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I have a Cup bike, race track only. They don’t have a working speedometer/ odometer because there are no ABS rings on the wheels, no associated sensors or wiring connected the the ECU. As a consequence the ABS light on the dash is always lit. This is normal, as there is no ABS. I’d sort of like...

It seems that a great deal of though, effort and money has been spent on trying to improve the RC’s “deficient” cooling system. SPAL fans, upgraded radiators, even auxiliary electric water pumps. My operating theory at the moment is that these might be solutions in search of a problem. My Cup...

I want to put a side stand on my Cup/ Track bike. In order to do that I need the boss on the footpeg bracket that's appropriately angled to mount the side stand. Anyone out there have a broken/ bent/ cracked/ scuffed/ thrashed/ crashed left side footpeg mount? I don't need the footpeg or...

Wanting to install a small round 2.5" tach on my 2015 Cup. Typically these aftermarket tachs have a green wire that's the sensor or trigger wire. The tach is powered up and properly wired, except it doesn't read rpm. I tried to connect the green wire to the coil ground as suggested for typical...

VGC, no major scuffs, warts, especially to the CF heel guards. The scratches on the anodizing will be covered by the bolts/ washers. As best I recall, these are the race version, with no side stand provision. If you're using these on a street bike, you can purchase the STAH-0047C Sidestand...

$55 shipped, or trade for a set of 7.4 springs. I have a set of 7.8, want to try a lighter spring. Or perhaps keep a 7.8 in one leg, run a lighter spring in the other. Don't know what rates are available below 7.8, but I think it's 7.4 Would even consider a spring set lighter than 7.4, I'd just...

Wikipedia gives the following numbers- Duke Rake, Trail- 25°, 100 mm (3.9 in) Wheelbase- 1,367 mm (53.8 in) RC 390- Rake, Trail- 23.5°, 89 mm (3.5 in) Wheelbase- 1,340 mm (53 in) I thought both bikes used the same frame, but I'm open to correction. So these dimensional difference are the...

I’m not a suspension expert by any means, nor do I have a degree in fluid dynamics. But I’ve been involved in motorcycles for a while, I’ve done forks swaps, had forks revalved, etc. I’m not writing this to provoke responses, but trying to pay it forward. I wished I’d had access to this...

It amazes me that a motorcycle with a marginal cooling system has so many obstructions to air passing through the radiator. I've disassembled my bike to make modifications, and there's rubber everywhere! I searched extensively, and the only thing could find was a suggestion by someone who...

I’ve searched extensively on this forum, the duke 390 forum, and the internet at large, but still have some questions. There is surprising little in the way of real information, other than complaints about how difficult it is to access and remove the unit itself. Please don’t hijack this...