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18 Mar 2004
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Gold Member
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Join Date: Mar 2004
Location: Gwynedd, Wales, UK
Posts: 259
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R100 RS (1982) unleaded fuel mods
What modifications do I need to carry out to allow the use of unleaded in my 1982 R100RS, please. As it is, it pinks when I use unleaded (pre-ignition)-is it simply a matter of retiming-if so, can someone tell me the new setting? I'm told that the valve seats should be perfectly OK as the Germans and most of Europe had gone over to unleaded well before the UK did. Following the demise of four-star I've been using LRP and, more recently, an additive, Redex Lead Replacement, but the valve clearances have stayed OK, and neither does it pink.
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Johnefyn
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Johnef
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18 Mar 2004
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HU Founder
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Join Date: Dec 1997
Location: BC Canada
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Unleaded Premium SHOULD be fine, but if it's not, either your heads are coked up thereby raising the compression and the need for higher octane fuel, or you'll just have to retard the timing slightly until it stops pinking. No specific setting, just less advance as needed.
If you do a valve job, you may find that a good cleaning of the combustion chamber solves the problem.
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Grant Johnson
Seek, and ye shall find.
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One world, Two wheels.
www.HorizonsUnlimited.com
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Grant Johnson
Seek, and ye shall find.
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Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com
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25 Sep 2008
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Join Date: Oct 2002
Location: Stockholm - Sweden
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How did it go ?
What did you chose to do ?
Always use the additive for leaded seats when using unleaded fuel.
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Drive Safely,
Albert
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Check the RAW segments; Grant, your HU host is on every month!
Episodes below to listen to while you, err, pretend to do something or other...
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