The person who modified the engine is the only person who in theory can get succesfully sued, The bottom line being that if this was to occur as a direct fault of the manufacturer they would probably claim "misuse" as the major contributing factor and as we all know money wins legal matters not people and you and I would run out of money long before any major engine manufacturer.
By the way I am sure that Novarossi (who I use and recomend)would not use any dirty tactics should this type of incident ever occur.
After seeing recently what can be caused by any fool with a dremel, I think that they are just covering thier backsides.
Did I mention Novarossi rule!!!!!!!!!!!
GT