Yeah i tried all sorts of stuff with that bike,some of it worked,some of it didnt...it was one of those things where once i had my fill and accomplished what i set out to do,i moved on to other things..i do have a pretty trick head i made out of a XL500 reed valve head,took out the reed,welded up the hole,expoxied,ported,titanium valves....its one of those*one of these days* projects..course its been 20+ years of *one of these days* lol....oh yeah,FJ1100 cylinder studs cause i kept breaking the so called heavy duty studs that were available..think theyre 10mm studs vs the 8mm...by god,my torque wrench went *CLICK* loudly when i tightened em down,none of that wussy stretchy feeling tightening ha ha..solid...oh yeah,XR600 cylinder sleeve with some one off flat top pistons,100mm,i think its 627cc...like i said,one of these days...probably another hand grenade..