Tight spot on new sprockets and chain?!? - MVAgusta.net
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post #1 of 25 (permalink) Old 04-13-2019, 02:58 PM Thread Starter
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Angry Tight spot on new sprockets and chain?!?

Hi All,

My chain and sprocket change seemed successful expect one thing…

There is a variation in the chain slack when I rotate my wheel. (A tight spot)

I have scoured the manual and forum for some indication of what would be considered acceptable but the manual just says “virtually the same” referring to the 112mm measurment.

I didn’t expect any tight spots on a brand new chain and sprockets so I tensioned it without checking for any! Now I’m concerned I could have ran it tight and worsened it/caused damage! I re-adjusted the tension as soon as I realised there was a tight spot after about a 7 mile ride.

I attach links to images below next to my 112mm cardboard cut out. The discrepancy is about 8mm from tightest to loosest section.

Im not convinced its just the chain as the same link can have difference variations depending on which revolution it appears when checking.

- Is this within tolerance for a new chain and sprockets?
- If not, what would you suggest?
- Is this just another quirk of this beautiful beast!

Photos attached.

Bike is 2013 Brutale 800 16000 miles.
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post #2 of 25 (permalink) Old 04-13-2019, 04:29 PM
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Some of the 8mm variance will be in the measuring system you've adopted - uncalibrated cardboard . You'd better hope that Noel does not see that......

The Chain will most likely not be the issue.
To properly diagnose a stretched chain I would suggest raising the rear wheel with a stand and using a metal ruler or vernier caliper to take measurements, at least 6 as you rotate the chain through a full revolution.

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post #3 of 25 (permalink) Old 04-13-2019, 04:43 PM
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In one revolution of the wheel how many times does the chain get tight?
If it's only once it's the rear sprocket, 2 1/2 to 3 times it's the front
Measure it like this with a vernier caliper
Is there side or radial play in the cush drive?

It's a new chain and sprockets Dave
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post #4 of 25 (permalink) Old 04-13-2019, 06:31 PM
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First off, get one of these:

https://smile.amazon.com/Mitutoyo-18...gateway&sr=8-4

112mm is ~4.5".

Knurl's advice is spot on. Except use a dial caliper like he has. The Venier caliper went out with the slide-rule.

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post #5 of 25 (permalink) Old 04-13-2019, 11:37 PM
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Quote:
Originally Posted by Mario Landavoz View Post
The Venier caliper went out with the slide-rule.
It's funny you should say that because Noel once went out with Marlene Dietrich.

And I have no idea what a Venier caliber is but I assume it outperforms cardboard.
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post #6 of 25 (permalink) Old 04-14-2019, 06:53 AM
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Now I am curious....

The manual shows a 116mm dimension for chain adjustment in the manual for an 800 Brutale. MV has been known for manual discrepancies, but I would err to the loose side.

I am also assuming you have the bike vertical on a stand or you have a friend helping.

The chain variance of that much would imply that the rear sprocket has an issue. Either it is installed incorrectly, or it has a manufacturing defect that has it in a non-concentric alignment on the carrier.

Is it a stock sprocket, or did you buy an aftermarket unit? There was one other gentleman in the forum who bought a sprocket that was manufactured incorrectly and it exhibited similar symptoms.

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As for the debate on Venier versus vernier versus dial versus cardboard, as long as you are accurate with the initial measurement, and your execution of rock-scissors-paper is correct, you now have a nice portable tool.

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post #7 of 25 (permalink) Old 04-14-2019, 07:49 AM
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Quote:
Originally Posted by The_castle View Post
It's funny you should say that because Noel once went out with Marlene Dietrich.

And I have no idea what a Venier caliber is but I assume it outperforms cardboard.

Venier scale as applied to calipers: https://en.wikipedia.org/wiki/Vernier_scale


Marlene Dietrich? I didn't know he had a taste for the vintage rides. From his pic' postings I would assume he was into the modern stuff only.
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post #8 of 25 (permalink) Old 04-14-2019, 07:56 AM
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Quote:
Originally Posted by Mario Landavoz View Post
Venier scale as applied to calipers: https://en.wikipedia.org/wiki/Vernier_scale


Marlene Dietrich? I didn't know he had a taste for the vintage rides. From his pic' postings I would assume he was into the modern stuff only.
Um....

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post #9 of 25 (permalink) Old 04-14-2019, 11:52 AM
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Did you get the correct pitch master link? I would specifically measure the master link or check its stamping for pitch and make sure its the same as the rest of the chain. I'd do what the others are saying though since you also say the same link will show a different amount of slack on a different rotation.
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post #10 of 25 (permalink) Old 04-14-2019, 05:46 PM
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Quote:
Originally Posted by airjawed View Post
Did you get the correct pitch master link? I would specifically measure the master link or check its stamping for pitch
WTF???
The pitches vary by 1/8"......
With the wrong master link the chain won't even go on the sprocket

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