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The Mighty Nuovo Falcone VOC
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#Post#: 2962--------------------------------------------------
engine bogging and miss firing at full throtle openings
DIR By: oliver54
Date: September 6, 2023, 6:18 pm
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Hello my 1971 nuovo falcone runs great ,starts and runs great
except if i try to give it full throttle it then bogs down and
miss fires until you reduce the throttle opening , you can
slowly feather the throttle until a higher speed is reached .am
i correct in thinking carburetor issue .it has the standard
delorto carb and is totally stock
regards Oliver
#Post#: 2963--------------------------------------------------
Re: engine bogging and miss firing at full throtle openings
DIR By: Gaffertape
Date: November 9, 2023, 4:21 am
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Hey Oliver , i had a similar issue with mine years ago ,
starting and running fine but would have to back off the
throttle and feather it as you say to gain a bit more speed ,but
once i had come to terms with the relatively slow top speed i
found i was quite happy plodding along and just enjoy the
views! It got worse on a longer ride once ,and it seemed to be
running a bit smokey , it was just a matter of stopping and
readjusting the idle screw on the carb .I think the machine
vibrates that much it was winding that adjustment screw out
just a tiny amount as i travelled along . It certainly improved
by winding it back to run a little leaner ... all the best with
yours and safe travels . Ric
#Post#: 2964--------------------------------------------------
Re: engine bogging and miss firing at full throtle openings
DIR By: banquo
Date: November 22, 2023, 8:08 am
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--- Quote from: oliver54 link ---
>
> Hello my 1971 nuovo falcone runs great ,starts and runs great
except if i try to give it full throttle it then bogs down and
miss fires until you reduce the throttle opening , you can
slowly feather the throttle until a higher speed is reached .am
i correct in thinking carburetor issue .it has the standard
delorto carb and is totally stock
> regards Oliver
>
--- End Quote ---
Morning Oliver, and sorry for the long delay in replying. The
forum is so infrequently used these days, I don't check as often
as I should.... :-[
I have experienced exactly the same as you, and for two separate
but interconnected reasons. The first was when I decided to
protect what was left of my rusty silencer, and fitted another
and much more restrictive pipe: the second was when I replaced
the stock air filter with a fake K&N style conical filter. In
both cases, the result was a mixture that was too rich on full
throttle. I was especially surprised by the air filter, as I
would have expected a cotton filter to be less restrictive than
the stock paper filter. However, many years later, I discovered
that the stock filter was sealing so badly, it was effectively
doing nothing at all....
If you have the standard silencer, and the standard air filter,
then it may be worth considering altering the size of the main
jet. You would think that then engine picking up when the
throttle reduced would be an indication of weak running
(reducing throttle reduces the amount of air, so you would think
richens the mixture) but I'm pretty sure that mine was running
rich.
From the manual:
Choke: 29mm diameter
Slide: 50
Emulsion tube: 265 P
Main jet: 132 (NB, Mick Walker's book says 122?)
Pilot jet: 50
Needle: V 10 2nd notch from top
Idle screw: 1.25 turns out
Good luck!
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