Thumper Racing Big Bore

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ThumperRacing

http://thumperracing.net/

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Big Bore Kits - ThumperRacing

https://www.thumperracing.net/index.php?route=product/category&path=37

Big Bore Kits Call Us: 775.309.4956 Home Articles Dealers Log In Account Contact Basket Home» Big Bore Kits Browse Products Cylinder Services Crank Services Big Bore Kits YAMAHA Motorcycles Quads KTM/HUSQVARNA Motorcycles Quads SUZUKI Motorcycles Quads HONDA Motorcycle QUAD KAWASAKI Motorcycles POLARIS Quads HUSABERG Motorcycles

XR400R to 440 - ThumperRacing

https://www.thumperracing.net/index.php?route=product/product&product_id=69

Our Big Bore Kit takes the XR400R up to a 440. We have been testing the XR400 since its release. First, we developed the accessories to make the bike handle and work better, which means it's more fun to ride. But you, our customers, wanted MORE …

CRF250-300 Big Bore Kit - ThumperRacing

https://www.thumperracing.net/index.php?route=product/product&product_id=262

We built the ultimate 250 big bore kit. For 2010 the stock cast aluminum cylinder is good for a 2mm overbore (264cc) any larger and you risk cracking a cylinder. For the 300 kit Thumper went back to the drawing board using our Cool Flow sleeve design which increases the water to cylinder contact area by 25% in this kit.

450/525-540 - ThumperRacing

https://www.thumperracing.net/index.php?route=product/product&product_id=58

The stage one gives slightly better overrev power and provides a very good low/mid range power improvement when added to the big bore kits. A stage 2 cam provides a strong mid range power increase. This cam is best suited for more open style riding. The stage 3 cam is best suited for our higher compression and/or bigger displacements.

Big Bore Thumpers - Cylinder Heads

http://www.bigborethumpers.com/heads.html

Big Bore Thumpers - Cylinder Heads Full race porting. Competition Serdi valve jobs. Assembled heads, ready to bolt on and go. Brand new OEM cylnder heads fully assembled with trick racing components. In stock. Stainless and titanium valves, heavy-duty racing springs, titanium retainers... Send us your head or purchase one off our shelf.

Big Bore Thumpers

http://www.bigborethumpers.com/index.html

Fast Times - Desert Racing Series blog by Team APE rider Megan Oblonsky: Team APE - our racer's support program. How to install an APE manual cam chain tensioner. Machining Services - Boring, honing, deglazing. ... Free Big Bore Thumpers decals: Contact information ...

450/525-570 - ThumperRacing

https://www.thumperracing.net/index.php?route=product/product&product_id=113

The stage one gives slightly better overrev power and provides a very good low/mid range power improvement when added to the big bore kits. A stage 2 cam provides a strong mid range power increase. This cam is best suited for faster mx and more open style riding. The stage 3 cam is best suited for our higher compression and/or bigger displacements.

Motorcycles - ThumperRacing

https://thumperracing.net/index.php?route=product/category&path=37_39_284

530 EXC/XCW. Showing 1 to 3 of 3 (1 Pages) 13'+ 290 BASE GASKET. $13.00. 13'+ 290 HEAD GASKET. $17.50. 13+ 290 CLIP SET. $6.00. Showing 1 to 3 of 3 (1 Pages)

500/501 - 590 KIT - ThumperRacing

https://www.thumperracing.net/index.php?route=product/product&product_id=378

Basic kit includes: 102mm Piston kit, Top End Gasket set, Custom Aluminum Big Bore Sleeve installed in YOUR cylinder, Nikasil plated and diamond hone to exact clearances, Jetting Kit if required. For bikes with fuel injection, ECU must be sent into Thumper Racing for reflash to big bore kit. Reflash is $65 extra when purchasing kit.

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