I have a 1987 Suzuki 230 lts and the last few months, it has started to run poorly, her are the things its doing, After a little while of running around, 20-30 mins, its starts to idle really low and sometimes it will stall out, The carb is VERY clean, the oil is new, but, i have a UNI air filter and a cobra full exhaust and i dont know if it needs jetting? when I'm running it and get up some speed and let off the gas and coast it will backfire and pop, and blow flames out. at the end of running it, their is some fluids on the end of the exhaust. What can i do to make it run better, and make the idle better?

 

Bump

 

try setting the valv lash
The lash settings for the 230 are as follows:
.003-.005 - Exhaust
.001-.003 - Intake
this might help

 

How do i do this, and what do i need for tools to do it?