I need some help figuring out what is wrong with my bike before I decide to dig deep into it. I have an '86 venture that has 74 K miles and has an unknown history for most of those miles. Here are some recent repairs: new plugs 1/2 yr ago, new cables & caps this year, new diaphragms last year, carbs synced last fall.
My scoot has been underpowered for some time and is getting worse. Tonight I was out looking trying to rule some obvious things out. One thing that is new and significant is that I found a small amount of emulsified oil and what appears to be radiator fluid in the air box (see picture). It seems that it is coming from the engine breather tube that is feed back in to the air box. After the engine is warm you can see a steady stream of smoke/vapor coming out of this tube in the air box. I also do not know what that chamber does that is mounted between the "V", it appears to have both cooling and the engine breather tube. I can't seem to find good documentation on this thing . . .
So . . . Do I have a blown head gasket, needs a valve job, or could this be caused by something else??
This site is awesome and very friendly!
Thanks for your help!
Mike