unstable at high speeds - Page 3

FastDoc · 05-18-2009, 11:03 AM

I thought the stock tires were a fair compramise, but since mine is used 99% off pavement, I fitted some hard core knobbies.

Also, I would not be operating these bikes at WOT for long without considering a mixture change.

pimptron · 05-20-2009, 05:34 PM

30 psi is best 4 me

katoranger · 05-20-2009, 11:52 PM

I find 30psi good too. I ride almost all street though.

Allen

vet_stingray · 05-30-2009, 02:25 AM

I just lean forward so the wind goes over me helps settle the wobble and not so much a work out but it does tier ones back a bit... Not wind from the side sucks

SeerAtlas · 05-30-2009, 11:27 AM

What bikes are you guys riding? Waldo (Hanma/Hsun 200gy) is dead stable at 55mph (sprocket not here yet) and very smooth, hardly any engine vibration at all. Using stock dual purpose tires which are working fine for me in anything but deep sand, where that 2.75 x21 front is well, "exciting" LOL.

Seer

Dragon · 05-31-2009, 08:12 PM

Relax your grip.

phil · 05-31-2009, 09:11 PM

i can tell you that my gy 110 at 40 mph is steady but im shaking waiting for big boom and flying debris 8O btw its stock gearing needs changing

TheRealWorld · 05-31-2009, 10:40 PM

Just a thought on riding on low tires that have tubes. This puts a great deal of stress on the valve stem, and can lead to a failure quite soon. This is especially true on the drive tire.

joebrads · 05-31-2009, 11:31 PM

My theory is at higher speeds it handles ok but when you get a cross wind or wind from another car or windy day. The big ass front fender traps that air has no where to go. knocks you all over the road.

SeerAtlas · 06-01-2009, 12:32 AM

Over the years I've driven lots of different bikes in the wind and will tell you that even my 1000 lb Kawa 6cyl Voyager will move in a crosswind.
My impression is that these guys are talking about something else, something abnormal. First thing I'd do is get someone in a car or other bike to follow behind me as I went down the road to make sure the bike is tracking true, i.e the whole thing is in alignment. Second, I'd life the bike in the center so both wheels are off the ground and free, and I'd spin em to make sure they are turning freely, and that the brakes aren't grabbing in a particular spot.
if that doesn't work then I'd think about my CG and horizontal aspect profile. If you've got a big trunk on your rear rack and its blowing like hell from the side, I can promise you that bike is going to be a serious pita to keep in a straightline. High aspect profiles to the wind are not good for stability. AND, since the wheels operate like gyros, (which is basically why you can ride a bicycle /motorcycle in the first place_ *generally* speaking, the larger the diameter, the more stable.

good luck.

seer

05-18-2009, 11:03 AM	#31
FastDoc Join Date: Mar 2009 Location: Southeastern Washington desert Posts: 14,761	I thought the stock tires were a fair compramise, but since mine is used 99% off pavement, I fitted some hard core knobbies. Also, I would not be operating these bikes at WOT for long without considering a mixture change. __________________ Happy to serve.
	0

05-20-2009, 11:52 PM	#33
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	I find 30psi good too. I ride almost all street though. Allen __________________ You meet the nicest people on a Honda Clone.
	0

05-30-2009, 11:27 AM	#35
SeerAtlas Join Date: Apr 2009 Posts: 770	What bikes are you guys riding? Waldo (Hanma/Hsun 200gy) is dead stable at 55mph (sprocket not here yet) and very smooth, hardly any engine vibration at all. Using stock dual purpose tires which are working fine for me in anything but deep sand, where that 2.75 x21 front is well, "exciting" LOL. Seer __________________ Seer's First LAW-"FLY THE PLANE!", fail that, and nothing else matters. 12th Law- Consider what marvels you might do if only you had tomorrow to live over again. Third Law-When someone tells you some thing "Can't Be Done", what they're really saying is They can't do it!!14th Law-Just because something "IS", doesn't necessarily mean it SHOULD be.. Eighth Law-The only true personal security is anonymity.Ninth Law-Humans tend to learn very little when speaking.10th Law-Some lives ARE worth taking
	0

05-31-2009, 08:12 PM	#36
Dragon Join Date: Nov 2007 Location: Tejas Posts: 834	Relax your grip. __________________ Chinabikeless
	0

05-31-2009, 09:11 PM	#37
phil Join Date: Jun 2008 Location: wise va Posts: 636	i can tell you that my gy 110 at 40 mph is steady but im shaking waiting for big boom and flying debris 8O btw its stock gearing needs changing __________________ halls auto l coolster, modcycles, yanmar & zongshen, dealer fired roketa,lifan and jet moto and apollo quit me who's next
	0

05-20-2009, 05:34 PM	#32
pimptron Join Date: May 2009 Location: maple ridge BC Posts: 22	30 psi is best 4 me
	0

05-30-2009, 02:25 AM	#34
vet_stingray Join Date: Apr 2009 Posts: 114	I just lean forward so the wind goes over me helps settle the wobble and not so much a work out but it does tier ones back a bit... Not wind from the side sucks
	0

05-31-2009, 10:40 PM	#38
TheRealWorld Join Date: Jun 2008 Posts: 817	Just a thought on riding on low tires that have tubes. This puts a great deal of stress on the valve stem, and can lead to a failure quite soon. This is especially true on the drive tire.
	0

05-31-2009, 11:31 PM	#39
joebrads Join Date: Mar 2009 Posts: 36	My theory is at higher speeds it handles ok but when you get a cross wind or wind from another car or windy day. The big ass front fender traps that air has no where to go. knocks you all over the road.
	0

06-01-2009, 12:32 AM	#40
SeerAtlas Join Date: Apr 2009 Posts: 770	Over the years I've driven lots of different bikes in the wind and will tell you that even my 1000 lb Kawa 6cyl Voyager will move in a crosswind. My impression is that these guys are talking about something else, something abnormal. First thing I'd do is get someone in a car or other bike to follow behind me as I went down the road to make sure the bike is tracking true, i.e the whole thing is in alignment. Second, I'd life the bike in the center so both wheels are off the ground and free, and I'd spin em to make sure they are turning freely, and that the brakes aren't grabbing in a particular spot. if that doesn't work then I'd think about my CG and horizontal aspect profile. If you've got a big trunk on your rear rack and its blowing like hell from the side, I can promise you that bike is going to be a serious pita to keep in a straightline. High aspect profiles to the wind are not good for stability. AND, since the wheels operate like gyros, (which is basically why you can ride a bicycle /motorcycle in the first place_ generally speaking, the larger the diameter, the more stable. good luck. seer __________________ Seer's First LAW-"FLY THE PLANE!", fail that, and nothing else matters. 12th Law- Consider what marvels you might do if only you had tomorrow to live over again. Third Law-When someone tells you some thing "Can't Be Done", what they're really saying is They can't do it!!14th Law-Just because something "IS", doesn't necessarily mean it SHOULD be.. Eighth Law-The only true personal security is anonymity.Ninth Law-Humans tend to learn very little when speaking.10th Law-Some lives ARE worth taking
	0