- Big Bore Kit
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440cc BIG BORE Top End Kit 89mm 101 Honda XR400R TRX400EX All Years 1996-2009
440cc Big Bore Top End Kit - 89mm 10:1 Compression Honda XR400R, TRX400EX models, all years. 50 Caliber Racing 440cc Big Bore Top End Cylinder Kit for Honda XR400R & TRX400EX.
Brand new 89mm 440cc big bore kit for Honda XR400 dirt bikes and TRX400 ATVs. This is a complete kit, with everything you need. Improved cylinder design with a larger cylinder sleeve for longer lasting performance. 10:1 89mm Piston with hard anodized dome.
This kit is truly bolt on and can be installed by anyone with basic mechanical skills who is not afraid to turn some nuts and bolts. Breathe new life into your Honda with our high quality, affordable and reliable big bore kit!
50 Caliber Racing Big Bore Kit. 89mm bore size, 10:1 compression.
Designed to re-use existing cylinder head. Free can cooler with every order!
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