Rich (macdracer@...) wrote:
[fitted a Cobra ISDE]
> I know that until I do this the bike will be running a little lean,
> but how much should I worry about this?
Not a lot.
> Ride it a little, don't rev
> it a lot, or don't ride it at all? My gut says ride it and don't
> worry, just rejet it as soon as possible to achieve the full affect
> of adding an aftermarket exhaust.
Just ride it and see what it does.
Go for a cruise up the freeway and do a good old fashioned plug chop.
See what the plug looks like and if it's looking lean then think about
a rejet.
[...]
> I'm also wondering about the jet size increase. Is an increase of 3
> sizes the norm or does this depend on the pipe/muffler being used,
> etc.
Depends. Many people just fit a Dynojet kit and be done with it.
Just upping the main jet is only part of the solution. The pilot jet
_might_ need upsizing, and the needle profile may need to be different
too.
The needle has a lot of influence in the midrange along with the main
jet, and very generally, the midrange is where many bikes spend a lot
of time.
There is no guarantee that the needle in the Dynojet kit is perfect
but it does have some of the adjustability that is lacking on the stock
needle.
Mister_T