need serouis help on nova carb
#1
need serouis help on nova carb
i've finish breaking in...and it run alright with the factory setting...here is the problem...when i turn the high -speed needle leaner and when i gave it full throttle it stall....i've try leaning and riching the low speed and mid range needle..but no luck....can anyone help me plez..
BTw its a novarossi cx-12 engine..
BTw its a novarossi cx-12 engine..
#2
Tech Master
iTrader: (13)
my advice is, first, dont touch the middle speed needle unless u are VERY sure of what you are doing
read the instruction manual, (or maybe try the nova website?) and go back to the factory setup (both the high speed and low speed needle)
then try leaning the engine from there, 1/8th of a turn at a time
and see what happens
read the instruction manual, (or maybe try the nova website?) and go back to the factory setup (both the high speed and low speed needle)
then try leaning the engine from there, 1/8th of a turn at a time
and see what happens
#3
this is what i know about needle...
high speed: how much fuel goes in at full speed
low speed: how much fuel goes in at idle.
ldle screw: make a stade idle
mid range: how much fuel at mid to high speed....
correct me if i got it worng..
high speed: how much fuel goes in at full speed
low speed: how much fuel goes in at idle.
ldle screw: make a stade idle
mid range: how much fuel at mid to high speed....
correct me if i got it worng..
#4
Tech Elite
iTrader: (6)
Re: need serouis help on nova carb
Originally posted by TRF_TG10R
i've finish breaking in...and it run alright with the factory setting...here is the problem...when i turn the high -speed needle leaner and when i gave it full throttle it stall....i've try leaning and riching the low speed and mid range needle..but no luck....can anyone help me plez..
BTw its a novarossi cx-12 engine..
i've finish breaking in...and it run alright with the factory setting...here is the problem...when i turn the high -speed needle leaner and when i gave it full throttle it stall....i've try leaning and riching the low speed and mid range needle..but no luck....can anyone help me plez..
BTw its a novarossi cx-12 engine..
#6
Originally posted by td-civ
i had the same prob the u need to bring the mid up just a little and then set the high speed up a little at a time till it runs its a pain and check your plug to see if it is lose
i had the same prob the u need to bring the mid up just a little and then set the high speed up a little at a time till it runs its a pain and check your plug to see if it is lose
what do you mean by " need to bring the mid up just a little "
clockwise ??or anti-colckwise..??
#7
Originally posted by TRF_TG10R
this is what i know about needle...
high speed: how much fuel goes in at full speed
low speed: how much fuel goes in at idle.
ldle screw: make a stade idle
mid range: how much fuel at mid to high speed....
correct me if i got it worng..
this is what i know about needle...
high speed: how much fuel goes in at full speed
low speed: how much fuel goes in at idle.
ldle screw: make a stade idle
mid range: how much fuel at mid to high speed....
correct me if i got it worng..
#9
First my post for INITALID-it is not right about the high speed needle! Every needle on carb work by it self-high speed needle adjast anount of fuel lets sey as "A", midlle range needle idependanly adjust amount og fuel, wich is less then "A" and finaly idle speedneedle adjust even much lees fuel then middle range needle. So, there is no realy relalation between needles!
Now is for TRF_TG10R-can you describe how the engine getting stall. If you will be able to describe it (reving right before stall or just stop seddeny), I might help you with that, just give me as much as possible info
Now is for TRF_TG10R-can you describe how the engine getting stall. If you will be able to describe it (reving right before stall or just stop seddeny), I might help you with that, just give me as much as possible info
#10
what makes a engine stall?
#11
can be anything-too much fuel-not enough air, to much air-not enough fuel! Engine is too cold, etc. Needs more description of the moment when the engine got stoped
#12
Originally posted by Top Gun 777
First my post for INITALID-it is not right about the high speed needle! Every needle on carb work by it self-high speed needle adjast anount of fuel lets sey as "A", midlle range needle idependanly adjust amount og fuel, wich is less then "A" and finaly idle speedneedle adjust even much lees fuel then middle range needle. So, there is no realy relalation between needles!
Now is for TRF_TG10R-can you describe how the engine getting stall. If you will be able to describe it (reving right before stall or just stop seddeny), I might help you with that, just give me as much as possible info
First my post for INITALID-it is not right about the high speed needle! Every needle on carb work by it self-high speed needle adjast anount of fuel lets sey as "A", midlle range needle idependanly adjust amount og fuel, wich is less then "A" and finaly idle speedneedle adjust even much lees fuel then middle range needle. So, there is no realy relalation between needles!
