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696 Shop Manual Error---Chain Tension

8K views 3 replies 3 participants last post by  daviejones  
#1 ·
Well, perhaps not an error so much as an incomplete translation.

The first thing I noticed after I purchased a slightly used 2009 Monster 696 was that the chain seemed to be too slack. The bike didn't come with a manual so (thanks to this forum) I located and downloaded both the Monster 696 Owners Manual and the digital version of what passes for a Monster 696 Shop Manual (kinda' thin).

They both address setting the chain tension. In addition I searched around on the Internet and was surprised to see how many different opinions (some good and some not so good) there are about measuring and properly setting the chain tension. These range from "don't worry about it" to "just eye-ball it" to "First buy a $5000 laser". I found more than a few misunderstandings.

The English version of the owners manual and both the "British" and "American" versions of the shop manual say much the same thing. That is roll the bike to find any potential tight spots, pull down on the chain with your finger, and measure the distance from the center of a chain link pin to a point on the swing arm halfway between the two sprockets.

OK, but what about that finger pull?

When I got to adjusting my chain the first thing I wondered about is whether of not I'm supposed to keep pulling with my finger while I measure or should I release the chain and then measure. No hint from anything I could find in English.

A year ago I moved to Italy and I'm all too familiar with bad translations so I checked the Italian version of the digital shop manual.

Sure enough, the Italian version is identical to the English versions with the addition of one important phrase. In Italian it instructs you to RELEASE YOUR FINGER PULL AND THEN MEASURE THE CHAIN SLACK. Ah ha! The truth comes out.

This reminds me of my recent Italian drivers license test where the English version says "..... broken white stripe..." and in Italian it says "...striscia bianca continua..." which means CONTINUOUS; big difference.

If you're not all that interested in mechanics in general or your bike in particular this might seem like trivia. But to to me this was a comforting piece of information. I hope it helps someone else.

By the way, the socket which fits my rear axle nut measures exactly 47mm in height so it's a very handy gauge; much better than a tape measure. Check yours.
 
#2 ·
I don't get it. This might make sense if the top run had slack in it and you wanted to take that up before measuring the deflection. However, the top run is usually fairly taut after having been pulled by the drive sprocket. Ergo, if you pull the chain down and then release it, it returns pretty much to where it was. Ergo, why pull it?

After riding these beasts for 40years, I can tell a tight or loose chain by feel. I have the same 2009 696 and in my opinion, if you measure the full deflection of the chain and set it to book specs, it appears a tad tight to me.

Ron
 
#3 ·
I don't doubt your word about having a feel for chain tension; however, Ducati must assume that the Monster will be sold to people who are not only first time bike owners, but folks who would be challenged by changing a faucet washer.

So, the "push up on the middle of the lower chain run" advice is to make sure that the slack is taken out of the upper run of the chain because "usually" may be good enough for you but perhaps not for the beginner.

Someone else asked "Why measure the tension using the side stand". Of course the answer is because everyone has one. Not everyone has a paddock stand or whatever else might be required if the Ducati-recommended procedure were somehow different for whatever reason.

The point I was trying to make is that the English version of the printed procedure doesn't specify to release the chain before you pull it or to keep pulling down during the measurement; there's a considerable difference in the end result. If you set 47mm, plus or minus one, while you continue to pull down on the chain, it will indeed be too tight. I've read numerous references to measuring the chain while continuing to pull down on it and that error is understandable given the vague instructions contained in the English version. Perhaps a French and/or Spanish reader could chime in here and reveal what those versions say about the subject.

In any case, the Italian version specifically says to release the chain and THEN make the measurement. This is important if correct chain tension is to be achieved using the Ducati method. That little difference between the English and Italian version is the focus of my post and I imagine you would agree that using the wrong method would lead to incorrect chain tension.

I think the beginner might have a strong desire to set the "book specs", but first it's important to understand what those specs are and how to achieve them. I think we can all agree on that. Most old hands I know like to know the book specs too, even if they use some other method based on their experience. I have no problem with that.

By the way, when I have my 696 chain set to what I believe are factory specs, if I push up on the chain just under the aft end of forward lower rub strip (considerably forward of the chain mid point) using moderate-to-strong pressure using one thumb, the chain almost touches the rub strip. With a strong jerk, I can make it barely touch. This is with the bike on the side stand with no weight on the bike. Does that agree with what you get when you adjust by "feel"?