Spoke with builder, wanted full drag port cub and that's what he gave him..a huge exhaust port that does have decreased life...and possibility of not enough lubrication was discussed, talked about fixing and re-plating. Thing is his type of riding doesn't seem to suit the set-up, not placing any blame and is why I am not naming names, I just want to solve the problem, and him to have a reliable ride that will beat his riding buddies! Got some prices, actually Matched my Builders prices, All have gone up a little since I bought my last cub. May just go back with some stock cylinders <- for his friends that are following this, whoever you are