Problems after front sprocket change on 696?

[BaZgA]

Hi

I change front sprocket on my 696 yesterday to 14th AFAM one.
First to say that it was not an easy job because I had to remove that clutch cylinder and footrest so that the sprocket could slide. I hope that sliding that clutch cylinder from the rod couldn't do any damage. It works now but I would not want to find out that I shouldn't touch it when doing 100 mph 

Now we come to the problem. When I assamble it all and start bike I put it in the first gear to see is everything is OK. Bike was on the rear stand and I released clutch and left it to spin on idle. Suddenly chain started to jump, spinning not so fluidly, with intervals of such hard "jumps" that it shake all bike.
When I raised speed it was OK and was spinning OK but on smaller speeds it shakes all bike.
I thought that it hits that chain guide plastic on swingarm so i used dremel tool to cut that plastic "hill" that guides chain. Problem continued so I took of that chain guide. Now I was 100% sure that the problem was not in plastic guide.

Next step was returning the original front sprocket to see will the problem persist and it did.
So the problem was not in the sprocket but in something else. I think in chain but how I dint know. Is it the tension or that it is not lubricated good.
Maybe that is normal when it is on idle in first gear on rear stand but I did not notice that before. It does not look so good at all.

Next thing I am mad about ducati is that they did  not put any kind of marker where to messure chain distance from swingarm. If you messure it half an inch on each side difference is huge so I have to calculate where that spot should be.

One more thing. Is that chain guide plastic really necessary or can I put some duct tape to protect the swingarm of possible chain hit?

TNX in fw

[Ddan]

It's just drive-train lash from the low RPM's.  Ride it.

[Howie]

And replace the chain guide.

[BaZgA]

And replace the chain guide.

Problem is that I don't have usefull chain guide because I cut of that plastic guide on it thinking it makes my problem 
Now I have to order new one but don't know how long it will take to arrive.
Can I drive without it or is it a problem?

[herm]

and put  the 14t sprocket back on

[Slide Panda]

If you did not adjust the chain after installing the 14t the chain will be loose.  You'll want to make sure you re-tension the chain if you go back to the 14t.

A loose chain results in driveline lash as DDDan mentioned.  Your chain is going a little nuts  since it's got too much free room to flop about.  Lash will give you a lurching feeling when the laod on the chain changes - this is especially pronounced in low gears.  Lash also means the chain is flailing about some and it's probably hitting your swing arm in other spots too.

Now we come to the problem. When I assamble it all and start bike I put it in the first gear to see is everything is OK. Bike was on the rear stand and I released clutch and left it to spin on idle. Suddenly chain started to jump, spinning not so fluidly, with intervals of such hard "jumps" that it shake all bike.
When I raised speed it was OK and was spinning OK but on smaller speeds it shakes all bike.
I thought that it hits that chain guide plastic on swingarm so i used dremel tool to cut that plastic "hill" that guides chain. Problem continued so I took of that chain guide. Now I was 100% sure that the problem was not in plastic guide.

Ok there's some problems here too.  Running the bike in gear, on a stand at idle - even if the chain tension was right will see herking and jerking.  It was probably worse due to chain slop.. but it could happen regardless.

Also, your bikes geometry is a bit off when on a stand - you're not on it.  So there's less load on the suspension.  When you're on the bike, the swing arm angle changes, putting the rear axle close to inline with the engine output shaft giving more clearance around that chain guard.

[Speeddog]

Did you put the sprocket on correctly, IE flat side away the motor?

[JBubble]

Did you put the sprocket on correctly, IE flat side away the motor?

*groan*

To the OP, definitely be careful to put the sprocket back on correctly, like speeddog says. It can cause a lot of damage if its put on backwards. Trust me.

[Slide Panda]

Do tell us about it Jbub 

[BaZgA]

Yes I did put it like it was (flat side out) and did chain adjustment afterward but the problem persits.
Now I see it is not a problem but a usual thing doing idle in first on rear stand.