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Discussion Starter · #1 ·
Hi All sorry to be thick but can some one explain to me the process in chain tension. I have a 939SP 2017 and in the book all it says is A should = 68mm/70mm but without being stupid what is the answer I just don't get it all I wanted to know is for example should it have 50mm tolerance or something as 68/70 is 0.9714
I would very appreciate so help please and than you
Cheers Marcus :smile2:
 

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Hi All sorry to be thick but can some one explain to me the process in chain tension. I have a 939SP 2017 and in the book all it says is A should = 68mm/70mm but without being stupid what is the answer I just don't get it all I wanted to know is for example should it have 50mm tolerance or something as 68/70 is 0.9714
I would very appreciate so help please and than you
Cheers Marcus :smile2:
There should be a 68-70mm distance from the swingarm to the center of a chain rivet, halfway between the two sprockets.
 

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Discussion Starter · #3 ·
Big Ta

Hi

Thanks so much I thought that but in my hand book it said 68 divided by 70 and this through me much appreciated M
 

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Hi

Thanks so much I thought that but in my hand book it said 68 divided by 70 and this through me much appreciated M
It is a frame of reference 68 to 70 mm not divided by, I have the manual in front of me I see what your seeing. I have adjusted mine many times that range is to account for human error, differences in measuring tools etc. They show you where to measure from as well.
 

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Do it with the bike on the sidestand. A quick and dirty check is to see if the chain hits the swingarm when you push it up while the bike is on the sidestand. Should stop just before that.
 

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Just refreshing this thread:

Attachments of relevant owners manual and service manual pages.

Links to chain adjustment tool and chain lube options.

The swingarm sticker has 69-71 mm while the manual says 65-67. I used 71 mm when I adjusted today.

The 71 mm was measured on a rear stand using the chain tension inspection method as per the manual, pull chain down mid length, release and measure.

On the bike's side stand, the manual recommended position for checking tension, I got 75 mm. Prior to tightening I was at 85mm on the sidestand.


https://www.amazon.com/MotoMfg-adjuster-Ducati-MTS1200-Diavel/dp/B074D2RYC1

https://www.amazon.com/DuPont-Teflon-Chain-Saver-Self-Cleaning-Lubricant/dp/B00KMMFE8Y
 

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A helpful tool kit if you’re going to get one...
 
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Just refreshing this thread:

Attachments of relevant owners manual and service manual pages.

Links to chain adjustment tool and chain lube options.

The swingarm sticker has 69-71 mm while the manual says 65-67. I used 71 mm when I adjusted today.

The 71 mm was measured on a rear stand using the chain tension inspection method as per the manual, pull chain down mid length, release and measure.

On the bike's side stand, the manual recommended position for checking tension, I got 75 mm. Prior to tightening I was at 85mm on the sidestand.


https://www.amazon.com/MotoMfg-adjuster-Ducati-MTS1200-Diavel/dp/B074D2RYC1

https://www.amazon.com/DuPont-Teflon-Chain-Saver-Self-Cleaning-Lubricant/dp/B00KMMFE8Y
4500 miles and I had to take some slack out of the chain today. Was at close to 80mm had to increase tension to bring it back to 70mm. Took 5 minutes on the side stand. One of the great benefits of the single sided swing arm!
 
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