Yes good point Mike, re- SAE 20 oil.
Sorry David, I was reading straight off the the spec sheet.
I took my 430 WR to a two day trail ride a couple of weekends ago and I tried (for the first time ) the Penrite Monograde SAE 30 oil in the gearbox.
Well the bike ran fantastic, shifted perfectly and even on the Sunday morning cold start, no problems. I drained the oil out when I got home and apart from a very slight purple tinge, the oil looked good. Happy with the results, I put some more SAE 30 back in.
cheers