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#Post#: 2985--------------------------------------------------
Falcone engine overhaul - post valve breakage...
By: Sigean Date: May 27, 2025, 7:07 am
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Ciou Falconisti
It's been a long time since I posted on this site. I have been
putting off engaging with the cold reality of my broken Falcone.
It was about 7 years ago when I was riding the Falcone back to
the UK from southern France when disaster struck. On a glorious
summer morning, perhaps proceeding at a little more than the
posted speed limit down an empty road near Moulins, the engine
went "BANG" and I coasted to a stop by the side of the road.
The exhaust valve head had become bored with its attachment to
its stem and had formed a permanent relationship with the
piston. It rather spoiled my day. Hey ho, life is tough and
then you die...
So, after all this time the engine is out of the frame and I can
now survey the extent of the damage. This initial examination
reveals that the piston is shot, the combustion chamber is
scarred (those scars now repaired by a friendly welder, but
needs new guides, valve seats, etc.), and the connecting rod is
slightly twisted. I haven't been able to check the flywheel
yet, that's the next job.
I will buy a new piston (any recommendations?) and have the
(undamaged) cylinder rebored to suit, but I will need a
replacement con-rod. Might any Falconisti out there have one I
could purchase? And when renewing the valves, can anyone advise
on replacement valve options? I know there is a school of
thought regarding the advantages of using lighter valvegear, and
I am attracted to this: can anyone recommend any of the options
available?
Finally - the internal crancase bolt... Mine is super tight.
Apart from applying heat to the aluminium into which it screws,
are there any other removal techniques that have proven
successful?
Any thoughts welcome. It's been a long time and it's good to be
back!
Sigean
#Post#: 2989--------------------------------------------------
Re: Falcone engine overhaul - post valve breakage...
By: banquo Date: May 29, 2025, 3:45 pm
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Ahhhh.
Not a good result.
Try Schubert SMS Moto for a connecting rod. They have a lot of
spares. Or Retro at Abbadia, just along from Mandello.
My head was repaired in Germany with 8mm valves, but I don’t
know all the details I’m afraid…
Good luck!
#Post#: 2990--------------------------------------------------
Re: Falcone engine overhaul - post valve breakage...
By: Sigean Date: May 30, 2025, 2:42 am
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Dear Banquo,
I think we might have had a few exchanges on this Forum or
others (ADV Rider?) in the distant past, and thanks for the
comments.
Could you tell me from whom you bought the new valves? Might it
have been Pirner - they seem to get lots of mentions in this
regard. Reports from users of the lighter valves are varied,
but I feel there is a rightness in losing some of the weight of
the original system. I just don't want to have to undertake
again the repair and reclamation work on which I have now
embarked...
Sigean
(Peter Newton from East Devon)
#Post#: 2991--------------------------------------------------
Re: Falcone engine overhaul - post valve breakage...
By: banquo Date: May 31, 2025, 4:18 am
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Yes Sigean, I’m sure we have been in touch before.
Sadly, this forum has pretty much died, so nobody is there to
answer your queries: I Bly found your post because you had
replied to a previous one, and I get notification of that….
Everyone is on my Facebook group now, and you would likely get
more answers there.
I don’t know where the valves were sourced, as the whole thing
was managed by my friend in Austria. He took the head to a small
scale specialist in Germany, and he fitted the 8mm valves,
guides, seats and lighter springs.
There’s a post about it on here somewhere, I think, although the
photos may have disappeared.
The valves are a little too short, and I was supplied with caps
to extend them. Valve stem oil seals were also fitted. I have
been told that some kind of Ducati valves can be used.
Not much help, I know….
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