Kawi2strokes.com Forum

I couldn't quite get the gist of it either - I think your observation is correct Joe.. but knuckle draggers like me are always looking for RPM and throttle position info. Not used to flow bench numbers. Can a chart also be made that shows what happens in a scenario like that when you swap pilots? Or jet needles?

I know I will get lambasted for this (even if no one says so )
I have always tuned (close on the pilot and needle first of course) the main jet first "ISH' then went back and and adjusted the the other circuits slightly.
Every time I have tried to follow the carb tuning guide I get it all screwed up, if I do it my way it seems to go better for me......I never can follow directions

Just to be clear Im not saying tune main first, just that I try to get a good main jet as soon as possible then tune the rest.

To clarify the results on the flow bench.

At the far right is max. flow at WOT Far left is about 19% throttle position.

At WOT it is obvious, as most know, how much the main jet contributes to the flow to the venturi which I measure with a mass flow meter(air) .

What is interesting is the amount of effect of the main closer to idle.

To answer the question: Yes the bigger main comes on sooner at part throttle.

It is not a purely geometric relationship as the spreadsheets suggest. This is a system of 2 jets in series and each has an effect on the other.

Needle jet partially blocked by the needle(variable) and main jet(fixed).

cliff EDITED-230MAIN JET USED ON -3 CLIP POSITION DELETED SORRY

This one shows clip position DOES have influence on mains and 1/2 throttle

Yes, needle clip position does have influence from 1/4 to full throttle operation

Dyno/Flow Bench is useless for final tuning, no-one has ever driven/ridden a dyno, or flow bench around the block, or race track

"Seat Of The Pants" Dyno is the ONLY one that gets it right, EVERY TIME

True Dave,

This was just an experiment to get an overall interaction of the circuits, not for tuning on the spec. bike.

cliff