Greetings;
Need help regarding cold (#3 & #4) header pipes. Bike is a '96 ZL600 with 18k miles on it (never been rained on).
What are all of the possible causes that would create this condition?
Exh header temperatures @ idle RPM (Ckd via infrared heat gun):
#1=141, #2=140, #3=104, #4=96

Note leaning #3/#4 by turning mix screw in or our from the 1 1/2 setting has NO effect on temp.
Also Idle is rough. Runs great above idle circuit rpm (2000rpm).
Any ideas/advice greatly appreciated.
Thanks

 

lack of air/fuel ie float heights, inproper synchronization would be my first guess if you know that the filter is clear and that the hoses are not pinched.

Welcome to KF and good luck on the fix.