10-04-2022, 11:00 AM
(09-04-2022, 05:44 PM)Tony Griffiths Wrote: 50 + years ago, when I and friends were doing 15 to 20 thousand miles a year, I can't remember ever doing a "decoke". Depending upon the road mileage between events, I did give the valves a light grind before any competition use - but never bothered scraping off carbon. Perhaps by the 1960s and 1970s oils and piston materials (that combined to reduce wear and blowby) had improved so much that the old decoke routine was no longer necessary. Do high-mileage owners of today find the same thing?
In over 250000 miles of Austin Seven driving since 1990 I have never, ever, done a decoke.