S4R metal fuel tank "leakage"
2004 SR4 steel fuel tank "weeping" area of rear mounting plates pivot. The welded doubled up plates seeping fuel due to poor weld on the second / top plate (the one that is the actual earred plate). Quite apparently one of the top welds damaged one of the lower plate's spot welds sufficiently to cause a small hole in tank's outer shell...resulting in a slow seeping of fuel ! Drips onto rear exhaust pipe of course producing noticeable smoking at warm up.
Check area of rear tank pivot plates for any leakage and fix pronto !
Fixes: clean area of all paint and assure dryness even under the doubled plates w/judicious use of compressed air. Good old J.B. Weld should work well on a minor seepage. If not, the tank needs to be drained, removed from bike, stripped of all internals, blasted clean, resealed and refinished. Not a project for the faint of heart !
BTW I used J.B. Weld on all outer surfaces and a dab on the failed spot weld in tank's interior ( not easy to reach). Don't push your luck, repair any / all tank leakages pronto! Samir 6992