ENGINE NOISE, I'M STUMPED Please Help

[Toddxs650]

Hello All, new to this forum.My question is i recently finished my 1980 rigid xs650 and when i'm riding around 30-60 mph and lower the throttle a touch there's a noise that rattles in the engine."I THINK " no luck finding it ive checked all bolts/nuts even timing chain tension about a 1mm of play,mufflers not rubbing against frame,Maybe muffler inside the heat shield?. no loss of power at all,starts on first kick,chains has good tension.new Rotela oil.oil level correct, it just sounds like somthings loose inside the head/motor valve spring? but i think it would'nt even start with a broken valve spring..I'm stumped it just does it when i reduce throttle speed,for a few seconds. But when i accelerate it goes away. Or is this the way it's supposed to sound? I just don't want to get stranded. Please help, Thanks Todd

[drooling-bloodhound]

Is the cam chain tightened correctly?

[Toddxs650]

Thanks for the reply, is the timing chain The same as the cam chain? If yes it's adjusted correctly.

[drooling-bloodhound]

Whoops that is what I meant cam chain. It is hard to tell without seeing and hearing it. Are you sure it is not the valve. They should be adjusted cold.

[Toddxs650]

I'll check valves again, but if valves were wrong would the bike not run right due to valves to loose /tight.? And the noise be constant?.The noise is there when I ease off throttle, over say 40 MPH. Thanks

[drooling-bloodhound]

Those were just basics it is hard to tell without hearing or seeing the bike. Seems like you know what you are doing and will figure it out soon.

[Toddxs650]

Thanks,i'll post when i adjust the valves again. Please check out my bike on youtube, let me know what you think. http://youtu.be/3QvgB295pT0 Thanks Todd

[Toddxs650]

wow, adjusted valves again + rechecked and no noise any more. Thanks Bloodhound for the help