Telling him my aim was a viscosity of 19. His first recommendation was for any 5W oil until I pointed out that it was the viscosity that was the critical factor as the 5, 7.5, 10W etc bore no resemblance to the viscosity. I contacted Opie Oils for some advice and Tim (very helpful) set about finding me some suitable oil. The Ohlins site however was more helpful giving a viscosity of 19 mm2 Centistokes 40 C. A US site tell me that Yamaha M1 is a zero weight oil but no viscosity figures. The Yamaha manual recommends Yamaha Suspension Oil M1 or Ohlins R&T43.īoth of which seem pretty scarce in the uk. The manufacturers W numbers bear no resemblance to the viscosity. I had already purchased the oil before I sent them off so Ernie put it what I had sent him. They were stiffer than a stiff thing on a stiff day. The searching started when I took my first ride after fitting my newly sealed forks. So I suppose you could say I knew fork oil about fork oil. Before I started researching fork oil I didn't know much about it other than it was oily.
