Locutus 1, I hear you saying you followed Terry's instructions on setting the valves. I'm not sure if you understand what Greybeard is saying. Read Greybeards post and set your valve lash at TDC on the compression stroke. Set it somewhere between .006 and .008. Then turn the engine over a few times, put it back at TDC on the compression stroke and re-check the lash.
Our 49cc engine with the performance cam has 8 hours of run time, most of which is track time. There is no additional valve train noise and this particular bike has been the most reliable in our fleet of bikes.
thats what i did i turned it till both lifters were loose at the same time i didnt look to see where the piston was be it at the bottom of the stroke or tdc either one as long as the lifters are both freed up at the same time which is only one time during the compression stroke at the bottom just before it comes up as you come up theres pressure starting to build on the lifters and they arent loose so bdc from...
then i set them both at 008 put the cover back on ran it the lifters were louder than the hs motors normally are.. and i had a hiccup mid throttle where its fine off the line but hesitates then comes back a dead spot.. then i reset the lash at 009 instead of 008 both sides and dead spot is now gone and lifter noise is now half or back to stock...
now before i put this cam in the lifter noise was minimal since its doubled it i assume because of the more agressive timeing. and the fact these motors use a pin and the lifters slap around...
the tighter i set the lash i went the lifter noise worsend which is odd becuase it should be better not worse
did you notice a increase in lifter noise on your bike or was it the same?
and bdc is just before tdc of the compression stroke i found no where else in the stroke where its loose other than that.. other than that it has much better response i cant wait to get it on the road