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No hands: bike pulls right.
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activedirt Offline
1st Service Completed

Virginia
Posts: 106
Joined: Sep 2015
Post: #1
No hands: bike pulls right.
I do hope that this has yet to be discussed on this forum. I did search for it a couple of times but came up empty.

Presently I either own or have owned three (3) different bikes in the past 2+ years. All three bikes pull to the right when I let go of the handlebar as I'm slowing to eventually stop. The Africa Twin does it the most, and by far the most. The CB1100 and the Yamaha FZ07 are basically the same in this regard with perhaps the CB1100 exhibiting this quality the least. I've used Google to find the answer but am left with no firm answer. Please allow me to now turn to this fine and informative forum for a solution. My guess is that this is caused by:
.
1) The Gyroscopic effect of "Engine Brake". This would account for the Africa Twin exhibiting this tendency the most and the CB1100 the least.
2) A misaligned rear wheel.
3) The crown in middle of the road (I don't think this is the answer as this pull-to-the-right is very consistent).
.
In the Gyroscopic effect, a turning wheel moves as though the force was actually applied 90 degrees down stream from the real point of pressure. The term down stream means in the direction of the spin.

2017 Africa Twin
2017 Yamaha FZ-07
11-11-2017 03:59 PM
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Ben70 Offline
1st Service Completed

NCAL
Posts: 197
Joined: Sep 2016
Post: #2
RE: No hands: bike pulls right.
I'll have to try that tomorrow and see if mine does it too.
It would be interesting to know if any of our friends from the land of Oz find the pull going to the left. Either road crown or corioilis force may be coming into play Wink

Ben
11-11-2017 05:36 PM
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Cormanus Offline
Moderator

Queensland, Australia
Posts: 10,363
Joined: Dec 2013
Post: #3
RE: No hands: bike pulls right.
Pterodactyl recently had a problem similar to this and found his front forks were out of alignment.
11-11-2017 06:59 PM
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Retsel Offline
Running Like a Top

Pacifica
Posts: 467
Joined: Nov 2015
Post: #4
No hands: bike pulls right.
There is a steep hill on my way home. I usually take it in neutral with hands off. At first it wabbled a bit. After correcting tire pressures it tracks perfectly.

Sent from my Moto G (5) Plus using Tapatalk
11-11-2017 07:03 PM
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W/R Offline
1st Service Completed

New Brunswick, Canada
Posts: 116
Joined: May 2017
Post: #5
RE: No hands: bike pulls right.
My guess is that it has something to do with the driveline being positioned on the left side.

2014 CB1100A
2009 Buell Ulysses XB12XT
2007 CRF450X
2003 HD Night Train with sidecar
11-11-2017 07:10 PM
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LongRanger Offline
Road Warrior

Evergreen, CO
Posts: 1,689
Joined: Aug 2015
Post: #6
RE: No hands: bike pulls right.
How worn is your front tire?

"Happiness makes up in height for what it lacks in length." - Robert Frost
'14 Honda CB1100 DLX #000094
'13 BMW F800GT
'06 Ducati Monster 620
'98 BMW K1200RS
11-11-2017 10:00 PM
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activedirt Offline
1st Service Completed

Virginia
Posts: 106
Joined: Sep 2015
Post: #7
RE: No hands: bike pulls right.
(11-11-2017 10:00 PM)LongRanger Wrote:  How worn is your front tire?

The tires were on that bikes that I purchased new.

In reading these post I realized that I can put the FZ07 in neutral and give this a try to see if that makes any difference. The Africa Twin is a DCT so there is no way to put that bike into neutral while it is in motion. So sometime this week, weather permitting, I'll this again with the fz07 bike in gear and with it in neutral and determine the difference.

Thanks to those who responded.

2017 Africa Twin
2017 Yamaha FZ-07
11-12-2017 12:47 PM
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activedirt Offline
1st Service Completed

Virginia
Posts: 106
Joined: Sep 2015
Post: #8
RE: No hands: bike pulls right.
(11-11-2017 03:59 PM)activedirt Wrote:  Presently I either own or have owned three (3) different bikes in the past 2+ years. All three bikes pull to the right when I let go of the handlebar as I'm slowing to eventually stop. . . . . .

. . . . My guess is that this is caused by:
.
1) The Gyroscopic effect of "Engine Brake". This would account for the Africa Twin exhibiting this tendency the most and the CB1100 the least.
. . . . .
In the Gyroscopic effect, a turning wheel moves as though the force was actually applied 90 degrees down stream from the real point of pressure. The term down stream means in the direction of the spin.

Now herein is a marvelous thing....

Today I take the Yamaha FZ-07 for a ride down some Virginia back roads to Rocky Mount Va. Route 116 then right onto Route 122 into Rocky Mount. The trip home is Route 635 then left onto Route 116.

This trip gives me several opportunities to test the tendency of this bike to pull to the right as I am slowing. This only happens when as I am slowing to stop and I let go of the handlebars, which also means, of course, I have let go of the throttle. I run several tests at roughly 31-35mph and the bike in third gear. It consistently has a slight pull to the right, which also means the front wheel is slightly turning to the left! I repeat the same test but this time I put the bike into neutral. When in neutral there is no pull to the right, none!

This bike, the Yamaha FZ-07, has a reasonable amount of engine brake. Not as much as an Africa Twin but more that the smooth CB1100. At this point I am of the opinion that this trait can be attributed to the Gyroscopic steering effects of the engine brake

2017 Africa Twin
2017 Yamaha FZ-07
11-13-2017 04:17 PM
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