Stage 1: Intended for motorcycles with a stock engine using the stock airbox, air filter and stock pipe. Stage 1 kits are fully adjustable to allow the use of a well designed aftermarket pipes and stock replacement air filters like K&N. Stage 1 kits are designed to improve throttle response and driveability and in most cases power increases of approximately 5% throughout the entire power range can be achieved
Stage 2: Intended for motorcycles with a stock or mildly tuned engine using a well designed aftermarket pipe with a modified airbox and a stock replacement air filter. Stage 2 kits are designed for applications where individual filters cannot be installed and for applications where airbox modification improves the engine's performance. In most cases power increases of approximately 8% can be achieved
I bought a Yamaha Roadstar 1700, got a great deal on it, it had aftermarket pipes and air cleaner but was jetted improperly causing a big lean condition. Bought the dynojet kit, the instructions were easy to follow and it came with plenty of jets for tuning. Got it all together following dynojet recommendations and it runs like a dream. Easy starts and great smooth power.
Ray - June 6, 2016
(Murfreesboro , TN)
Installed the kit in my '08 shadow 750 in about an hour. Added a little noticeable power throughout. Smoother idle and a little faster rev. Well put together kit with the mixture screw adjustment tool, new needle and spring. But I have one gripe, and that is the instructions are vague and not so helpful, but its a straight forward and easy install.