Now is for TRF_TG10R-can you describe how the engine getting stall. If you will be able to describe it (reving right before stall or just stop seddeny), I might help you with that, just give me as much as possible info
#13
Originally posted by TRF_TG10R
when ever i lean my engine out (3 turn out) high speed needle...when i gave it 1/2 gas...it bubble.....full throttel it stall..
when ever i lean my engine out (3 turn out) high speed needle...when i gave it 1/2 gas...it bubble.....full throttel it stall..
richening HIGH Speed needle----anti-clockwise direction
In tis case u r richening ur engine...another thing u should go by 1/12 increments
#14
what i would do is to set the needle back to factory.
Start the motor, make sure it idle at least 10-20 sec., if not increase (clockwise) the idle screw to achieve this.
First, set the high end needle:
Run the car on the track for a few laps. Come into the pit, lean the high speed needle 1/8 of a turn each time. Repeat this process until you are satisfy with the speed and power. You MUST see trail of smoke when powering out of corner/exit. If you see no smoke, you're too lean!
Second, set the low end needle:
After making few laps on the track where you are happy with the speed, come into pit and listen to the sound. If the motor rpm goes high for 2-4 sec. then return to normal, you're a little rich, you can close 1/16 of a turn and do a few more laps. Another good thing to do is to touch the carb body (below the high speed needle) if its hot. You should be able to touch it and the carb body should be cold. If hot, you must open (anti-clockwise) the low end needle 1/4 of a turn and then go on track make some laps. Do this when you can safely touch the carb body with your finger. Another way is to pinch the fuel tube going into the carb, the motor will die off between 2-3 sec. if it dies almost immediately, your low end is too lean!
Set Idle Screw:
After some laps on the tracks after setting the low end needle, when you come into pits the next time, you should hear the motor rpm stays high for very long. This is the time you decrease the idle screw (anti-clockwise) until the rpm is stable.
hope this help.
Start the motor, make sure it idle at least 10-20 sec., if not increase (clockwise) the idle screw to achieve this.
First, set the high end needle:
Run the car on the track for a few laps. Come into the pit, lean the high speed needle 1/8 of a turn each time. Repeat this process until you are satisfy with the speed and power. You MUST see trail of smoke when powering out of corner/exit. If you see no smoke, you're too lean!
Second, set the low end needle:
After making few laps on the track where you are happy with the speed, come into pit and listen to the sound. If the motor rpm goes high for 2-4 sec. then return to normal, you're a little rich, you can close 1/16 of a turn and do a few more laps. Another good thing to do is to touch the carb body (below the high speed needle) if its hot. You should be able to touch it and the carb body should be cold. If hot, you must open (anti-clockwise) the low end needle 1/4 of a turn and then go on track make some laps. Do this when you can safely touch the carb body with your finger. Another way is to pinch the fuel tube going into the carb, the motor will die off between 2-3 sec. if it dies almost immediately, your low end is too lean!
Set Idle Screw:
After some laps on the tracks after setting the low end needle, when you come into pits the next time, you should hear the motor rpm stays high for very long. This is the time you decrease the idle screw (anti-clockwise) until the rpm is stable.
hope this help.
Last edited by RClover; 05-25-2003 at 08:27 PM.
#15
Originally posted by Top Gun 777
First my post for INITALID-it is not right about the high speed needle! Every needle on carb work by it self-high speed needle adjast anount of fuel lets sey as "A", midlle range needle idependanly adjust amount og fuel, wich is less then "A" and finaly idle speedneedle adjust even much lees fuel then middle range needle. So, there is no realy relalation between needles!
First my post for INITALID-it is not right about the high speed needle! Every needle on carb work by it self-high speed needle adjast anount of fuel lets sey as "A", midlle range needle idependanly adjust amount og fuel, wich is less then "A" and finaly idle speedneedle adjust even much lees fuel then middle range needle. So, there is no realy relalation between needles!
Anyone will tell you that leaning the High speed needle will indeed lean the Low speed needle settings because the main fuel delivery system comes from the High speed needle first. That is the primary reason why you tune the High speed needle before touching the Low speed needle.