swaying in hard corners

megaloxana · Post by **megaloxana** » Mon Jul 21, 2008 6:55 pm

Alright so I just got back from the first decent ride I've had all year as Im trying to fine tune the carbs. Anyway Im taking a hard corner on some pretty decent road, dont remember how fast(50-60?). So the bike starts to sway as I'm taking this turn.
This is the first time I noticed this and I've ridden much harder before.

what could cause this?

Suspension is stock except for the dogbones which raised the bike. Tires have less than 600 miles on them.
The front suspension is pretty soft(duh) and the rear shock doesn't seem too bad(i weigh 140lbs).

tommyj27 · Post by **tommyj27** » Tue Jul 22, 2008 12:21 pm

silly question, did you check your tire pressure?

megaloxana · Post by **megaloxana** » Tue Jul 22, 2008 1:02 pm

tommyj27 wrote:silly question, did you check your tire pressure?

will tonight

shift · Post by **shift** » Tue Jul 22, 2008 7:07 pm

your new tires don't happen to be the continental attacks, do they? also, was it a "sway" from the rear, or a headshake from the front?

Post by **haunter** » Tue Jul 22, 2008 7:25 pm

swaying on turn in you say?

Post by **ragedigital** » Tue Jul 22, 2008 8:21 pm

I had hemlet shake from all the wind today. Started around 80mph. Almost unbearable.

megaloxana · Post by **megaloxana** » Tue Jul 22, 2008 8:31 pm

shift wrote:your new tires don't happen to be the continental attacks, do they? also, was it a "sway" from the rear, or a headshake from the front?

No they're BT014's. The shake seemed like it was from the front.

Post by **haunter** » Tue Jul 22, 2008 8:53 pm

it happens on real hard braking

shift · Post by **shift** » Tue Jul 22, 2008 9:09 pm

megaloxana wrote:
shift wrote:your new tires don't happen to be the continental attacks, do they? also, was it a "sway" from the rear, or a headshake from the front?
No they're BT014's. The shake seemed like it was from the front.

sounds like your body weight was too far back on the bike when it happened. you mentioned you have a dog bone linkage raising your rear up. do you know how much it was raised at the rear axle? what happens is, raising the rear decreases the rake of the front fork, which in turn makes the bike handle faster. it also makes the bike less stable. so you have to find the comfy trade off point.

i would be coming out of turn 17 on virginia international raceway north circuit and get a headshake shifting into 5th and then again at the kink at 14,000 rpm in 6th gear while leaned over. turns out, my body weight was too far back on the bike. i had my r6 shimmed up 4mm at the shock, which translated to 12mm at the rear axle. shifting my weight forward relieved the headshake.

if it doesn't help by shifting your weight more forward, try dropping the forks in the triple clamps a few mm's to get back a bit of fork rake.

megaloxana · Post by **megaloxana** » Tue Jul 22, 2008 9:29 pm

shift wrote:
megaloxana wrote:
shift wrote:your new tires don't happen to be the continental attacks, do they? also, was it a "sway" from the rear, or a headshake from the front?
No they're BT014's. The shake seemed like it was from the front.
sounds like your body weight was too far back on the bike when it happened. you mentioned you have a dog bone linkage raising your rear up. do you know how much it was raised at the rear axle? what happens is, raising the rear decreases the rake of the front fork, which in turn makes the bike handle faster. it also makes the bike less stable. so you have to find the comfy trade off point.

i would be coming out of turn 17 on virginia international raceway north circuit and get a headshake shifting into 5th and then again at the kink at 14,000 rpm in 6th gear while leaned over. turns out, my body weight was too far back on the bike. i had my r6 shimmed up 4mm at the shock, which translated to 12mm at the rear axle. shifting my weight forward relieved the headshake.

if it doesn't help by shifting your weight more forward, try dropping the forks in the triple clamps a few mm's to get back a bit of fork rake.

I 'll see if I cant move my forks down some more. I'll go take another good ride soon enough and focus on shifting forward to see if that fixes the problem.

Thanks for the tips shift.

ps. where you been? haven't seen ya around in a while.

shift · Post by **shift** » Wed Jul 23, 2008 5:44 am

man, i've been swamped with a new job and i am trying to get back into endurance mountain bike racing -- which takes lots of seat time pedaling. i feel like i don't have time for anything anymore. grrrrr.

good luck with curing the stability issue. let us know how it goes.

ThisEndUp · Post by **ThisEndUp** » Wed Jul 23, 2008 6:23 am

Have you ever set the sag on the bike?

Makes a bit of a difference in handling.

yamaha_george · Post by **yamaha_george** » Wed Jul 23, 2008 6:32 am

ThisEndUp wrote:Have you ever set the sag on the bike?

Makes a bit of a difference in handling.

THE

Talking of which went out this morning for a spin of 50 miles and the new PD valve & springs are fantastic in the fast sweepers and are far more inspiring on tight curves

Mr. Rossi watch out LoL

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