make sure the slide's groove is lined up with the small nipple inside carb and it should fall in all the way. as for the chain breaking what is the root cause of chain breaking in the first place? old chain, missing master link,or break for some reason, did it fall off rear sprocket? too much slack? and what was the "pistol" noise? chain whipping around? motor break or frame break? and then what caused the motor to die? chain jam? electrical? or from chain breaking? always make sure their is a master link in place and is in the right direction! and never be greedy on the chain lube! for a chain to break, something bad happened and is mis-aligned! check your ride carefully, your life depends on it!