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    Rear thumb brake - diameter of standard forks?

    Hi All I work over seas so don't have access to my RC390 right now, but im looking to order a rear thumb break for when I get back home, have a track day 3 days after I arrive. could someone help me out by measuring the diameter of the top of the fork leg, just below the top yoke ? so that I...
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    HM GP quickshifter and RC390 Cup WP Forks

    HM GP Quickshifter the top dog ! will require a input from speed sensor to unlock all the features (i used input from rear ABS) - £350 posted to UK RC390 WP competition forks - sprung for a rider of 80Kg - £650 posted to UK Slight damage to the top of both forks from clip ons.
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    new RC390 cup owner - track toy

    Hi All. i purchaced a RC390 Cup off ebay during lockdown here in the UK (May 2020) and set about tuning and setting it up and painting it. i got a couple of trackdays in before the weather got to grim. it has some trick goodies like a HM GP quickshifter (up for sale) and a HM M3 dash, and is...
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    Rc390 coolent temp male fitting type ? any help?

    Hi all New member, fixing up a RC390 for a track bike. i have a broken Male coolent temp sensor (to the back of the block), does anyone know the type of connector this is ? (so i can buy a new one without buying a loom. attached a photo of the female (i need the plug that plugs into this)...
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