rejetting, new exhaust, new air filter...which order, does it matter??

[dbrasco]

hola,

as with everyone else here, i would like to make my gs perform to her best.  have been doing some reading on the above topics and am a bit confused on some issues.

in which order would you recommend the upgrades be made? or does it matter?  is it better to save up for all upgrades and do them at the same time, or can i do them one at a time? as i have never been good at applying delayed gratification...

also, some pics as promised in an earlier post...




i have done the fenderectomy, added bar end mirrors, and replaced the cover on the engine casing since i took these pics

[cheetahman]

The re-jetting in the carbs is done for several different reasons.  From the factory these bikes are lean.  It has to do with EPA regulations which apply only in the USA I believe, and so, affect only units destined for the USA.  Many people just want a correct running stock bike, so they rejet to sizes that are appropriate for the stock intake and exhaust track.  This requires richening the fuel mixture a little, like 4 to 7%.  However if you change something in the intake or exhaust track, i.e. new header and muffler, or K&N air filter, then the jetting should be relooked at again.  It might need to richen up the mixture by 12 to 20%.  It all depends on your current use and conditions and what your future plans are.  Good Luck

[jestercinti]

All at once if you can swing it.  Air filter = rejet.  exhaust = rejet.  Every time you change the amount of air going into the engine, or the amount of flow going out of the engine (back pressure), you need to rejet.

Let's say you add an air filter.  You'll have to jet to compensate for more air so the mixture is not too lean.  If you change the exhaust later on, you need to jet again to compensate.