02-07-2016, 03:33 AM
(02-07-2016, 12:42 AM)The ferret_imp Wrote: Yea that could be critical information.
Remove it and go for a ride.
I can tell you that when I worked in the industry 30 years ago, there were some complaints about wobble on Gold Wings here in the USA. Honda attributed it to luggage racks and top cases and their fix was to affix this huge weight to the front of the steering head (maybe a loaded topcase unweights the front end?). I also know that Honda does not offer ST top cases in the US... but many members buy them from overseas. Maybe on some bikes the balance point is finely figured and changes to one end affects the other end?
Interesting!
ST, meaning the Pan Am I assume?
(02-07-2016, 01:35 AM)CIP57_imp Wrote: With the front faring your down pressure on the front causes the rear to get light @ speed, the top case would increase wobble. Take it off and make sure that your screen is the same angle ( very important) as your front forks. The larger screens will cause side wind pressure, be careful with larger screens over 100MPH
I've had my CB up to 140+ with a cut down shield with no wobble or head shake. The screen helped stability.
aha!
1 problem, I have the Road Comet I faring with the larger than stock touring screen, called Aero screen.
I cannot change anything on the fairing or on the screen.
But, I do plan to get the stock size screen wich should improve the wind noise....(and perhaps the wobbling at those speeds, not that I would ride so hard all the time, wrong bike and I dont really care, it was just to test
)(02-07-2016, 03:14 AM)the_undecider_imp Wrote: I'm willing to bet it's the huge top case. Empty or loaded, it will have an adverse affect on high speed stability. Extra weight on the back will lighten up the front end. Also, the air currents coming around the front of the bike and your torso will catch that top case and create either wind buffeting or could but pushing down on the top case somewhat like a spoiler on a car. I also don't think you can rule out the fairing creating lift on the front end. The reason sport bikes have such a pointed nose is to help create down force up front. Same goes for the ugly beaks on adventure bikes. The Road Comet is somewhat blunt in profile, so it might be lifting the front of the bike.
actually, I did not felt a big difference in buffeting with that top case on, in the contrary I had the impression there was a bit less buffeting, especially from my back.
Does that sound valid?
I also wonder how come on my Burgman 650 with topcase, I never experienced wobbling and it was really riding on rails at its topspeed of 107 mph...something to do with the layout?
The topcase on a burgman sits much higher than on a CB and it has sa HUGE windscreen.
They both weigh more or less the same too...260kg wet for the CB and 279 for the scooter