Author Topic: Drivetrain noise  (Read 3649 times)

Offline Darkstar

  • Trade Count: (0)
  • Formula Extreme Racer
  • ***
  • Posts: 369
  • Karma: +1/-0
Drivetrain noise
« on: May 19, 2017, 03:20:56 PM »
With low speed torque I hear a quick but intermittent grinding noise from below. It just started and happened twice today when slow rolling through an intersection, in 2nd gear when Im too lazy to downshift and the clutch is in. I let it out and heard the sound. Last week I put a new chain on and both sprockets look great, so originals are still there. Previous chain had stretched slightly out of spec with a few tight links. I discovered the links when I started hearing clicks sounds from the front sprocket. (A) Perhaps I rode on the stretched chain too long, with some tight spots, and it wore a bearing and/or shaft? (B) or clutch pressure plates? Everything else it good and its running strong. Any feedback would be appreciated.
2007F with 22k NY/NJ miles. Stock exhaust/airbox. Rejet to 20/60/132/one o-ring/1.25 turns out, +2 mojo

Offline Watcher

  • What is this? I always know...
  • Trade Count: (0)
  • MotoGP Racer
  • ******
  • Posts: 2403
  • Karma: +36/-0
  • MSF RiderCoach and Moto Enthusiast!
Re: Drivetrain noise
« Reply #1 on: May 19, 2017, 04:09:51 PM »
The chain will always make noise, but if the chain has too much slack or isn't in alignment it will make MORE noise.
I'd double check your slack and alignment with a tool, not just with the sight gauges on the swingarm.

Can you get a picture of the sprockets for a second opinion?
"The point of a journey is not to arrive..."

-Neil Peart

Offline Darkstar

  • Trade Count: (0)
  • Formula Extreme Racer
  • ***
  • Posts: 369
  • Karma: +1/-0
Re: Drivetrain noise
« Reply #2 on: May 19, 2017, 04:22:47 PM »
Maybe you're right. I just aligned, tightened to spec this week. I've ridden my chain all over the place, too tight, too loose, off center so I know what those sound like, but maybe putting a new chain on old sprockets would do this. The teeth all look good. I'll loosen it a hair and see if it clears up.
« Last Edit: May 19, 2017, 04:32:27 PM by Darkstar »
2007F with 22k NY/NJ miles. Stock exhaust/airbox. Rejet to 20/60/132/one o-ring/1.25 turns out, +2 mojo

Offline Watcher

  • What is this? I always know...
  • Trade Count: (0)
  • MotoGP Racer
  • ******
  • Posts: 2403
  • Karma: +36/-0
  • MSF RiderCoach and Moto Enthusiast!
Re: Drivetrain noise
« Reply #3 on: May 19, 2017, 05:03:24 PM »
Didn't you just switch to an oringless chain?  I wonder if they're naturally louder...


Of course it could be the sound of the engine lugging if you're basically in 2nd at first gear speeds.

Any way of getting a sound clip?
"The point of a journey is not to arrive..."

-Neil Peart

Offline Darkstar

  • Trade Count: (0)
  • Formula Extreme Racer
  • ***
  • Posts: 369
  • Karma: +1/-0
Re: Drivetrain noise
« Reply #4 on: May 19, 2017, 05:44:12 PM »
I really doubt it's the chain links themselves, it's not that kind of noise. and it's not lash or a lugging sound either. more of a grind with tone, like metal on metal. it's intermittent and only happened twice for a split second during  a 30 minute ride so a sound clip will be tough. my other thought is that that the summer heat has skyrocketed, it's 91F, and metal expands...so this could be something thats been around all winter and now more evident
2007F with 22k NY/NJ miles. Stock exhaust/airbox. Rejet to 20/60/132/one o-ring/1.25 turns out, +2 mojo

Offline Watcher

  • What is this? I always know...
  • Trade Count: (0)
  • MotoGP Racer
  • ******
  • Posts: 2403
  • Karma: +36/-0
  • MSF RiderCoach and Moto Enthusiast!
Re: Drivetrain noise
« Reply #5 on: May 19, 2017, 06:14:03 PM »
Still, compared with engine operating temp 91 is nothing...
"The point of a journey is not to arrive..."

-Neil Peart

Offline Darkstar

  • Trade Count: (0)
  • Formula Extreme Racer
  • ***
  • Posts: 369
  • Karma: +1/-0
Re: Drivetrain noise
« Reply #6 on: May 19, 2017, 06:18:30 PM »
yeah but the shaft and bearings are a bit isolated from engine heat, right?
2007F with 22k NY/NJ miles. Stock exhaust/airbox. Rejet to 20/60/132/one o-ring/1.25 turns out, +2 mojo

Offline tobyd

  • Trade Count: (+1)
  • Formula Extreme Racer
  • ***
  • Posts: 252
  • Karma: +3/-0
Re: Drivetrain noise
« Reply #7 on: May 20, 2017, 03:27:55 PM »
Had a similar sounding low-speed grinding noise when I had the chain alignment and tension wrong. Went away after I re-aligned it and tensioned the chain ( to about 20mm free-play ) on the side-stand rather than the centre-stand. I understand there has been some debate about the CS vs SS tension though so YMMV.

Offline Darkstar

  • Trade Count: (0)
  • Formula Extreme Racer
  • ***
  • Posts: 369
  • Karma: +1/-0
Re: Drivetrain noise
« Reply #8 on: May 20, 2017, 05:44:35 PM »
chain

Bingo. I had my tension set to 20-25 mm on center stand and checked about four spots. Problem was the section with the masterlink was slightly tighter, measured 15-20mm, too tight. This explain why it's intermittent. Thanks for the sanity check dude
2007F with 22k NY/NJ miles. Stock exhaust/airbox. Rejet to 20/60/132/one o-ring/1.25 turns out, +2 mojo

Offline user11235813

  • Trade Count: (0)
  • AMA Superbike Racer
  • ****
  • Posts: 637
  • Karma: +9/-0
Re: Drivetrain noise
« Reply #9 on: July 16, 2017, 08:31:46 AM »
I understand there has been some debate about the CS vs SS tension though so YMMV.

I don't think there's any debate about that, the manual says 20 30mm on the side stand and so the engineers win. However I think 20 doesn't give any room for error and slightly tight is worse than slightly loose as it puts strain on the bearings.

Having said that I check my chain on the centre stand for consistency but first I adjusted it correctly on the side stand and then put it on the centre stand and used that as the  aim point, which for me means that on the centre stand you should be able to push the chain up so that it almost touches the bottom of the chain guide.

I do the same with the oil, I check it after it's been sitting all night rather than warm it up for 3 mins and let it sit for 3 mins. Turns out that 4 mm above the F mark is about right using the cold method.