Originally Posted by
sm4100
Mine runs RP7 under 30-35 Celcius / 65-75% humidity with Byron Gen II 25%/11.(0.6mm head clearance) Lots of torque and good top speed. (OS T-2080 pipe)
Never runs over 96 C temp and the plug lasts very long.
By the way it is very easy to tune, idles perfectly and fires up with just few turns, my starter box battery last days with this engine because I just touch the rubber wheel and it starts so easily.
+1 mine is really running good especially since it is finally fully broken in, first bump and its going and very easy to tune.
here it is with an 8 and Nova "bat" pipe!
http://www.youtube.com/user/Mantisworx?feature=mhee
Originally Posted by
JPFX
Has there been more than one version of the Speed 21 XZ-R?
Like an updated version 2012 model?
Well I will say that the liner that was in my new motor is not the same as the extra one i ordered a month later, new one is much nicer, broke in much better and just runs better in general, I have a little over two gallons and the pinch is till nice and tight.