I have 3 of the 121vr for the past 2 years and they are awesome. Even when my rod went and destroyed the sleeve, piston and the crank I sent it into Reedy and they replaced everything and sent it back to me within 2 weeks and have run it in my buggy since then for the last season and a half. They are great and besides the one problem haven't had any since. Great power with the right pipe and the fuel milage in my buggy and truggy are awesome. Nothing but great reviews from me on this engine and I came from running O.S. Vspecs.