550cc - Yamaha Nytro, Viper

Just installed these on my Viper and the idle smoothed out immediately. The 550cc flow rating was exactly what I needed for my mild mods.

Replaced the stock injectors on my 2009 Nytro with these and the 550cc flow rate smoothed out the idle perfectly. Install was straightforward and the engine feels crisp through the mid-range now.

Bolted these into my Viper and the 550cc flow rate matched the stock tune perfectly, no sputtering at idle or hesitation on the trail. The precise fuel delivery was noticeable right away, especially in the mid-range where it feels much crisper. Exactly what I needed to keep the sled running clean th