Author Topic: Motor Sound/Vibration during Deceleration  (Read 105 times)

dswangard

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Motor Sound/Vibration during Deceleration
« on: January 01, 2018, 06:10:56 PM »
Hello All.
My first time on the Forum and first time posting. Hoping someone out there can help me.
I have a 2013/2014 Empulse.
I'm hearing a sound and vibration from the bike when I come off the throttle and the motor is decelerating - as I'm off the throttle completely. The clunk or click coincides with the turning of the motor - the frequency slows as the bike slows.
A couple other things I've noticed:
1. When the regen is off due to the bike being cold the sound seems to be diminished.
2. When I engage the clutch and coast the sound disappears completely.
I think the sound/vibration is very slowly getting worse AND the bike is my primary mode of transportation... But, I've been taking public transportation the past month and riding it as little as possible.
Thoughts?

lamber

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Re: Motor Sound/Vibration during Deceleration
« Reply #1 on: January 01, 2018, 06:52:20 PM »
What have you done to diagnose/how familiar are you with motorcycle maintenance?  Have you checked chain tension?  The chain can rub underneath the swingarm if it's loose.
- 2014 Empulse R
- 75% complete KLX250 conversion

Shinysideup

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Re: Motor Sound/Vibration during Deceleration
« Reply #2 on: January 01, 2018, 09:23:41 PM »
Two items in your description conflict with each other:

"The clunk or click coincides with the turning of the motor..."

and then:

"When I engage the clutch and coast the sound disappears completely."

To me, this points to the sound NOT coming from the motor but possibly from the gear box. A broken tooth, maybe? Anything odd show up on the drain plug magnet during your last oil change?

Richard230

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Re: Motor Sound/Vibration during Deceleration
« Reply #3 on: January 02, 2018, 10:03:41 AM »
The first thing I would do is to inspect the condition of the chain and sprockets and to make sure that the drive chain is has the correct amount of slack.  (I always like to do the easy and cheap stuff first and then move on to the more time-consuming and expensive tasks.  ;)  )
current bikes: 2018 16.6 kWh Zero S, 2011 Royal Enfield Bullet 500 Classic, 2009 BMW F650GS, 2007 BMW R1200R, 2005 Triumph T-100 Bonneville, 2002 Yamaha FZ1 and a 1978 Honda Kick 'N Go Senior.

Shinysideup

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Re: Motor Sound/Vibration during Deceleration
« Reply #4 on: January 03, 2018, 01:36:14 AM »
Agree with simple/cheap first!

 I had a tick-tick-tick noise that varied with my speed. Turned out it was a frozen link on a 20K mile chain. But holding the clutch in obviously didn't stop the chain from going around.

dswangard

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Re: Motor Sound/Vibration during Deceleration
« Reply #5 on: January 03, 2018, 11:42:53 AM »
Thanks for your responses.
Yes, I checked the chain myself and had it inspected at my local shop. In addition, I lubed the chain just to make sure that wasn't the issue.
The bike has 8000 miles and has been in for regular service. I changed the oil less than 500 miles ago and there was nothing unusual on the magnetic portion of the pan screw.
I think I'm gonna try and call Victory and see if they might have someone I can talk to.
Unfortunately, it seems no one in the Bay Area services the Empulse regularly.
Does anyone out there have a good mechanic I could talk to who knows the bike?
Thanks!
Dan