Marrs FS 1/4 scales are actually 35cc the stock 30cc that come on the 1/5 scale FS are actually 26cc with 30cc stickers on them took a while but finally got that out of the factory a while back but I am sure the stock FS Marrs 1/4 scale 35cc engines are true 35cc
I wish I had more of the engines left sold out of them when people found out they are true 35cc engines Oneal Racing has worked a few over for some of my customers with great results.
Thank You,
Scott
Zero Gravity RC