manwhore said:anything over 10.5 to 1 you are going to need to run a higher octane gas or take some timing out of the bike or it will ping
hey your tb kit is a 13:1 piston when used with a stock 50 headJetster220 said:Practically all 88 kits only need premium as they arnt more than 11.5 to 12.0:1 compression. Reason that kit probably needs race gas is because being a 72cc kit and fast 50's saying it will run with 88's means that they are using really high compresion, proably around 13 or so, which is why they say it needs race gas.
cyclerider57 said:I hate to break it to you Kaos, but it is not necessary to run race fuel on anything over 10:1. On a 50 it wouldn't make a difference anyway. We are talking a 2.5 hp motor. Even if you have a kit that bumps it to 10 hp and 12:1 compression it is only an option. I would sugest that you run high octane pump or a 50/50 mix. Compression is not the only thing that determines what octane you should run anyway. I am sorry to say it, but oldschool is not the only one that doesn't run race fuel. I know many people that run over 10:1 on premium. It is only an option, not a necessity.