what are they for?...refer to parts schematic on this site......are they placed in the crankcase tubes as they are without any alteration?..the drain tubes appear to me to drain extra oil/fuel mix away from the 2 main (top and bottom) bearings. The metering rod appears to belong in a water passage, just under the exhaust plate, but i don't really have a clue... search of the internet and my 15 booklet manual fruitless... do they just drop in the crankcase tunnels and that's it?