750 Paso Bad news (Death???)

RADDUCK · Post by **RADDUCK** » Thu Sep 20, 2007 12:10 am

Hello All,

I bought this bike 2months ago and with your help, had just finished changing all the fluids, mounting new tires, brake pads, chain alignment, belts, valves, plugs, cleaning the webber, fuel lines ect.

I think the tranny on the Ducati blew up. I hauled the damn bike 1,600 miles north for a chance to ride it through oregon and spend some time in Eugene and Portland. It was to be our vacation with in a vacation aboard a classic piece of Italian Iron. We made it 45 miles from the beach house before tragedy struck.

A big bang/clunk followed by a chorous of grinding sounds like a marble in a blender. I had just passed a fully loaded logging truck and signaled back in when it hit. I pulled in the clutch and coasted onto the median. The motor still idled nicely but things didn't sound good down below.

It's now back on the trailer due to be hauled back to Mammoth. It's a beautiful machine but I'm scared to hear what Tony will quote me on the reserection.

When I rolled to a stop. I could see that the chain was sagging full of slack so I pulled the chain and sprockets the front countershaft sprocket was no longer centered, the seal bent, and no sign of a bearing on the inside supporting it. I imagine the countershaft bering disintegrated. Has this what happened to anyone else's paso? Can just the transmission be replaced or does this involve splitting the cases. I would imagine a motor swap would be the easiest and least expensive solution. Your thoughts and suggestions?

I'm the 3rd owner, The guy I got it from races motorcross professionally and maintains all of his own machines. He's anal, he wins, and I checked the chain tension and alignment when doing my usual maintenance. The bike had 19, 925miles on it. He said he had replaced the chain and both sprockets and that he though it was strange that the front sprocket was missing two teeth. I rode it about 500 miles before doing any of the major maintenance listed above. Not that it matters at this point but I'm wondering if the orignal owner could have run the chain too tight and stressed the bearing?

Thanks, Gunther

mach5er · Post by **mach5er** » Thu Sep 20, 2007 1:32 am

Same exact thing happen to me with an engine I bought off ebay. I rode 10 miles after I installed it and thats all I got out of it. Same countershaft problem you described. I just ended up doing an engine swap as a fix. I still have the broken engine in the garage. So I am curious what replies we hear in this thread...

Post by **jcslocum** » Thu Sep 20, 2007 2:17 am

Chain too tight is the root cause. Happened to me too

Tamburinifan · Post by **Tamburinifan** » Thu Sep 20, 2007 9:58 am

Read about tight chains ruining bearings.
And the case... :ugh:

Desmo_Demon · Post by **Desmo_Demon** » Thu Sep 20, 2007 12:18 pm

I know where two engines are....one with a hole knocked in the case from a broken chain, one in perfect condition (as I was told). Send me a PM if you are interested in either of them (one is in the Boone, NC area and the other is near Atlanta).

Desmo_Demon · Post by **Desmo_Demon** » Fri Sep 21, 2007 4:44 pm

This complete engine just showed up on eBay....

http://cgi.ebay.com/ebaymotors/DUCATI-7 ... dZViewItem

Finnpaso · Post by **Finnpaso** » Fri Sep 21, 2007 6:56 pm

Tamburinifan wrote:Read about tight chains ruining bearings.
And the case... :ugh:

JUST SO !!!!!

AND worst is, that, if need to change that output shaft bearing, it needs to open hole engine(open cases)!!!

RADDUCK · Post by **RADDUCK** » Fri Sep 21, 2007 9:39 pm

Being my bike that suffered the aformentioned catastrophy I wanted to check with you guys about proper chain tension. When I set it up I had the girlfriend sit on the passenger seat and bounce up and down... Yes it was exciting to watch. I supported the bike while feeling the chain tension. I tested it about a little forward of 1/2 way between the front and rear sprockets. It had some tension and I adjusted it so that it had 1/2" to 3/4" play when pressed up or down firmly with my fingers. It wasn't a sloppy 1/2" to 3/4." I noticed the inside side of the chain was occasionally rubbing on the verticle cylinder's exhaust header pipe. The fact that the guy I bought it from (2nd owner) said the front sprocket was missing two teeth when he replaced the chain, and sprockets would lead me to believe the 1st owner may have run the chain too tight. I checked alignment of both while I was there. It did not appear as though the chain was ridding correctly on the nylon slider/guide thing on the top of the swing arm.

So what is your chain adjustment proceedure?
Anyone else find missing teeth on a front sprcket?

Finnpaso · Post by **Finnpaso** » Sat Sep 22, 2007 9:36 am

I have followed owners manual notes in both 750 Paso and 907IE and never any bearing problems.

750 Paso side 98.
907 Paso side 84.

Method is litle different explaned in those cases.

I have also never lost any teeths from front sprockets. Normally i change both rear and front sprockets, when i change chain and in middle of chain/rear sprockt life i change front sprocket, so i use 2 front sprockets in lifetime of chain and rear sprocket.

ducapaso · Post by **ducapaso** » Sun Sep 23, 2007 6:39 am

RADDUCK wrote:When I set it up I had the girlfriend sit on the passenger seat and bounce up and down... Yes it was exciting to watch.

Was she wearing an upskirt? :lick:

persempre907 · Post by **persempre907** » Sun Sep 23, 2007 4:57 pm

Nicola,
take care how you write.
Here the PORN is an obsession...
:funny: :funny: :funny: :funny: :funny: :funny: :funny: :funny: :funny: :funny: :funny: :funny: :funny: :funny:

Ciao

Finnpaso · Post by **Finnpaso** » Sun Sep 23, 2007 6:22 pm

Is very short skirt porn ? :lick:

persempre907 · Post by **persempre907** » Sun Sep 23, 2007 10:14 pm

Finnpaso wrote:Is very short skirt porn ? :lick:

...as I told you...
Ciao

Post by **jcslocum** » Mon Sep 24, 2007 11:58 am

You guys are such Pu*sy hounds!!!!!!

Next you'll be asking for pictures of his GF :-)

What a group.....

ducapaso · Post by **ducapaso** » Mon Sep 24, 2007 3:59 pm

Finnpaso wrote:Is very short skirt porn ? :lick:

as a matter of fact, it depends of the shorts

:laugh: :funny: :funny: :funny:

750 Paso Bad news (Death???)

750 Paso Bad news (Death???)

Proper chain tension?

Re: Proper chain tension?