Main jet xj900

I have a xj900 4bb, have custom air filters.got it running, but not every well.need to reject , any ideas of size main jet I need

 

http://www.xjbikes.com/forums/threads/good-information-on-pods-vs-airbox-thanks-sybe.113331/

 

Dog, welcome to the forum!

PODS, lets just say you really need to do some work when you go to them. Lots of us have tried and gone back to the air box on the CV carbs. I have to agree with the look and the ease of pulling them and then putting them back in, but the performance you get from the air box and the factory jetting sure is nice. If you really want to stay with your pods then you will need to do some research and play with different jets. All the information is here on the forum all you have to do is search for it and then do your own research. Bottom line, it will take sometime and tinkering to get it where you want it to be with pods. IMHO.

 

this link to determing stock jetting http://xjbikes.wikidot.com/carb-specs
if you just modified you air filters
+2 sizes main jet for pods
Increase the pilot fuel jet size +1 for every +3 main fuel jet size increases.
which gets you to
A GOOD STARTING POINT.

then read this link on how to tune your carbs

http://www.factorypro.com/tech_tuning_procedures/tuning_carbtune,CV,high_rpm_engines.html