Hi mark. I've got a Tune line with maybe 41/2 gals closer to 5 on it and I found it wanting to start backwards and I'll have to bump it a couple of times to change its direction. But lately I have notice a leak or something it looks like its coming from the head gasket but the head bolts are all tight. when this engine is running its really fast and some real good punch with some good run times so what ever it is its not stealing from the fuel to bad. I was reading your thread and noticed you messed with the GRP when they were in production so I figure I ask you about the GRP's.........Thank you.......Bill