Rear Vibration

[punisher]

Gday, I have a 2006 Kawasaki Vulcan 1500 Classic with 17000 miles that I need some help with. I bought the bike about a month ago and it came with the vibration. This being my second, I'm clueless to issues that a used motorcycle might bring. Add ons I have Vance and Hines longshots with stock air intake. Here are the current issues.

1. When at idle and you rev up the engine the back fender, license plate, baggage bar vibrate rigorously. When I'm riding and use engine brake the rear all vibrates. When you pull in the clutch the vibration goes away. I believe when I shift the rear vibrates and looking at it today the whole bike vibrates slightly at idle. I checked the pipes they are tight except the lower pipe on the l curve am able to move it back and forth. Not sure if something is missing their. I can tighten the bolts at the bracket and up top and it still moves.

2. Power Commander III USB registers my RPM between 1250 to 1350. If I try to bring it down to 950, per the service manual, the motorcycle just dies out, not sure if this has anything to do with the vibration issue. Using Vance and Hines longshots with stock air intake map.

Any help would be great.

Thanks
Punisher

[ldhthept]

Take power commander off and run it stock, see if problem goes away. If so, maybe PC installed incorrectly. Go from there...

[vulcanscott]

Check the motor mount rubbers !

[BudMan]

I don't believe the power commander is the cause of the vibration.
Something is loose somewhere. Scott may be on to something.
The exhaust pipe shouldn't be moving, but if a mount for it is missing it shouldn't cause the entire back of the bike to shake.
With a stock intake it wouldn't hurt to remove the power commander.
See how it does without it.

[punisher]

Thanks for the info. Going to remove the PC tomorrow and see what happens. I will post findings afterwards.

Thanks

[minst7877]

If you can't get it to idle at the proper RPM your throttle body needs to be cleaned. Get a toothbrush and some sea Foam and give it a good scrubbing.

DC

[Rok]

If you can plug into the Power Commander with a laptop, you can change the map to stock without physically removing it. That doesn't rule out a bad connection to an injector but it's a lot less work. No sense demo'ing a perfectly good part if you don't need to. I'd be checking spark plugs too, since it's a new to you bike. This could be an ignition miss too.
BTW, if you suspect an electrical issue, the first logical place to start is to see if there are any codes present. If one injector is lame, it'll tell you which one.
My 2 cents.
Rok

[mbarr10]

This being my second, I'm clueless to issues that a used motorcycle might bring

Your second Bike or your second 1500?

When I had my 07 1500 classic my gloves on the seat would vibrate off at idle while on the kickstand. So I think that part of the vibration may be normal.

Have you checked the plugs Color and gap? It may tell you something

[mbarr10]

Ye a weak battery will make it run rough, have you noticed problems starting the bike?. It will still run but acceleration and power will be poor. The motor runs off the battery and the charging system charges the battery. The battery charges it takes a lot of power. If it is shot will take the majority of the available current, that leaves very little in the for the rest. Weak batteries can do all sorts of strange things. Get a meter on it and check the voltage with no load min 12.6v if you drop test it so much the better. start it and make sure that you are getting at 13.8 volts...

Found this on another thread, Being a used bike.....Another possible Idea?