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[QUOTE="marcusgunby, post: 164998, member: 17066"]
The powervalve on the KTM exhaust port is very good-it can open the main port, then slightly later open the sub ports(im not sure if it does open in this order)It has no bridge and has a very large area compared to the bore.Stange thing is it seems more reliable than the jap engine with a exhaust bridge-backwards to conventional thinking.It is similar to the KX powervalve with the use of  subports but they  are much higher in the cylinder.It is unque in design.Eric will be able to give a fuller description as its been a while since i had a KTM cylinder apart.The CR powervalve is very good as it has very few parts and does a good job generally.However it does expose the exhuast port all at once and if the port has been opened up as big as it can go then the engine struggles slightly as the powervalve opens,this could be due to the very large port at relativly lowish revs.Ive seen CR engines produce a Hp or more than the KTM engine and yet not feel that fast on the track.The KTM has a very powerful and torquey engine where as the CR can be a true screamer(its based on a RS engine after all)
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