Board Track Racing Kit

Nice to see my old thread getting bumped back up. I have had excellent luck with the Grubee engines. No major problems at all. I run my own custom intake with modified expansion chamber, basically full port flanges and these engines run pretty strong. Lately I have moved away from the stock frame configurations and into the loop and stretch and loop designs, but my Sportsman Flyer number 1 is still running strong. We only have about 10 miles on the first Morini build but it appears to be a strong engine and is very high quality. As for the rear drive you mentioned Egor, and it taking a pounding, I am not quite sure what you mean. I have seen the rubber insulated rear sprockets on some motorcycles but so far I have had excellent luck with the hub adapter type rear sprocket mounts. I am now also working with rear drum brake hubs that are designed from the start with a fixed 45t motor side sprocket and freewheel bicycle side sprocket. These new hubs seem to be an excellent solution and are very durable. When I run the China two stroke I always use the CNS carb and find it to be much better than the stock carbs.
Pat