As a newbee to blatchat, please forgive me if there is already an answer out there but I cant find one. I have a 2012 140 Supersport (1.6 Sigma). When I first built it I did have vibration trouble as only one wheel had been supplied balanced. Thanks Caterham. Having had them all finely balanced, all was well until I did a track day. From about 85 mph I get a fairly solid vibration that doesn't feel like wheels so am wondering about propshaft balance. The shaft has one balance weight at the diff end but nothing at the front end. I also suffer a small oil leak from the gearbox extension housing seal which didn't go away when I replaced the seal. Can anyone out there give any words of wisdom re prop balance and whether this could influence the seal leak. Thx
