Originally Posted by Fsturbo15
I personally think the New LL from novarossi will destroy the OS on a long track.
Its a twin of the mugen x-12, both are long strokes.
The LL has fixed the dreaded fuel economy problem the x-12 has and is a little faster in general.
The NSR is an engine for technical tracks, it has a lot of low end but the LL or X-12 will pull harder on the mid range and top end.
The OS is a good engine for the money but if money isnt an issue, i'd take the LL, there is also a LL mod version at nitrohouse for $350, its a basic mod.
The LL and the X12 are not the same stroke. The NS, NSR, X, and the new N12LS are all the same stroke. The RR and the LL are the longer stroke. The longer stroke engines make more torque, the shorter strokes should make slightly more top.
I personally like the shorter stroke engines better. The X12 is basically the NS 12. According to the paperwork that comes with the engines the Mugen X12 is exactly the same as the NS 12 except the head button and the "writing" on the case and carb. Uriah Murnan swears it has different timing, but does admit that the part numbers on all the internals are exactly the same. The NSR is the same as the NS/X except it has the microcast piston and sleeve.
All of that being said, I have seen a number of the OS engines run and they are quite fast. Our track here is bigger than the track at Revelation and they have no problem keeping up. The only thing waiting to be seen is how well it holds up. No problem on horsepower.