rattly/noisy top end

lately my bike has gotten louder (70 hours), sounds like from the top end. i am thinking a few things:

1: cam chain; so going to check the tensioner is ok
2: valves; i'll have a look in but the valves were in spec 10 hours ago
3: auto decompressor on the cam shaft

I am pretty sure from looking before that the first 2 are ok but i have noticed before that the lobe or cam for doing this is sort of loose, maybe a milimeter or two of play laterally on the shaft.

anyhow is this typical? or should i put some kind of spacer in there to tighten the clearance up. i do remember my previous te being a bit more noisy this way than the ktms or yams my friends ride but this seems louder.

anyhow sugestions/info appreciated

What kind of a sound are you talking about....

pop the top cover and check for anything loose , focus on the oil seperator centrifuge disc, they are known to loosen on the end of the cam shaft and come apart,,,mine came loose and made the center mount hole out of round and rattled around, this is not the greatest choice but I run without it, per the team boss of the AMA supermoto team GP motos crew.

what does the disc actually do?

a sort of rattle, its kind of a valve tappety noise if that makes sense

I just replaced the valves guides on a 06 TC250 that was very noisy in the top end.

The centrifuge disc is functionally a cyclonic breather that is in place to prevent a straight shot of oil from exiting the motor.
That disc sits in front of the crankcase vent outlet, most oil vapor or splashed oil would hit that disc before it went straight out the vent outlet and would be cast off the disc and just flow back into the head area in the form of liquid oil. So that said I run without it, but really have been contemplating installing another. The SM team has had them completely come apart (lots of very hi rpm running) that is why PL said it was fine to remove, I must say that on some goofy tip overs I think having the disc in would keep at least some of the amount of oil that gets into my intake from the breather tube and prevent at least some oil migration through the vent tube during hard running (thats what is engineered to do).
R

aha ok that makes sense i shall take it out and run it see does it make a difference.
then ill see if the valve guides are worn but i doubt they are so soon ..

cyclonic breather i am glad you explained that because that term wasnt gonna help me understand at all

Don't misunderstand me,,,,,if it is solid on the end of the cam for sure leave it in place as intended by engine designers/engineers.

mine was rattling around on the end of the cam with center mount hole completly out of round and loose, just ready to completly come apart, that is why we removed it.
If it is working correctly and solid I would leave it alone and just monitor it when you pop the top.
Note for ref its Item12 of table7 pg41 of the 08 Husky parts manual

i had a noise in the head ended up being a cam bearings pressed the camgears off replaced the bearings which were $5.20(aus) each problem solved for 20 dollars and replaced them all