DIR Return Create A Forum - Home
---------------------------------------------------------
The Mighty Nuovo Falcone VOC
HTML https://nuovofalcone.createaforum.com
---------------------------------------------------------
*****************************************************
DIR Return to: Engine and Transmission
*****************************************************
#Post#: 1659--------------------------------------------------
Bogging and backfire on acceleration
By: krisztian_andre Date: October 30, 2016, 12:46 pm
---------------------------------------------------------
HI,
finally got the papers for my NF and took an 80km ride.
I noticed a strong smell of fuel from the exhaust when stopped.
If I open the throttle fully while doing 80kph or so the engine
boggs down and I hear a loud bang(backfire). If I'm careful with
the throttle then I can reach 100kph, but slowly.
Is this normal?
Regards,
Kris
#Post#: 1664--------------------------------------------------
Re: Bogging and backfire on acceleration
By: cloggy Date: October 31, 2016, 6:08 pm
---------------------------------------------------------
No
#Post#: 1665--------------------------------------------------
Re: Bogging and backfire on acceleration
By: cloggy Date: November 1, 2016, 6:56 am
---------------------------------------------------------
Assuming you haven't dicked around with the jetting I would say
the float needle is sticking, maybe just dirt preventing it
sealing
#Post#: 1666--------------------------------------------------
Re: Bogging and backfire on acceleration
By: krisztian_andre Date: November 1, 2016, 7:52 am
---------------------------------------------------------
That explains fuel disappearing from the tank when I leave it
standing long.
I cant seem to be able to turn the fuel valve on one side to
close it and on the other side if I turn the valve handle the
screw under it turns with it and starts leaking.
#Post#: 1669--------------------------------------------------
Re: Bogging and backfire on acceleration
By: randall Date: November 1, 2016, 8:48 am
---------------------------------------------------------
I agree with the previous suggestion and my advise is as follow:
1- clean up carefully the carburator (change all the filters,
seals and gasket using the revision kit of Dellorto)
2-verify that all jets and adjustments are as specified,in
particular you should verify that the float needle is a "red
point" one suitable for unleaded petrol ;
3-adjust rhe carbutator as per specified values;
4- verify the advance and contacts points opening are as per
required values;
5-Use gasoline 98 of high premium gasoline ( do not use biofuel)
#Post#: 1670--------------------------------------------------
Re: Bogging and backfire on acceleration
By: randall Date: November 1, 2016, 9:05 am
---------------------------------------------------------
Also for the fuel valves , you can reconditioning them,
for the valve seals if are damaged, you can made them out of
Viton gasket plates;
With the NF you can solve almost every inconvenient by your
self, providing that you divide the bigger problem into many
little problems.... 8) 8) ;)
#Post#: 1679--------------------------------------------------
Re: Bogging and backfire on acceleration
By: cloggy Date: November 4, 2016, 1:57 pm
---------------------------------------------------------
I wouldn't go to that trouble and expense initially. I'd just
take off the air filter housing pop off the float spray and
clean with something not abrasive the float needle and seat and
put it all back together again. You could check on the float
height but unless you have the specs I'd clean the float jet etc
first. If it's been sitting around it may have gunged up. My
tank had water in it and I did have to fiddle with the float
height. To test that just run it with the fuel taps closed and
if the revs pick up then the float height is too high, or your
float is still leaking. If it spits off idle then that's often
an indication it's too low, assuming your jetting is close. I
just bent the float tang to weaken and then reset to richen it a
tad, didn't take it apart, or remove the carb .
#Post#: 2605--------------------------------------------------
Re: Bogging and backfire on acceleration
By: krisztian_andre Date: April 14, 2019, 8:22 am
---------------------------------------------------------
I changed the fuel taps and cleaned the carb.
The fload axle was bent which resulted in fuel leaking into the
cilinder and engine oil.
Going to rebuild the engine this year.
*****************************************************