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 Post subject: Ducati belt engines - a nasty secret flaw?
PostPosted: Wed Mar 18, 2020 9:56 am 
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Joined: Wed Sep 25, 2019 6:37 am
Posts: 22
Location: Australia
model: 906 Paso
year: 1989
I know of three instances of chains breaking on Ducati belt drive engines.
One was a Pantah and two were Pasos.
The result of each of these failures was a smashed crankcase near the drive sprocket, in every case caused by the plastic protector for the swing arm becoming dislodged and going straight between the chain and sprocket teeth. There is not enough room to accommodate the chain as it is lifted off the sprocket, which is what happens. The chain breaks through to the inside of the crankcase, near the gear selector mechanism. In doing so, the chain was broken and tried to wrap around the sprocket, cutting grooves into the swingarm pivot, which is also close to the sprocket.
The protectors are secured by one bolt/nut. They evidently can become distressed in use, to the point that they can break away from the single attachment point.
The new replacement protector for the '89 906 I'm working on is secured in the usual way, but in addition a polyurethane adhesive (tough stuff) was applied between the flat bottom surface and the top of the swingarm, and should help prevent problems in future.
Perhaps more recent models don't have this weakness?


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 Post subject: Re: Ducati belt engines - a nasty secret flaw?
PostPosted: Wed Mar 18, 2020 10:17 am 
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paso grand pooh-bah
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Joined: Thu Nov 03, 2011 10:13 am
Posts: 695
Location: Scotland
model: 907 I.E.
year: 1994
Thanks for the tip. I'll keep an eye on mine.

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1994 907ie
2017 Supersport 939
2015 Scrambler Classic
1982 Pantah 500SL


Scotland


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