Albert sorry first of all I have done 4500 kms since conversion not 1500 i accidently put in the wrong mileage)thanks for the reply the new barrels were run in very carefully( considering these are modern pistons with nickasil barrels however i ran in the bike as follows) 500 miles on bendy back roads giving changing revs and loads below 3000 then 3500 revs then an oil/filter change, then the next 400 hundred mile kept below 4000 revsmax, the last few hundred miles kept the revs about 4-4500 only after covering well in excess of 2000kms (1500) mile did I open up over 4500 always below 5000 revs. Since then I have stretched the use of the revs very occasionally but never really pushed the bike hard. (other than as stated for overtaking and 2 up acceleration even then nothing dramatic no where near the upper rev limit - i usually ride within 50 /70 mph with some 80 mph when solo. The piston rings were all put in the right way up and very carefully. The rest of the engine was not rebuilt at any time, the heads and valves are all original and in good order -however I will probably put new valves, springs and guides in after christmas. I never took any edges off the pistons as they were fine and had no rough edges. all the rubber grommets are in place. thanks for your comments/observations.
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