I"ve owned a 2007 Road King Classic since new,it has about 11,000 miles on it.The bike has not been abused and is well taken care of.One day coming hone from work on a straight road doing about 70 the bike started to wobble,I slowed down and the wobble subsided yet the bike felt loose.The next day I checked the tire pressure and both front and rear were low,aired them up to 36 lbs as I ride solo most of the time and went for a ride,no wobble and bike felt good.Yesterday riding to work same road I passed a car and was doing around 70 again and OMG!! Wicked wobble ,had to slow way down to get it to stop.Coming home from work no wobble but did not go over 65.I have been reading the post and see everything from swingarm bearings to bushings maybe the cause.I find it hard to think that a bike with this low of miles could hae those parts worn out but who knows,I've owned big Hondas and put alot of miles on them and never felt this sort of thing,I did have a new rear tire put on by the dealer abot 300 miles ago and am wondering if maybe somethingmight be out of alingment?They did not tighten op the right side exhaust hanger and it flew off on way home then had no problem selling me a new one so not sure if I trust them or their work.I have had this bike at speeds of 70 + on highways solo and 2 up many times and never had this problem.If anyone might have any ideas what might be going on I could use the help

 

I would definitely look at the rear tire alignment. What does your front tire look like? Have you checked your front wheel bearings?

 

Check your manual. If you are running 36 psi in both the front and rear tire, the rear may be seriously underinflated. For example, on my RKC, the recommended pressures are 36 in the front but 40 in the rear. If that is your recommendation, you're running 36 in the rear, you're 10% under pressure which could account for the wobble.

But don't use the pressures I mention. Read the manual!!

 

Indeed! And if you are heavy, or carrying a passenger, increase pressures a little above book. If you are using aftermarket tyres, check the brand website for correct pressures, which may be higher than in the book.

We have plenty of threads about 'wobble', so do a bit of homework, reading through recent ones. There are several things that can affect your bike's handling.

 

on my 2000 road king i ride many time over 100 mph i experienced wobble 1 time it was air pressure low rear tire

 

Does your bike sit in one spot for extended periods? Maybe you have developed a "flat spot". This is more predominantly found on bias ply tires on big equipment, but it could happen on a bike too.

Pressure is very important, do you remember hitting any potholes while under inflated? You could have separated a ply as well.

Good luck, and check those pressures every week!

 

type into search, Wobble, there is a multi page post on "bagger wobble exposed" read it. Neck bearings, swing arm bushings, tires, true track system, all explained in detail.

 

If you have spokes I would check them very carefully. Twice I had broken spokes and had the identical thing happen to me. Once I thought I was gonna crash at highway speeds. After the second time I got rid of the spoked wheels and will never go back. That may not be your issue but if you have spokes check them out. They should all sound the same when tapping on them. If any sound strange that should be your problem.

 

Everything above but especially the neck bearings. They almost always need an initial adjustment after a few thousand miles. Second, the spokes. I am another who will never have spoked wheels. Third, is there a balance weight anywhere on the rear wheel? A tire/wheel assembly NOT needing a little balance weight is very rare. Perhaps they didn't balance the wheel with the new tire or the weight came off. The more tire pressure, the less wobble. While many will think I'm trying to commit suicide, I run my tires a few pounds OVER the sidewall limit (set cold). I have no idea if my gauge reads higher or lower than actual pressure so I assume it reads too high and add a few psi to get the actual pressure up to the sidewall limit. If there is a little seepage between checks I will still have adequate pressure for safety. I have never had any cupping and get well above average tread wear mileage.

 

Rolling straight and having it suddenly break into a wobble is not what I would think of as classic bagger wobble. The recent tire work would be highly suspect imo, due to its recentness, especially if you haven't had the bike up to these speeds in the 300 miles since the tire was mounted.

Were it my bike, I'd be highly inclined to put it on a jack and start going through it starting at the rear since that tire was recently changed. Looking for proper belt tension, play, steering head drop away, wheel balance, tire roundness, bead mount, etc. Just carefully examining and checking things.