Vibration question - HCS Snowmobile Forums

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Old 02-19-2018, 09:22 AM   #1 (permalink)
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Default Vibration question

I picked up a modded 13' turbo. On my first ride I noticed a slight vibration on the foot boards. And I little more on the left foot. Yes, I know, could be the drive bearings. I changed the jack shaft bearings and checked the track bearings. All good. The only reason I didn't look at the drive shaft bearings is because the previous owner recently installed an anti ratcheting drive and said the bearings were good.

So my question... I feel the vibration might be from my loud 3" exhaust OR from my anti ratcheting drives. Anyone have experience with this??

I sort of felt the vibration more when I was revving it up, louder exhaust. But when I do that I am also driving faster. And I was thinking that the anti ratcheting drives must cause more friction at the track and could cause a vibration.

Thanks in advance for all the suggestions!
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Old 02-19-2018, 09:28 AM   #2 (permalink)
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Quote:
Originally Posted by Katch_me View Post
I picked up a modded 13' turbo. On my first ride I noticed a slight vibration on the foot boards. And I little more on the left foot. Yes, I know, could be the drive bearings. I changed the jack shaft bearings and checked the track bearings. All good. The only reason I didn't look at the drive shaft bearings is because the previous owner recently installed an anti ratcheting drive and said the bearings were good.

So my question... I feel the vibration might be from my loud 3" exhaust OR from my anti ratcheting drives. Anyone have experience with this??

I sort of felt the vibration more when I was revving it up, louder exhaust. But when I do that I am also driving faster. And I was thinking that the anti ratcheting drives must cause more friction at the track and could cause a vibration.

Thanks in advance for all the suggestions!
check your drive belt to see if there is a burn mark in it, that will cause a driveline vibration for sure. RW
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Old 02-19-2018, 09:54 AM   #3 (permalink)
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Check the placement of the studs in your track, may be under the idler wheels. Also, retorque the studs to make sure the heads are pulled down as flush as possible. snap
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Old 02-19-2018, 11:56 AM   #4 (permalink)
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Worn out secondary can cause vibration you can feel in your feet.
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Old 02-19-2018, 03:14 PM   #5 (permalink)
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2nd that worn secondary (STM's tuner's were rather quickly if you have one of those)

Also bent drive shaft OR dented/deflected drivers from hitting a rock just right
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Old 02-19-2018, 03:17 PM   #6 (permalink)
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A couple of questions.
1) What's on it for a track?
2) Does it happen right away or after a short ride?
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Old 02-19-2018, 04:37 PM   #7 (permalink)
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Originally Posted by snappydave View Post
Check the placement of the studs in your track, may be under the idler wheels. Also, retorque the studs to make sure the heads are pulled down as flush as possible. snap
I didn’t think about that. I don’t have the sled now to check. I do know that the track was replaced last year. I don’t know what kind of track. I noticed that under the idler wheels are bumps/ridges in the track. Not like the stock track. That could explain what you are talking about

Last edited by Katch_me; 02-19-2018 at 08:45 PM.
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Old 02-19-2018, 04:39 PM   #8 (permalink)
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Originally Posted by tcat100 View Post
2nd that worn secondary (STM's tuner's were rather quickly if you have one of those)

Also bent drive shaft OR dented/deflected drivers from hitting a rock just right
The secondary seems fine. Although a couple of fins on the back side are damaged from hitting an engine mount bolt that backed out.

Last edited by Katch_me; 02-19-2018 at 08:45 PM.
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Old 02-19-2018, 04:42 PM   #9 (permalink)
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Quote:
Originally Posted by canoehead View Post
A couple of questions.
1) What's on it for a track?
2) Does it happen right away or after a short ride?
1) donít know. Not stock. Iíll post a pic.
2) it is constant. More noticeable when on the throttle.
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Old 02-19-2018, 10:00 PM   #10 (permalink)
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Quote:
Originally Posted by Katch_me View Post
1) donít know. Not stock. Iíll post a pic.
2) it is constant. More noticeable when on the throttle.
probably a bent drive shaft
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