posted
I know the mid-needle or the Spray bar on th carb is to adjust air and fuel mixture. I like to know where I can read up on this information??
IP: Logged
posted
I will tell you my experience of playing with this setting. I am surely no expert engine tuner or engineer so agree with as much as you like.
Low end needle controls acceleration from still to 5 feet out. Mid needle controls acceleration from 5-25 feet. Top needle from there on.
The relationship of the low and mid adjustment is what controls your fuel mixture at idle and near idle. If you screw one inwards you must screw the other outwards to compensate and keep the setting static.
The mid adjustment cannot affect the fuel flow by itself, all it can do is to affect the position into the carb venturi into which the fuel is introduced. It is a very subtle effect but it seems to be the closer to the middle you introduce the fuel the higher the fuel consumption and better "middle throttle" acceleration and punch. The further from the centre is better fuel consumption but a loss in "middle throttle" punch.
Please accept my findings for what they are based on a few days of track testing and "seat of the pants" feel.
Posts: 12 | From: World | Registered: Sep 2002
| IP: Logged
UBBFriend: Email this page to someone!
