Wow, finally got this resurection to run and found i have to pull the cap off the head to replace the thermo switch and when I pulled the riser that has double hoses off a dark oil like substance poured out. Is that normal or am I hosed? 92 wave 3 w/650. Its the upper most exhaust looking thing (metal) that says Yamadog on it, painted silver. Thank you in advance for your kowledge.