The aluminum one is already a great kit and it's been making a name in Italy for it's price, performance and overall quality. A friend of mine, has been riding everyday with a Stelvio kit on his PX150 for the past 6 months and after 4830Kms his is very pleased with the kit. Apart from a little piston rattle (had it from the start) the kit is bulletproof so far...
Following, a video (don't use Chrome cause it won't play) from a dyno run with the Stelvio, installed as P&P without porting. Standard re-jetted SI24/24 and a Polini Original BOX exhaust pushing 17HPs. Not Bad...
A new piston and a re-bore on a stock cylinder will cost more than this kit...
Port timings: 110°/170°
Suggested squish: 1.2mm ±0.1mm
Last edited by SaFiS on Fri, 09 Nov 2018 18:37:03 +0000; edited 1 time