jets question

[skippy]

there is a lot of jetting questions at the moment so ill make it a little more complex...
 all the jetting questions are on the main jet, nothing mentioned about the idle jet...
seen on a fue shops books on jetting how to jet right etc. the main jet we know but , but they all mention re jetting the idle jet. i can understand this on a big scoot,but what about a 50 cc would it realy make any difrence? is it needed?....
 all the books clame a bost in power and torque.. as no one has mentioned this im thinking that it does next to nothing.
whats everyones thoughts?

[whiteknight]

i know if you want to tune the carb perfectly, you can tune each jet for the part it plays through 1/4..1/2..3/4..wot. being as each jet plays a diffrent role you can change the jets to get the perfect mix through the rev range and possibly get the most from the engine.

heres some pictures to show what im trying to explain

[mono]

In theory your idle jet could be the wrong size as soon as you change your setup, especially modifications to the airbox and such will have an effect on the idle mixture, and indeed also on the mixture at low rpms and low throttle...

In practice, with a 50, 72 and 85cc, I've upjetted idle jets to one or two sizes larger, and the only difference I could notice was that I needed to readjust the idle mixture screw...

My guess is that we drive our small CVT controlled engines in the half/full throttle / higher rpm range for most of the time, so we don't really spend noticeable time in the lower rpm/throttle range where the idle jet would make a difference...

[streido]

+1 im with Mono. Most times i ride WOT anyway or there abouts.