Eccentric adjuster 180 degree out?
 

Someone help me!

Having a problem with my adjuster on my 996r.

A few weeks ago I got some track day bodywork (Barrys) and on fitting it I noticed the rear of the bellypan was very close to the rear tyre. It actually only had a few mm clearance. I noticed the gap on Lilys bike was much larger and her and JPM very kindly came round and helped me get it somewhere near right. Actually Lily did all the work and me and Jon stood round talking. Had a few test runs on the bike and no problems with fouling even though the pan was still very close to the rear tyre.

Yesterday I had another test ride and everything seemed fine until I noticed the exhaust where it curves down from the rear cylinder (near the forwardmost part of the rear tyre) was highly polished where the tyre had been making very light contact. Obviously not supposed to happen.

Got plenty of info of here and Ducati Oop North re the eccentric adjuster. The main info was that the eccentric should be at around 4 or 5 oclock in the swinging arm with the chain at correct tension. Now I have slackened of the pinch bolts and slackened and removed chain from rear sprocket. And it is possible to get the eccentric in the 4/5 oclock position but not with the chain on the sprocket. I must point out I have standard sprockets and chain with the correct (94) amount of links in place.

It seem to me that its impossible to get a full revolution of the adjuster as when you get so far the caliper plate goes up tight against the locating pin on the wheel side of the swinging arm stopping full 360 degree movement.

Is it possible that at some point the eccentric bearing holder assembly has been removed and replaced 180 degrees out? I've been scratching my head for the past hour or so and then realised that when playing with the adjuster that to tighten the chain I was having to turn the adjuster clockwise (viewed from sprocket side) and not anticlockwise to tighten the chain.

Do I just need to remove it all and replace it 180 degrees out?

Am I correct that its wrong or am I talking a load of tosh?

Ps, I have measured ride height before starting so I can reset to what it was later.

Oh well, still struggling to get it sorted. Turned the eccentric far enough so its operating correct way ie anti clockwise to tighten. However with the chain way too tight the clearance between exhaust and rear tyre is still not that big (half worn tyre as well) The eccentric with chain way too tight still only comes to about 6.30 oclock when everyone tells me it should be between 4 and 5 oclock. (looking from sprocket side)

Any ideas anyone? Gonna order a new chain with 96 instead of 94 links in the morning as I cant think of what else to do.

Thanks to Nelly for the quick chat earlier. I know youre busy and I appreciate the time you took to answer my queries. I did loosen all the exhaust system but couldnt get it any further away from the tyre.

Hope you find the answer Martin, I have a similar problem,mines about 6.30, and I'm just about to fit a belly pan.

Thanks, if it wasnt for the fact I fitted Barrys bodywork this problem wouldnt have come to light. The Bellypan is a good inch or so longer and hence further back than the standard carbon one fitted. On fitting the kit it was that close to the rear tyre that if I grabbed hold of and lifted the rear of the bike as the swinging arm dropped the tyre contacted the bellypan. A lot of messing about got the clearance ok where the tyre just missed by about 5mm. It was only on a ride on saturday when I was checking to see if the new bellypan was unscathed that I notice the polished section of the exhaust. Scary thing about it is that it must only be touching at high speed when the tyre grows in diameter with the centrigugal force.

I'm confused as to why its only seemed to be a problem now. The bikes just got 4000 miles on it but the chain must have stretched a little which would mean by adjusting it the rear wheel should be further rearward than standard and also there a few mm worn from the centre of the rear tyre. So a brand new tyre and standard (94 link) chain would have the rear tyre within a fraction of the exhaust.

You can get the chain tensioned in 2 points of the 360 degree rotation of the eccentric. One is correct at supposedly 4 to 5 oclock and the other is horribly wrong as it cause problems with the lower run of the chain running against the swinging arm and also the tyre will rub the hugger. When I sent JPM a pic the other week of how close the bellypan was he said that to him the wheel looked too far forward and close to the exhaust as well.

Going to order a Tsubaki gold chain with 2 extra links in the morning. Got one for the Multistrada last week and was impressed with the quality. Bit of a pain with those hardened links to fit though.

The bellypan most likely (coming from Barry) will be the Corsa one which uses a longer swinging arm, hence it's closer to rear wheel on a road bike.

I tried to send you a pic of th excentric but the site would not show your email addy , U2 me it and i will email the pic if it would help any ?

Thanks Totto, I already have pics of the eccentric via Haynes manual and something Shazaam posted.

Felix, youre right that the bellypan is the corse one and is a good bit longer than standard. However its probably a good half inch nearer the rear wheel than the identical pan on Lilys bike.

I will see if I can get some pics up showing the exhaust where its been rubbing.

You can see the shiny bit at the horizontal section of the pipe highest up the bike. If that makes sense?

A pic of just how close the bellypan was to wheel.

Martin,

You mentioned you'd had the fork seals done a while ago, did they also set the bike up? maybe they've set this up and it's ended up like this???

Corse swinging arm is around 25mm longer than standard, so it follows that with Corse bodywork everything is gonna be that bit tighter.

