I do not have a Triumph, but the BSA is similar in this aspect. I can not fill up with leaded petrol any more in our village. So here I add a liquid lead substitute, which I buy at the local BP petrol station. When I fill up during a ride (usually appr. 13 liters or appr 3.xx gallons) I do not use the substitute. I never noticed anything different. Why did my exhaust valves sieze, some will ask (I wrote about this a week ago). I'm convinced that this had nothing to do with the fuel, but with to narrow tollerances on clearence between valve stem and guide bushing, yes or no in combination with an oil flow problem (still to be checked). Why the lead substitute than, at home? Old habits I think. I had four air cooled VW Beetles as well. Same basic design of head and valves, same story. So I think your Triumph can run without a problem on unleaded fuel.
Re: How do classic Triumphs run on unleaded gas?#88796 03/08/0611:32 am03/08/0611:32 am
A Triumph with an alloy head is ok on unleaded fuel, apparently. I put some stuff in the fuel anyway for some reason, peace of mind I suppose. What is important is to not use too low an octane rating. I use the 98 stuff normally but the 95 doesn't seem to make any difference (650 TR6R). You can make a bike pink or ping if you try hard enough. Opening up at low revs is a good way. A triumph twin is a bit of a revver really, it's not supposed to sound like a Harley or a couple of B31s, so if you let it run naturally it will be fine.
An iron head Triumph requires an additive because the seats are different.
Re: How do classic Triumphs run on unleaded gas?#88797 03/08/0612:32 pm03/08/0612:32 pm
There were some urban folk tales during the introduction of unleaded fuels about valve damage to vintage bikes without this or special metal on the valve seats or valve faces, but for the most part they have not come true. Some people modify their ignition timing by 1 or 2 degrees, but as long as you run high octane fuels you're usually good to go.
Don't hide 'em, Ride 'em !!
RF Whatley Cornelia, GA
"Shop Boy" at Rodi British Bikes
Re: How do classic Triumphs run on unleaded gas?#88801 03/08/066:35 pm03/08/066:35 pm