breahn riley
XS650 Addict
So after finishing the engine rebuild and firing up the motor I am noticing a knocking sound around 2500-3000 rpms. Ill first start with what I did to the motor. Pulled the head and installed new gaskets. Pulled the valves and cleaned them up. New valve seals and a minor porting of the head, pretty much just tried to clean up the casting. I am fairly certain that I have the cam in correct postion, but am wondering if I could be a tooth off? I got pretty good compression, high 140's. I've also installed a pamco system. This is where I'm also a little worried. My bike is an 81 so it no longer has two F on the stator. It has two lines torwards the front and then a third line. At idle I am setting the timing between the two marks torwards the front. But when it revs it advances way past the marks. I've uninstalled and reinstalled the atu just to make sure I did everything correctly. My question is from idle to redline will the timing always be between those marks? And if my timing is off that much will it cause knocking? I'm definitly noticing the knockin more when I'm riding. I've reduced the gearing to 17-31. I've heard XSJohn mention that you need to retard your timing when you're running bigger gears. I'm just looking for some info and suggestions before I pull the motor and double check all my work. I think everything is back together correctly so I'm leaning more torwards the timing. I've also tried timing on both plug leads and my gun preforms the same on both. I am really looking forward to hearing back cause I'm dying to ride my bike. Thanks