Rear motor mount dyna wobble.possible engine alignment needed
Thread Starter
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Road Master
Joined: Mar 2017
Posts: 961
Likes: 192
From: Chicago
Rear motor mount dyna wobble.possible engine alignment needed
long story short my bike is an 09 dyna. Upgraded front and rear ohlins, jd fab tsport fairing, fresh tires(about 3k) bearings are in good condition. Also checked fallaway and adjusted accordingly at 10k miles (bike has 10,500 rn), and a predator front mount. Ive always had a wobble around 95 100 mph (front gets uncomfortably unstable) with all these parts which leads me to believe my engine is out of alignment. My problem became exaggerated when I installed a chopper haus rear motor mount which I had to fight to install. Few months running the rear mount I just recently decided I didnt like it because over bumps I would get a knocking as if something was hitting my cases. Removed rear mount and re installed my stock oem mount come to look the tab on the transmission where the rear motor bolts to has shifted about 3/8in towards the primary side causing the mount to not line up with the holes in the swingarm where it bolts up too. Is this a dead giveaway that my motor is out of alignment?
Seasoned HDF Member
Joined: Dec 2010
Posts: 6,849
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From: Florida
loosen the bolts to the front mount, including the center bolt, and then do an alignment when you get the rear one in. Do the alignment with everything loose and follow what your manual says
Grand HDF Member
Joined: Oct 2006
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From: DFW
Quick disconnect can remedy this.
Cruiser
Joined: May 2016
Posts: 227
Likes: 45
From: Santa Maria
long story short my bike is an 09 dyna. Upgraded front and rear ohlins, jd fab tsport fairing, fresh tires(about 3k) bearings are in good condition. Also checked fallaway and adjusted accordingly at 10k miles (bike has 10,500 rn), and a predator front mount. Ive always had a wobble around 95 100 mph (front gets uncomfortably unstable) with all these parts which leads me to believe my engine is out of alignment. My problem became exaggerated when I installed a chopper haus rear motor mount which I had to fight to install. Few months running the rear mount I just recently decided I didnt like it because over bumps I would get a knocking as if something was hitting my cases. Removed rear mount and re installed my stock oem mount come to look the tab on the transmission where the rear motor bolts to has shifted about 3/8in towards the primary side causing the mount to not line up with the holes in the swingarm where it bolts up too. Is this a dead giveaway that my motor is out of alignment?
If everything is already apart you can check alignment with a digital (or analog) angle finder. Get the bikes horizontal plane zero'd out then check the vertical on the back tire (brake rotor). Should be 90 degrees when the horizontal plane is level. Keep in mind most gauges found on amazon/ebay will have a + - .2 degree. In other words, if you measure at the rotor and it says 89.8 it very well could be fine.
Bad neck bearings, improper tire inflation, and a cupped front tire will also cause the symptoms you are describing.
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The crossover is 1/4" ID. My valve is from Goodridge, but other companies make them as well.
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Thread Starter
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Road Master
Joined: Mar 2017
Posts: 961
Likes: 192
From: Chicago
Get up to speed (maybe around 40) on a nice paved straight road and pull your hands off the bars. Does the bike track straight? If it does, probably not an alignment problem. If it pulls one way or the other it probably needs an alignment.
If everything is already apart you can check alignment with a digital (or analog) angle finder. Get the bikes horizontal plane zero'd out then check the vertical on the back tire (brake rotor). Should be 90 degrees when the horizontal plane is level. Keep in mind most gauges found on amazon/ebay will have a + - .2 degree. In other words, if you measure at the rotor and it says 89.8 it very well could be fine.
Bad neck bearings, improper tire inflation, and a cupped front tire will also cause the symptoms you are describing.
If everything is already apart you can check alignment with a digital (or analog) angle finder. Get the bikes horizontal plane zero'd out then check the vertical on the back tire (brake rotor). Should be 90 degrees when the horizontal plane is level. Keep in mind most gauges found on amazon/ebay will have a + - .2 degree. In other words, if you measure at the rotor and it says 89.8 it very well could be fine.
Bad neck bearings, improper tire inflation, and a cupped front tire will also cause the symptoms you are describing.
come to think of it my bike always tracked slightly to the left with no hands that may be why my rear motor mount transmission tab was not aligned with holes in the swingarm
