Sprag Gear issue

[He Man]

I am in Ohio on my journey with limited access to tools and need some help with a starting issue.

My bike : 32,680 miles
Ducati S2R1000

Problem :
will not start. No spark

Diagnosis :
I test the spark plugs, no spark on any of them. The pickups cannot be all bad, so i checked the timing sensor. Once removed, i cranked the engine and notice the starer gear does not start. However the clutch will spin. and the pistons are turning over.

My question is, will the clutch and engine turn over from a damaged sprag gear?  i am pulling the cases as we speak.

[Ddan]

If the motor is cranking the sprag is good

[He Man]

Great, because i split the cases and i came to the conclusion that the sprag was good by visual inspection.

So heres an update:

I have never split the cases on this bike and touched the left side of the bike.
Here are my findings:

I removed the left side case and noticed that the flywheel was still attatched to my case cover. It is not suppose to be attatched my case cover, but rather it should be locked onto the crankshaft.

When opening i found that flywheel securing nut was floppign all over the place. so the nut had backed up and the flywheel was just barely hanging on.

The nut has since stripped beyond repair and the threads on teh crank still appear to be good. the first thread is short of mashed up, but im sure it will catch.

here are the pictures.

WHen i pulled of the case, this is what i saw. the flywheel should be on that crankshaft!\


This is the crank shaft


This is the alternator, Im not sure where the metal shavings came from. I think its from the bolts. You can see that they have been sheared and grinded off. i cant tell what did that exactly.

[He Man]

And atop of it all. i just realize i have to admit fault to this.

WHen my clutch basket came off. i think there was enough torque to have backed this nut out. i never put 2 and 2 together until now.

So, i only have myself to blame.

the issue is where can i get this nut?
does anyone have one so i could have it shipped.

[Monsterlover]

I have a nut from an injected 900. Should be the same.

How can I get it to you?

[ducpainter]

I have a nut from an injected 900. Should be the same.

How can I get it to you?

Send him some red loctite in the box.

[Monsterlover]

Send him some red loctite in the box.

Yeah I thought of that too

[He Man]

seriously!


Now i just need to run this through to you guys.

The stater gear is working, it spins the flywheel and the sprag gear is good because it spins the stator hub.

through this process, the crank shaft is spinning. But the timing gear is not spinning. the tiing gear powers the timing belts as well, so was i just super lucky for the bike to have failed without bending any valves?

[ducpainter]

seriously!


Now i just need to run this through to you guys.

The stater gear is working, it spins the flywheel and the sprag gear is good because it spins the stator hub.

through this process, the crank shaft is spinning. But the timing gear is not spinning. the tiing gear powers the timing belts as well, so was i just super lucky for the bike to have failed without bending any valves?

Hopefully...

[He Man]

i guess theres no way to tell if the valves are bent or not?

[ducpainter]

i guess theres no way to tell if the valves are bent or not?

Leak down test...

compression test if there's no way to do the leak down.

Just make sure the layshaft is correctly timed before you button things up and start it.

[He Man]

no way to do a leak down test , a compression test, yest, but i would have to lift the rear wheel to turn the pistons.

right now the issue is timing. i can line up the timing for the layshaft, but that doenst mean that the pistons are at the right timing. the stator hub doesnt have mark on it anymore, atleast i cant find it, im pretty sure it grinded off. but if the belts are lined up for timing and the layshaft is lined up for timing, i should be good to go right?

[Howie]

WOW!  Sorry to hear this.

I'm having a hard time following this, probably due to terminology.  The stator is the winding with three wires coming out of it that is (or was) attached to the side cover.  The flywheel is the big, heavy piece that is (or was) attached to the crankshaft with the big nut.  I assume the flywheel is what came loose.  There is a lump on the flywheel. When the lump passes the ignition pick up spark is created.   The flywheel must be put back in the right position for spark to happen at the right time.

I'm also confused as to what you mean by the timing gear.  I can't think of a reason why the timing sprockets on the crankshaft would not be spinning with the crank if the flywheel comes loose.  The sprockets are mated to the shaft with woodruff keys.  These would have to be sheared. 

Do you have internet access so you can see the manuals on your website?

When you get the bike back together turn the engine over by hand.   If you use the back wheel be gentle.  Your back wheel plus the gearing really increases your force you are applying.

Keep us posted.

[He Man]

Yes, the flywheel did come loose and it started spinning into the case and the case took some damage, however it isnt significant enough to make it unusable.

this is what im using as far as terminology. im at metallimonsters home (by the way this guy is a great host and has been extremely patient with me so far and has done more than i can imagine to help me through this). i was lucky enough to remember that the manual i have for my bike is on my server and downloaded it. ive been staring at it for the past 8 hours.



the woodruff was not sheared (though ti moves around around and that appears to be normal). The woodruff is the only thing that holds the timing sprocket to the crank shaft. otherwise it wouldnt move.

ill try to snap more pics after breakfast.

[ducpainter]

When you get a nut the crank/cam timing will be fine.

Just verify that the layshaft mark lines up when the horizontal cyl is at tdc.

You can do that with a screw driver in the plug hole.