Thumper Racing 280 | GT Raceway

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WR250R/X-280 - ThumperRacing

https://www.thumperracing.net/index.php?route=product/product&product_id=97

In the end we decided to stick with a 280 kit, the reason for this was simple: Doing a 290 kit made the piston too heavy. Keeping the kit a 280 gave us a piston weight that is 8 grams heavier than stock. If we had gone with a 290 the piston came in at 28 grams heavier which you could feel in the higher RPM's.

280 BBK PISTON - ThumperRacing

https://www.thumperracing.net/index.php?route=product/product&product_id=399

XR250R to 280 - ThumperRacing

https://www.thumperracing.net/index.php?route=product/product&product_id=72

Price: $231.00. Stock, the XR250 is a proven trail bike. With upgraded suspension, more power, and quicker reponse, it bridges the gap into a serious raceable motorcycle. This kit uses a 77mm piston. This is as big as it gets allowing one overbore. This noticeably improves the overall power output from bottom to top.

ThumperRacing

https://www.thumperracing.net/

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2010 CRF250-280 Big Bore Kit - ThumperRacing

https://www.thumperracing.net/index.php?route=product/product&product_id=261

The 280 kit can be can be installed by your average mechanic in an afternoon. Thumper Racing does the sleeve install and plating then the returns the reworked cylinder for installation. We have core cylinders available for exchange to make it even simpler and reduced your down time to an afternoon of install the kit.

Thumper Racing 280 Big Bore kit Long Term Experience?

https://wr250rforum.forumotion.com/t6806-thumper-racing-280-big-bore-kit-long-term-experience

Fri Jan 24, 2014 1:01 pm. No, picking it up now. I did see the dyno sheet on the 280 kit. 43% improvement in torque at 5k over dead stock so the airbox and header gains are included in that. The performance gains mirror the 290 Athena without the increase in vibration that most 290 users report.

Thumper Racing 280 kit - WR250F/YZ250F/YZ250FX - ThumperTalk

https://thumpertalk.com/forums/topic/19074-thumper-racing-280-kit/

YZF250 pigged, heres a useful address www.thumper-racing.net 🙂

For sale WR250R Thumper Racing 280 Cylinder & gaskets

https://www.advrider.com/f/threads/wr250r-thumper-racing-280-cylinder-gaskets.1542621/

Cylinder is in decent condition but still has some pieces of the old cometic gasket I couldn't quite remove. I don't have a new piston/rings for it, you will need to contact Thumper Racing (or now builtmotors.com) for that. I still have the piston box for reference it is a carrillo piston model CPMX1067C. $280 plus a little for shipping to CONUS

Frank's Yamaha WR250R Dyno Tuning Adventure - Dual Sport …

https://dualsportalchemy.com/franks-yamaha-wr250r-dyno-tuning-adventure

Our conversation continues toward me eventually installing a Thumper Racing 280 big bore kit. He tells me he’s never heard of Thumper Racing. I look down into the glass display case between us and, bigger than life, a custom part of some sort with the words Thumper Racing engraved into it. Keep in mind that this is not only the tech, he also ...

280 big bore kit - XR250R & XR400R - ThumperTalk

https://www.thumpertalk.com/forums/topic/1146866-280-big-bore-kit/

The 300 kit from thumper racing uses compression ratio that is lower than stock... It revs faster than a 280 kit. The 280 kit has higher compression - this moves power lower in RPM range - but bike loses a little rev. Going to a 300 requires splitting the cases so that they can be bored to accept a larger sleeve.

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