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    for sale in socal, 2015 RC 390 Cup plus extras

    Sold. For sale. A Cup bike with supersport engine built by GreyArea and upgraded suspension (GP fork inserts, Penske shock) for unrestricted spring rate selection. Rottweiler fairing stay, KOSO tach so you can actually see the rpm!, there is space for OEM display below the KOSO tach if you want...
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    sold socal 2015 Cup Engine

    this is sold the engine is located in southwest Los Angeles. (i haven't priced shipping but figure at least $100, so local sale is preferred), $750 The bike it came off was sold as 'new' from dealer in late 2019; used by the importer for media events. I ran one track day and it ran fine, but...
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    have you tried a 16x18 MC?

    i have a 16x18 brembo MC in the drawer from another project that never got used. my bike is a '15 cup version with the larger brake rotor. has anyone used this MC? the general advice is the rcs15 which i presume is comparable to a 15x18 to 15x20. so this would produce a little less lever...
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    have you experimented with stiffer suspension?

    I ordered suspension for my weight and application. (200lbs plus gear, track day only), and the spring rates chosen for me were 0.8n/mm forks and a 750lb/in shock spring. The damping seems fine for now, but on power steering seemed 'stiff'. the shock is at 310mm and the forks at flush with the...
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    is there a special part number for cup bike fork seals?

    hello, like the title suggests, I have a fork seal weaping, and can't find replacement part numbers for the cup bike fork. I know the externals look similiar but are the oil/dust seals interchangeable? This does seem like something I should be able to answer with an online search, but...
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    Alternative display installation

    hello, instead of adding a 2nd display, I would like to replace the '15rc oem display with a koso tach, the power and rpm are sorted, but would like to get the neutral light to function. has anyone found a solution? does the oem display use a compatible signal or do i need a relay or something...
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    Please identify these bits in the engine oil

    I have 1 (abbreviated due to high afternoon winds) track day on the engine, but the oil looked fairly dark. Upon draining the oil and removing the screens there was what appears to be a plastic tooth like shape and debris (paint chips) on the larger screen, and maybe loose sealant on the smaller...
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    Is this part of the EFI or ?

    I had the fuel tank removed to install a PCV, and angled the battery box back to sort thru the wiring and saw this black box just behind the coolant recovery tank. (see attached pic, taken from the right side, the coolant recovery tank is removed) At first I figured it was the vapor recovery...
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    Tyga header length

    How does the tyge header length compare to the stock ktm header? Is it possibly slightly longer? I have a '15 with akra exhaust with both midpipes. The bike came with the catted midpipe attached on the front face of the frame tab with nearly max overlap on the header. The open midpipe...
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    how to remove akra baffle?

    hi, i have one track day on my (new to me) bike, and surprisingly the exhaust is too quiet. I tend to shift by ear, and would like to hear the exhaust note. looking at the dbkiller install, it looks permanent. has anyone been able to remove and reinstall the akra dbkiller? if so, how? thanks...
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    '15 cup suspension mods

    Hello, I just purchased a '15 cup bike with 1mile on the odometer.(KTM had used it for a media event, this one had the least amount of rash) my intent is to use it for track days and club racing in the Sr group (I'm 60+). the front end seems stiff compared to the rear. the sag front/rear from...
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