It was the first oversize after std, but so long ago I've forgotten the number. I have the specs in a file and will look them up later. I also put in a Crane high lift cam(reguires different valve clearances), R&D valve springs, and a Super Trap exhaust. I allways use Golden Spectro 4 engine oil 20w50(works for me, but I ride in very hot and humid weather). After the performance work vibration does increase. Just recently had to replace the intake manifolds(rotted)and all the o-rings in the carb(hard and brittle). Power is great. Another bonus is Progressive Suspension in the front. It makes a noticable difference.
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