hi i got an aprillia sr 50 stealth watercooled version a while back i bought a dr70 bigbore kit and a leovince RS exhaust also i upjetted to 90 on the main that was fine everything in the garden was rosey BUT the other day i got a crack in the exhaust so i bought a leovicie ZX expantion exhaust now it runs like a bag of spanners at low revs up to about 5000rpm then it is like a rocket thats on the stand when i ride it it dont rev above like 4000rpm and it would not pull the skin off a rice pudding also i had the 4,3gram rollers and the massoly yellow springs that came with both exhausts any ideas guys ? :/
and i aslo have removed the silly funnel restrictor in the exhaust