Purchased for 2021 SSR125 took no longer than 30 minutes to install and definitely increased runnability overall maybe made the power more efficiently produced but cant say it was a boost of HP. Will have to use the original carb spacer and gasket from intake manifold to carb. Everything matched up great, wish the air filter was tucked under the bike a little more as your leg can bump it once in a while. The jets that came in the carb had to be swapped out immediately they were way to small and the air/fuel mixture screw needs to be perfect, a fuel air mixture knob would be a good purchase with this as the stock one is very hard to reach.