Could be if you remove chain by fully slackening and sliding it off both sprockets that you can get the eccentric in the fight position and start again so to speak.

I can get the eccentric in the right position but not with the chain on the sprocket. Am just about to ring for a new longer chain I fancied a nice gold one anyway! Honestly though I have tried and tried to get some sense out of it and cant. Its almost as if my chain has shrunk! Maybe fitting a 180 rear has made the problem more noticible than when I got the bike with a half worn 190 on.

JPM, when I had the fork seals done as far as I know he did nowt else to the bike. I've never been 100% happy with the way the bike felt handling wise since I got it. I never seemed confident in it the way I was with my 996s a few years back. It feels as if the front could wash out when tipping in to bends. Could be down to the rear height being too high as the eccentric is very low down in its chain tensioned position.

There are only 2 positions the eccentric can be in to have the chain at correct tension. One is horribly wrong as it causes the chain to be hard against the lower swinging arm and also the wheel to rub on the hugger. And the other is the right one. When in the correct position the action of tensioning the chain actually decreases ride height as the eccentric is going anticlockwise from the 5 oclock ish position.

I cannot see any other way but fitting a longer chain. I'm hoping an extra 2 links will be enough? Suppose it makes sense that 2 extra links will lengthen the wheelbase by the amount of 1 link of chain. Wondered about 4 extra but that might mean that after the chain has stretched a little there would not be enough movement left in the adjuster to take up tension? Then I would have to fit a bigger rear sprocket to compensate. Which might not be a bad idea!

Martin

Have you sorted out the sag at the front yet?

A 180/55 is about 10mm taller than a 190/50 Martin.

Yes I'm on a diet and have stopped wearing tight T shirts!

Surely not 10mm? I work out that 55% of 180 is 99mm and 50% of 190 is 95mm. Meaning the 180 is 4 mm more in radius. I have ordered a chain with a couple of extra links which will move wheel back by the distance of 1 link which will be enough. Almost got carried away and got renthal carrier and rear sprocket up 3 teeth with an even longer chain (+4 links). Bought a 14 tooth sprocket as well but may fit that to the Multi. I broke a Breaker bar the other day trying to undo rear sprocket nut and took it back to Halfords today. I tried to claim I had bought it recently but lost the receipt. Shop guy raised an eyebrow as he informed me they had not sold that model bar for a few years! I actually bought it about 5 years ago. He didnt have any in stock but told me to call in on Friday and he would have one waiting for me FOC. Excellent.

Serious answer to your question. I did find the piece of paper I was looking for when you were here. I had written the measurements I had taken when I adjusted everything back in winter.

I have static sag as Front 30mm and rear 10mm

And with me on the bike Front 45 and rear 40mm

To be honest I cant actually remember if these are the settings I was aiming for or the ones I actually had!? Bikes in bits at the moment waiting for Tsubaki gold chain to arrive in the morning. When I get it back in one piece I will have a go with the sag again. I will probably need a firmer rear spring in the future though. It would be nice to live next to Maxton, probably end up with one of his purple springs on though. I still have a load of his stickers though so I might stick a couple of them on the bike and see if its any better.

you need this chart mate

http://www.ducatisportingclub.com/sh...ains+sprockets


age

Thanks for that its very useful. I did find something similar but not as well written and set out. Good old Shazaam! One think I noticed that was a little strange and has got me thinking is he has listed a 996r as having a 35 tooth rear sprocket as standard. Mines a 36 which I presumed was standard?

martin, i've just realized I lifted a whole load of stuff on 94/96 link chain from Shazaam off speedzilla ages ago its in upnorth's tech library

http://www.ducati-upnorth.com/tech/gearing.php

so he has but they both run 94 link chains !

Age

I had my track fairing kit on last week and had plenty of clearence!

Do you have a hugger fitted and does tyre run close to it ? if it does then your adjuster is in the wrong position !!!

Age

sorry I usually work on about 10mm for diameter, its not exact as different tyre/rims and tyre profiles /rim widths also affect it. it is 4mm radius which is whats important.

No there is plenty of clearance between tyre and hugger. The adjuster is in the right position working in the right range but just not far enough in that range to get the wheel far enough back when the chains at correct tension. In my tinkering I have had the eccentric far enough round that it works in the other half of its range. ie it then means you have to turn the adjuster clockwise instead of anticlockwise to tighten chain. Its in that wrong position that ride height is massively reduced and tyre touches hugger.

I'm still unsure why Shazaam has rear sprocket listed as 35 teeth when as far as I can see everone else has it at 36 teeth. Of course if it should be 35 and not 36 that will account for a proportion of the shortened wheelbase.

Is your fairing one of Barrys? Am happy with what he sent me and I know theres nothing wrong with it and would recommend his stuff to anyone. It wasnt a case of his fairing didnt fit but more a case of my bike didnt fit his fairing. Its exactly the same stuff as everyone elses but I'm the only one whos had trouble because of my too short wheelbase.