Ok im new to motorcycle maintainence, but have been working on cars since i could see under the hood. Im trying to clean the intake manifold on a suzuki dr350 (199

as it is rusted/muddy. This bike was poorly taken care of and runs like garbage, but i think i can fix it. one of my main problems is currently i cant figgure out how to remove the timing chain. Does this require a special tool? If so where can i get it and what is it called, and is there any other things i can use instead. currently this thing is driving me nuts.