Front End Chatter '81 GS850GL

[Mike Curtis]

Out riding yesterday while exiting the freeway I applied some front brake got some front end chatter nothing very serious but annoying. Is this coming from front fork bearings or is this normal with the double front discs.
I'm rather new with motorcycle mechanics and need some info. I have already check the front forks for loseness in the front end and seems good.
My exit speed was around 50 to 55 mph and this was the first time I experienced this. What should I look for?

[Dink]

Front tyre condition!!! is it hardened at all, balanced, feathered on the tread; feathered is where the tread block is worn one side of the block compared to the other. Tyre pressure, fork oil changed? sag measurement?; sag is the difference between the "free" length of the fork and the loaded length, free length being the gap between the bottom of the triple trees and the black rubber cap over the fork seal, with the front off the ground hanging "free" minus the measurement with you on the bike in all your gear in your normal seated position.

Dink

[Mike Curtis]

Front tire is new mounted by PO, the rotors look good I should check the run out to make sure they are not warped., I was thinking the bike has 25,000 miles on it is it time to replace the fork bearing or what kind of life do I expect out of them.
I will check the dimension that you suggested.
Thanks

[Pharkmeh]

for the safety of others I try not to post in the tech threads...8-[

but I have a m8 who rides his Bro's 04' ZZR and complains his Bro has the front suspension dialed in way way too hard causing a similar front end chatter to what you describe...

since I hear a few blokes accidentally pump way too much air into their front forks on the old bikes i thought it worth a mention...:shock:

g'luck with that

cheers

Phark

[Mike Curtis]

Thanks m8 I'm within specs with the front fork air with charts provided in my service manual and rear spring settings.