my friend also has an old gilera runner i have an puch piaggio ntt. the old ones are faster they say. i am familiar with the bounces, never really noticed but when you starting too talk the subject i start thinking about it. his runner had this bouncing also just a little. maybe because my tank is on the rear, maybe bounces a little because too little weight on the backside and narrow design. i also noticed the absorber on the runner is very long. But i always like his runner better because his piaggio block has a larger reduction and a big gas tank. It was faster and i loved the key and the design of the lights.