Broken drive belt...again

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Apr 1, 2024 | 12:01 AM

#21

Soulz76

6th Gear

Joined: Jun 2022

Posts: 14

Likes: 1

From: West Plains Mo

I've broke 3 belts less than 200 miles if that on em!?? I have a 02 Softail Night Train fxstb

Quote:

Originally Posted by Bluehighways

How about four pictures of the broken belt.

Up close so we can see the break. One of the top, one of the bottom and one of each side of the belt.

This is the 2nd belt

This is 3rd most recent like last week only had mabey total of 100 miles on it , they all looked the same way when they broke as the pictures kinda see ! Whys this happing? Please help

Apr 1, 2024 | 10:27 AM

#22

foxtrapper

HDF Community Team

Joined: Nov 2012

Posts: 6,190

Likes: 2,419

From: USA

@Soulz76 , your first picture seems to show a bulging in the center of the belt, like a good sized rock was trapped between it and the sprocket, leading to a partial rupturing of the belt.

The second picture seems to show very few cords, making me suspect this was a weak aftermarket replacement belt that failed under the work load.

Apr 1, 2024 | 10:42 AM

#23

jake24lt

Stellar HDF Member

Joined: Jan 2017

Posts: 2,678

Likes: 2,081

From: Massachusetts

This from the manufacturer

Zhejiang JOMO Timing belt Co., Ltd.

No. 305, Zhuxi Road, Zhu'ao Town, Sanmen County, Taizhou City, Zhejiang Province, China

Apr 1, 2024 | 12:49 PM

#24

hattitude

Seasoned HDF Member

Joined: Sep 2008

Posts: 14,156

Likes: 11,247

From: San Diego, CA

Quote:

Originally Posted by foxtrapper

Quote:

Originally Posted by jake24lt

This from the manufacturer

Zhejiang JOMO Timing belt Co., Ltd.

No. 305, Zhuxi Road, Zhu'ao Town, Sanmen County, Taizhou City, Zhejiang Province,China

I suspect the above posts expose a big part of your issue....

Weak belts exaggerate the effects of minor issues on belt longevity...

Apr 1, 2024 | 02:14 PM

#25

Rufus13

Road Captain

Joined: Jul 2023

Posts: 523

Likes: 405

From: So Western Ohio

Op never answered the belt guard question. There is a good reason for that lower guard.

Apr 1, 2024 | 02:59 PM

#26

foxtrapper

HDF Community Team

Joined: Nov 2012

Posts: 6,190

Likes: 2,419

From: USA

Quote:

Originally Posted by Rufus13

Op never answered the belt guard question. There is a good reason for that lower guard.

The OP is from 2012, that’s long gone.

The thread was revived by another with their own belt breakage troubles.

Apr 1, 2024 | 04:03 PM

#27

Rufus13

Road Captain

Joined: Jul 2023

Posts: 523

Likes: 405

From: So Western Ohio

Quote:

Originally Posted by foxtrapper

The OP is from 2012, that’s long gone.

The thread was revived by another with their own belt breakage troubles.

Back in 2001 I was a member of a Road Star forum. Big, air cooled V twins with drive belts. Those that removed the lower guards had a much higher chance of picking up a rock that would shred a belt in two seconds.
I doubt .025" run-out would rip a properly tensioned belt in half.

Last edited by Rufus13; Apr 1, 2024 at 04:04 PM.

Jun 19, 2024 | 01:14 PM

#28

Marijuanamikel

3rd Gear

Joined: Jul 2018

Posts: 7

Likes: 0

From: Hamilton

Hi does any one know if a 140 tooth belt will fit my 07 ultra with a 32 t front pulley and a 70 t rear pulley stock is usually 32 t front pulley and 66 t rear pulley with 137 belt Any help appreciated thanks