Are the stem seals only at 1000 miles as well?
The seals in my OZ bike are at roughly 60,000 and could use replacement now. They were good until recently but have now started to let oil through when above 4000 rpm. These are different seals to those sold by the Spares Co.
I pulled the heads to fix a loose exhaust valve guide at about the 52k mark. There wasn't a whole lot of carbon in there, even with a few thousand miles running too rich with worn out carbs.
Also took the 1360 engine apart at 1500 miles, all clean in there barely any signs of combustion on the piston tops.
Those are a different seal type again, Terry's seals. I should ask him about that! Have the numbers for the D Smith/J McDougall seals but not the T Prince ones, which Bill must have.
Terry puts seals on the exhaust as well. Doesn't seem necessary as the Vincents here on the West coast are using intake only seals and it works just fine.
When the top end was fairly new I used 8 ounces of oil going to California and back, 2700 miles.
Thats better than the 1 Imperial gallon per 1500 miles as considered normal oil consumption in 1950 ( Riders Handbook)
Glen