Well, my GRP .21 dropped the bottom of the piston after about 3 gallons this weekend It was a good motor for fuel mileage, but simply did not have enough bottom end poop for truggy after everything I tried. Tried stock 2053, JP1, JP3, and settled on 2035, and up in spur down in pinion.

So long GRP, it's been a fun venture, but I need more bottom end poop for my truggy.

Anyone that would like some GRP parts PM me. I have a 2053 pipe Case, Carb, Back plate, Crank, and Head that will go to eBay shortly. I'll gladly sell here first. Let me know what you are interested in I can send you pics we can talk price.