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Old 07-19-2013, 08:49 PM   #76
Jan OP
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Joined: Jan 2006
Location: Dumaguete City, Philipines
Oddometer: 34
Time for an update i suppose...
When i got the bike, it ran like crap.
Changed the ignition system, ran a bit better but still erratic.
Ended up changing the carbs to mikunis.
Ran a whole lot better, but not perfect yet.
Ended up changing the airbox for pod filters and that sorted the erratic running. .


Still idles very badly when cold which i didn't fully understand till a closer inspection revealed there's a pair of 7/c racing cams inside...
That would surely explain the narrow powerband way high in the revs... highly addictive but unusable downtown... so i foresee a cam change in the future... (and a fork/suspension upgrade now the front wheel just hops along whilst heavy braking... . I did install 4 pods brembos that i had laying around... maybe too much braking force for those skinny forks...)

So what i thought was a standard 3cl turns out to be something else...
I wouldn't be surprised if there are high comp pistons inside as well... (anyone have a clue on how to figure that one out - without pulling the head? compression test figures perhaps? )

Will post some pictures later, the italian tramp is at a buddy's now having custom side panels made.
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Old 07-19-2013, 09:13 PM   #77
Vince
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If its got 7c cams odds are its got the hi comp pistons.I would have said picking them by a compression test except maybe those big cams would have an influence.BTW there are lots of not correctly timed cams fitted out there plus the factory spark timing marks need checking..There is a good write up on this at JLOs Laverdapedia site.There are 3 other cams available.C4,thats the Jota ones,Axtals,and the F1 grind from the 120 models rejigger to the 180.The last one is what I have and am really impressed,much stronger than my old correctly indexed A11 just about everywhere.
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Old 07-19-2013, 09:58 PM   #78
Jan OP
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Location: Dumaguete City, Philipines
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ignition timing was checked when installing the new iginition unit.
the cam timing i'll do when i'll change the cams.

yup that's what i figure as well, who would put racing cams with standard pistons? wouldnt make sense...
mind you so far nothing of the DPO's stuff i found on her made any sense...
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Old 07-20-2013, 11:43 AM   #79
G 981
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This one?

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Old 07-26-2013, 08:10 PM   #80
Old Mule
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Location: Chihuahuan Desert in Texas
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thanks!

That's it, I think that is the race shop head driving it, any more where this came from?
I sure would like one of those fine 750 twins in a street sidecar...
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Old 07-26-2013, 10:01 PM   #81
lavrgs
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Location: Two-all-ah-tin, Oregon
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Quote:
Originally Posted by Old Mule View Post
I once saw one photo of a 750 twin sidecar outfit that Pietro Laverda had built for himself at the factory race shop. It was a purpose-built chassis, not a sidecar attached to a bike. It was similar to a racing kneeler, but streetable. I think it was built for hillclimbs and short sprint races.
I would really like to have a photo of it- any Laverda historians here help me out?
There is one in Cor Dees Laverda museum. There is a picture of a racing sidecar on the website http://www.laverdamuseum.nl/index_uk.html
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Old 07-28-2013, 07:41 PM   #82
Old Mule
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sidecar

thank you! I had never seen a photo of that machine with bodywork on, 16 inch wheel sidecars are from my favorite era of racing. I sure would like to build a 750 twin outfit like this but for the street...
maybe someday a crashed and "irrepairable" 750 will appear...

Old Mule screwed with this post 07-28-2013 at 07:51 PM
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