here in the UK, I've yet to find a single person (nevermind Kawasaki dealer or even bike repair shop) that has ever heard of a pair valve ! My er6 with a yoshimura popped a lot initially, but it has diminished with miles on the clock. My local Kawi dealer said that even the stock pipe pops. Couple that with the fact that finding any silicone caps is impossible and I'm not sure I can be bothered to block the pair valve. In fact it seems to be running fine without the lambda sensor either, so the sensor eliminator I got must be doing its job (despite several forum members on another site telling me it would ruin my engine). 2500 miles later and it hasnt blown up yet.
Last edited by mullum; 02-09-2011 at 09:46 AM.