peejay4A Posted December 9, 2012 Report Share Posted December 9, 2012 Microbore central heating pipe is 8mm or 5/16". I don't think it goes smaller than that. Quote Link to post Share on other sites
stuart Posted December 9, 2012 Report Share Posted December 9, 2012 Most good Motor factors will keep 1/4" and 5/16" copper piping. Be aware that if you route the fuel hose around the rear of the engine that you will have to alter the carb float chamber inlets as well. Stuart. Quote Link to post Share on other sites
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