https://forum.cmraracing.com/ Central Motorcycle RoadRacing Association Forum en Tue, 02 Jun 2026 10:52:32 GMT vBulletin 60 https://forum.cmraracing.com/images/misc/rss.png https://forum.cmraracing.com/ https://forum.cmraracing.com/showthread.php?40212-FS-Kramer-GP2-890R-(Fully-sorted-speedbox-built)&goto=newpost Sun, 31 May 2026 11:49:06 GMT If you’re looking for a GP2 that’s already been taken to the absolute limit of what a single‑R chassis can deliver, this is it. I’ve owned this 2020 GP2 since 2022, and the majority of the upgrades and maintenance were completed over the last two track seasons. Bike is in excellent condition and needs nothing. Only selling because I’m moving to an 890RR.

This build uses nearly the entire Speedbox catalog ($9000 in speedbox parts alone, labor not included), and the difference is night‑and‑day—faster spool, sharper response, stronger top‑end, and dramatically improved cooling efficiency. It’s the most dialed‑in GP2 you’ll find without stepping into RR territory.

Performance & Engine Upgrades

• Speedbox Stage 1 inlet camshaft (+7 hp) $1800
• Speedbox airbox trumpets for Stage 1 cam (+2 hp) $250
• Speedbox upgraded airbox kit $940
• Speedbox super‑light alternator (massive improvement in spool‑up) $1800
• Speedbox ECU tune $450
• New clutch pack (by Kramer)
• Valves checked (by Kramer)
• Thermostat deleted (by Kramer)
• Suspension refreshed (front and rear) (by Kramer)

Cooling & Reliability

• Speedbox oil cooler (installed by Kramer) $2200
• Speedbox large water pump (installed by Kramer) $620

Controls & Ergonomics

• Speedbox quick‑turn throttle (55° throw – similar to 890RR, transforms the bike) $250
• Speedbox road‑shift lever (GP shift is default; road lever included) $230

Aero & Protection

• Speedbox aero fairing plate (reduced drag) $150
• Melotti Racing AIM dash crash protection

Other Notes

• I’ve run this bike at COTA three times and I’m faster on it than my Ducati V4S. With the full Speedbox setup, this GP2 is about as optimized as a single‑R GP2 can get. The lightweight alternator + quick‑turn throttle combo makes it spool instantly, and the Stage 1 cam adds real top‑end power (+7–8 hp).
• Mileage will be updated soon (bike is stored at my track garage).
• No additional spares included beyond what’s listed.
• Pickup only – DFW area.

If you want a GP2 that’s already built right, already sorted, and already proven on track, this is the one.

ASKING $21,500.













Photos here: https://photos.app.goo.gl/36qXSFyzFv8hJ3Hq5 ]]> For Sale / Want Ads Ash Nara https://forum.cmraracing.com/showthread.php?40212-FS-Kramer-GP2-890R-(Fully-sorted-speedbox-built)