Originally Posted by Poly
If the tubes have gone sticky (sounds like PVC tubes with plasticiser migration?) then it may not be something you can "clean off". I'm never a fan of painting, but preparation is always key and sticky tubes doesn't sound like what you would be aiming for.
I must have had a blackout when I bought it, but I concentrated on the engine after the previous experience with a Honda doing only 2700 rpm at full throttle.
Not only are the tubes sticky and dirty, there also is a leak under a strip that covers a vertical seam. The previous owner said his kids always stepped on the tube so he had it "repaired". A sloppy job with dark brown stuff protruding. I'll try Acetone or MEK to clean it and peel off the strip to see what's wrong.