tail shaking at 75 MPH+ need some help!

[osm]

hello i have a xb12's 07 for about two years. last week i install new tires Metzler M5+ balancing the wheels. when i drive more then 70 MPH the bike start to shake aggressivly it's tail. i replace the whell bearings and lub the axel like the service book says. but still nothing has changed. these tail's shaking happend to me before and when i replace the bearings they simply gone for couple of mounth but still it came again and now i dont know what to do and why is this occurs. waiting for your answers ! thanks Ohad from ISRAEL.

 

[anrkizm95]

recheck the tire balance and check the tire for high spots/bubble

 

[xtremelow]

Fiancé's bike the shake and it was the tire pressure. Just another thing to check.

 

[Johny Kidd]

swingarm bearings?

 

[osm]

i rechecked it again and of course the tire pressure and bums on the tire.
though even if the wheel wouldn't be balance still it only would have vibrations and not tail shaking.
iv'e also checked the rim and it's runs good.

i'm thinking to put new set of koyo bearings and tourq tight it again. and maybe to puta steel spacer.

 

[squidbuellie]

[up][up][up][up][up]

swingarm bearings?

jack it up by the muffler while on the kickstand till the rear tire comes off the ground then grab the swingarm and shake it side to side and see you shake your tail feathers.

 

[osm]

anybody knows what's are the measurements of the swingarm bearings before i take the swingarm apart. thank's.gvf

 

[squidbuellie]

so are the swingarm bearings shot?
don't know the size but
http://www.americansportbike.com/shoponline/ccp0-prodshow/17671.html

 

[osm]

35$? nsk\FAG\NTN cost about -15$ for a pair from any bearing shop.

 

[Livers]

swingarm bearings?

Or rear motor mount?

 

[Midnight82]

Seriously, what's with all the terrible use of the English language today? I need a decoder ring to figure some of these posts out (on multiple threads, not just this one)

 

[squidbuellie]

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^kuck-kuck i knows you not talkin bout my truck boat truck.....