Have to agree with Steve,
Sally on the first run of note blew the right hand crankcase cover gasket at the 10:00 o'clock position where there is little mating surface width. This was despite the faces being checked for true on plate glass, cleaned with brake cleaner and using Honda gasket goop very sparingly with the gasket which was a 'pattern' article. The end result was a back tyre covered in oil and an interesting stop in Auchterarder, followed by a rescue job home!
At about 500miles despite a tourque down the cylinder head gasket, again a pattern job, started to weep from the front nearside, below the exhaust port. Nothing for it but a strip in the frame, yes, it is possible and not difficult. Remove the tank, carbs, exhaust, swing oil cooler out the way and suspend by string from handlebar. Replaced with a genuine gasket at ~ £27-00. Again clean everything off with brake cleaner, check for warping with a steel rule straight edge, re-assemble and torque to spec. Took her for a 20 mile jaunt and let cool overnight. Re-tourqued all bolts and those nuts under the front and back of the head. so far so good with 3000 miles added since.
Moral seems to be the usual " You pays the price and takes your pic!" Costs more for the gaskets than a 2nd hand motor off Ebay! However, having seen the contents of one of those, "Better the Devil etc".
Hope this helps, regards, Bill