last weekend retro fitted these to the mighty ztt.all new nuts bolts gaskets e.tc. however one side had a damaged casing.stripped it down today .changed the motor over.their is no difference to the powerfold.to the none powerfold.so far so good but the new gaskets where soaked .i could have wrung them out.now sealed with black sealant ,.is this a problem? as far as i am concerned it is discuss