Slow weave has me stumped

[Drew]

Christ almighty people, start simple, and work up from there. I'll put $20 on it being steering head bearings a touch too tight, lots too sloppy, or just a fraction buggered.

Mr Frost, take your hands off the bars at 50kph and see what happens. It'll either try and ride off the road, or start a gentle shake turning into a violent one the longer you leave said hands off.

[FROSTY:Me]

Drew --Nope mate -did that on the test ride--Took it to the servo put air in tyres--yea i know not accurate but I was 250k from home.
Then off for a ride.
Put bike in neatral at 100km/h sat upright -gentle weave slowwing to around 40km/h-still a gentle weave
Very light pressure on brakes -No pulsing
Back to the guy selling it-Haul her over onto her sidestand and had his son balance it on back wheel/sidestand.--again 250 from home--ya do what ya gotta do.
grab the wheel -no bearing clunk--spin it--all good-
Check wheel runout with ye ol screwdriver on the forkleg-no visible runout.
Turn steering left to right -smooth with a tiny bit of resistance-
Grab wheel--tryn haul it back n forwards --nope tight as.
HMMMM

[enigma51]

Drew --Nope mate -did that on the test ride--Took it to the servo put air in tyres--yea i know not accurate but I was 250k from home.
Then off for a ride.
Put bike in neatral at 100km/h sat upright -gentle weave slowwing to around 40km/h-still a gentle weave
Very light pressure on brakes -No pulsing
Back to the guy selling it-Haul her over onto her sidestand and had his son balance it on back wheel/sidestand.--again 250 from home--ya do what ya gotta do.
grab the wheel -no bearing clunk--spin it--all good-
Check wheel runout with ye ol screwdriver on the forkleg-no visible runout.
Turn steering left to right -smooth with a tiny bit of resistance-
Grab wheel--tryn haul it back n forwards --nope tight as.
HMMMM

I reckon its the dunlops

Shit tyres!

[Drew]

Drew --Nope mate -did that on the test ride--Took it to the servo put air in tyres--yea i know not accurate but I was 250k from home.
Then off for a ride.
Put bike in neatral at 100km/h sat upright -gentle weave slowwing to around 40km/h-still a gentle weave
Very light pressure on brakes -No pulsing
Back to the guy selling it-Haul her over onto her sidestand and had his son balance it on back wheel/sidestand.--again 250 from home--ya do what ya gotta do.
grab the wheel -no bearing clunk--spin it--all good-
Check wheel runout with ye ol screwdriver on the forkleg-no visible runout.
Turn steering left to right -smooth with a tiny bit of resistance-
Grab wheel--tryn haul it back n forwards --nope tight as.
HMMMM

Without weight on the wheel and bearings it is quite often not noticable that there is a "notch" when turning the wheel.

For the sake of thirty bucks just change 'em mate.

[FROSTY:Me]

Im kinda thinking that myself. I thought yea cool toss a saet of my old race tyres on--new wheel and SH bearings in
SUCKS--the 96 YZF has a 110 front

[Kittyhawk]

That won't make it weave, though, just crab across the road. Oblig. DAMHIK Front wheel being out of alignment is normal, at least in corners

Ok so crabbing isnt the same as weaving...Im a newb lol..

[Grub]

What about the swing arm? If the weave is a slow lazy one then the swing arm is the only thing that has a long enough moment to generate that low frequency I would think. I don't have a clue as to how you check such a thing though.

from your description it sounds as if it doesn't get faster with speed? Just the same lazy weave? If that's the case, it can't have anything to do with wheels, Drew's thoughts about steering head sounded good but your tests seem to rule that out.

there is one other possibility of course, broken/cracked/soft frame! That's the only other thing i can think of that would have that low frequency - and that would be Bad.

[enigma51]

Case of beers says its the tires

[homer]

Are the tyres balanced

[scrivy]

One fork got less/more fluid or preload etc than the other?
Has the bike been jacked up at the rear or lowered at the front??
(If ya had 3 wheels - then it wouldn't matter!)

[Drew]

One fork got less/more fluid or preload etc than the other?
Has the bike been jacked up at the rear or lowered at the front??
(If ya had 3 wheels - then it wouldn't matter!)

We've covered this, rigs are for devients! And Frosty aint tough enough to get away with the shit your type gets up to.

[FROSTY:Me]

We've covered this, rigs are for devients! And Frosty aint tough enough to get away with the shit your type gets up to.

OYY-- Ive raced trikes a couple of times thank you.
Trouble is when ya do solo's back to back with trikes you take lines that put ya swingers head VERY close to the haybales. -Read that as the poor sod had hay stuck in their visor after one lap --ooops

[Mike748]

Im kinda thinking that myself. I thought yea cool toss a saet of my old race tyres on--new wheel and SH bearings in
SUCKS--the 96 YZF has a 110 front

I'm with Drew, if it were the tyres or rims I'd expect the weave to vary with speed but as it appears constant throughout such a large range of speed I suspect movement in SH bearings, or as Grub suggested the swingarm.

I'd expect the weave to reduce when on a lean as the frame is loaded up and not neutral.

....... So have you solved it yet?

[FROSTY:Me]

with my post count today Im at work so no no chance to get down n dirty on the bike

[Mental Trousers]

Swingarm bearings or rear wheel bearings??