Main Motorcycle: 1970 Triumph T100C
Join Date: Aug 2007
Location: Coastal Virginia
Other Motorcycle: 2000 NTB
|Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.|
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The craze for special valve seats that would work ok on unleaded petrol was a con, and a surprising (and disappointing) number of engineering firms sepcialising in 'classic' cars & bikes cashed in on people's fears. If you were running an old iron-head bike or car, maybe it would benefit from (or in some cases definitely need) new steel seat inserts to replace the existing iron seats, when switching to unleaded. Otherwise, there's nothing to gain and a lot to lose (a fair bit of money, and the risk of loose seats in the future). The additives might act as anti-knock agents but unless running unusually high compression, there shouldn't be any knocking/pinking/pinging or whatever you call it on straight superunleaded. On straight ordinary unleaded there might be some pinking on heavy throttle openings, but it should be avoidable with careful riding.
Standard compression for your bike was 8.5-1 so you may get away with normal unleaded. Try it, if the old girl pinks go for a higher octane.
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