right if what your saying is true the bike has L1 barrels both of them, the rear head (the one thats poped) is a KV3L and the front which i replaced and assumed is a R is a KV3H Doh,

So should i seek a Matching KV3L head for the front as well or is R head on a SP barrle ok??

Wonder why an R modle has L set up?