BearSa,


I must add that the #3070F/R GRFT/GRRT engines are the NEWER pylon racing engines that MVVS had to offer - not the old ones.

The old version was the #3065 GRRT, which was essentially the basic #3066 .40/6.5 cc engine, with a closed front crankcase and a rear-intake...


The #3070 versions were discontinued as well, because of very low sales - not because of any performance deficiency.

I believe your engine has a needle bearing con-rod - unique even in specialty engines like this one.