The fuel tank is from a Honda GX140 Engine, normally fitted to plant equipment such as generators / water pumps etc. It mounts very securely, bolted into the std tank bolt hole at the head stock, with a supporting bracket which locates on the frame cross member. I reckon its secure enough to actually ride the bike with it on, not been down the road yet though. Would make plug chops on the rear cylinder easier.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30