vspec carb problem
07-09-2008, 09:50 AM
#1
vspec carb problem
hi there im trying to tune my vspec it is great on the bottom and top but its realy rich in the middel and im a bit worried about messing with the mid needle could anyone give me some tips or info cheers first time with 3 needle
carb so dont want to go at it like a bull in a china shop
thanks
carb so dont want to go at it like a bull in a china shop
thanks
07-09-2008, 10:16 AM
#2
Don't mess with the mid range needle
07-09-2008, 08:19 PM
#6
Tech Regular
iTrader: (4)
I have not specifically tuned a Vspec yet, but have tuned 3 needle carbs hundres of times. First make sure the 3rd needle is at or very close to the stock setting. Generally I will get the engine tuned using only the main a low speed needle. Only then will I adjust the mid needle, and make coresponding adjustments to the low and main needles.
It sounds like you may actually be lean on the bottom, and compensating by a rich main needle, and the engine is just not clearing out.
What plug are you using?
It sounds like you may actually be lean on the bottom, and compensating by a rich main needle, and the engine is just not clearing out.
What plug are you using?
Last edited by largeorangefont; 07-09-2008 at 08:47 PM.
07-09-2008, 08:44 PM
#7
FWIW - Hundreds of happy V-Spec owners have set the mid needle to the following position (myself included) and left it alone after that:
Set the mid needle flush with the carb housing. Then turn the needle clockwise until the slot points to 2:00. This is for a stock V-Spec. Speeds have a slightly different setting they seem to like (4:00)
I've played with that needle from noon to 4:00, and it's a very noticeable adjustment.
Set the mid needle flush with the carb housing. Then turn the needle clockwise until the slot points to 2:00. This is for a stock V-Spec. Speeds have a slightly different setting they seem to like (4:00)
I've played with that needle from noon to 4:00, and it's a very noticeable adjustment.
07-09-2008, 08:49 PM
#9
FWIW - Hundreds of happy V-Spec owners have set the mid needle to the following position (myself included) and left it alone after that:
Set the mid needle flush with the carb housing. Then turn the needle clockwise until the slot points to 2:00. This is for a stock V-Spec. Speeds have a slightly different setting they seem to like (4:00)
I've played with that needle from noon to 4:00, and it's a very noticeable adjustment.
Set the mid needle flush with the carb housing. Then turn the needle clockwise until the slot points to 2:00. This is for a stock V-Spec. Speeds have a slightly different setting they seem to like (4:00)
I've played with that needle from noon to 4:00, and it's a very noticeable adjustment.
07-09-2008, 08:50 PM
#10
NEEDLE SETTINGS:
High Speed - (see pg 17 of manual) 3 turns OUT from fully closed
Metering Needle - (see pg 22 of manual) Head of screw is flush with
ball link body
Mixture Control Valve - (see pg 22 of manual) Head of screw is 1 full
turn IN from flush with carb body
High Speed - (see pg 17 of manual) 3 turns OUT from fully closed
Metering Needle - (see pg 22 of manual) Head of screw is flush with
ball link body
Mixture Control Valve - (see pg 22 of manual) Head of screw is 1 full
turn IN from flush with carb body
07-09-2008, 08:51 PM
#11
07-09-2008, 08:57 PM
#13
that one isnt measured in 'turns' like the others...
set it up so that your idle gap is about 1mm and adjust from there
set it up so that your idle gap is about 1mm and adjust from there
07-09-2008, 09:03 PM
#15
set it up so that your idle gap is about 1mm and adjust from there
