I would call Nitrohouse and talk to Rob. They don’t have a complete o-ring kit listed, but they can get one made up and send it to you.


I have owned a couple Hyper 8 ports and tested different carbs. You will lose performance when using the OS 20e carb. The stock carb is a great carb if setup correctly. But what happens too is the o-rings dry out and then it makes it impossible to tune. Replace the o-rings and you will have a cheaper fix and better performance. Then tune it like Rob from Nitrohouse was quoted above.