the bike. First start the bike and noise there, (sounds like an exaust leak , ratttle , knock). After running at idle for a few minutes nosie comes and goes, then it completly goes. Wont come back again till the bike is shut of for a long period of time and let cool. Also i find the engine a little tickie when running but i hear that normal for them engines. This engine dont sound anything like my 450 honda foreman. Anybody with any idaes would be a big help.