RE: Nova Or RB
jp2. the novarossi XR is the most powerful 28 on the market. It doesnt need the assistance of the jp1 because it has so much bottom end. The Jp2 allows the engine to breathe and reach higher rpms. I ran one in my LSP this year and it's power is unbelievable to the point where it becomes difficult to control. I had to tame the engine to deliver smooth power by going up on the clutch bell and limiting my throttle servo not to open fully to deliever a smooth power. It's the best motor hands down, but fuel consumption is average. I got 7 minutes with the smallest restrictor on the carb. That helped milage big time.
Once fully broken in, this engine will scream @ 200-210 degrees. There is no need to go any higher than that.
I tried the 86 ofna pipe. Make sure you use a 13 th clutchbell if you do. If you run a 14 th it will hit the pipe later rather than sooner. That was my experience. The Jp2 works best.......