i just fitted a 70cc piston on speedfighter 2 2001 mod.when u rev it it rattles on slow revs in bottom of engine shpo sad 400 to fix is it a easy job to fix
sounds like the main bearings need replacing i would charge half of that,its not easy unless you have all the right tools and you know what your doing as it can easily go pearshaped !
adam bike doctor(of milton keynes motorcycle centre)
March 2011
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