pilot jeting help.

[newbeginingsxs400]

I am currently building a xs400 chopper not 100%sure on the year but its between a 77 an 84. anyways, I'm running uni pods and straight pipes. decided to bring the main jet up a size as well as the pilot.(now running 137.5 main and 45 pilot) the bike idles but has a hard time coming back down from a rev. anyone has any idea what's going on? pls help!

thanks
-g

 

[CaptChrome]

Hanging idle after revving it means that the idle mixture is too lean. You will need to adjust the idle mixture screws and open them a bit at a time (maybe ¼ turn each adjustment) to richen up and dial in the idle mixture. There are some procedures in past posts on here that describe how to adjust these screws - search for idle mix adjustment and you will find lots of advice on this.

 

[newbeginingsxs400]

thanks capt! i did a bit of research and my carbs were just not synced