Automotive Parts and Accessories: HONDA TRX400EX 400EX 89MM 440CC BIG BORE CYLINDER PISTON GASKET KIT SET - Glenparts
Automotive Parts and Accessories: 1999-2008 Honda TRX400EX - Big Bore 440cc (11:1 Hi-Compression) ATV Engine Piston Kit - Namura
Automotive Parts and Accessories: Wiseco Big Bore Replacement Gasket Kit HONDA TRX 400EX TRX 400X XR400R - Wiseco
Automotive Parts and Accessories: 1999-2008 Honda TRX400EX - Big Bore 440cc (11:1 Hi-Compression) ATV Engine Piston Ring Kit [Bore Size (mm): 88.95] - Namura
Automotive Parts and Accessories: 99-04 HONDA TRX400EX: Big Gun Rev Box (BLACK) - Big Gun
Automotive Parts and Accessories: HONDA TRX400X 400X 89MM 440CC BIG BORE CYLINDER PISTON GASKET KIT SET - Glenparts
Automotive Parts and Accessories: Wiseco (CK140) 89.0mm 12.5:1 Compression 440cc Overbore Re-Sleeving Kit - Wiseco
Automotive Parts and Accessories: Athena (P400210100017) 100mm 490cc Big Bore Cylinder Kit - Athena
Automotive Parts and Accessories: TRX 400EX Replacement Clutch Kit (all years) - Artrax
Automotive Parts and Accessories: HONDA TRX400X 400X 89MM 440CC BIG BORE CYLINDER PISTON GASKET KIT SET - Glenparts
Automotive Parts and Accessories: Factory Spec FS-201 2" Aluminum ATV Wheel Spacer - Factory Spec
Automotive Parts and Accessories: 2001 Honda TRX400EX Sportrax Piston Kit (Big Bore) - 0.25mm Oversize to 85.25mm, 9.3:1 Compression, Manufacturer: Pro-X, PISTON KIT XR400R/TRX400EX .25 - Pro-X
Automotive Parts and Accessories: 1999 Honda TRX400EX Sportrax Piston Kit (Big Bore) - 0.50mm Oversize to 85.50mm, 9.3:1 Compression, Manufacturer: Pro-X, PISTON KIT XR400R/TRX400EX .50 - Pro-X
Automotive Parts and Accessories: 2006 Honda TRX400EX Sportrax Piston Kit (Big Bore) - 1.00mm Oversize to 86.00mm, 9.3:1 Compression, Manufacturer: Pro-X, PISTON KIT XR400R/TRX400EX 1.0 - Pro-X
Automotive Parts and Accessories: Wiseco 4667M08900 89.00mm 11:1 Compression 435cc ATV Piston Kit - Wiseco
Automotive Parts and Accessories: 2008 Honda TRX450ER Electric Start Big Bore Cylinder Kit (490cc) - 4.00mm Oversize to 100.00mm, Manufacturer: Athena, CYLINDER KIT BIG BORE HON - Athena
Automotive Parts and Accessories: 2008 Honda TRX450ER Electric Start Piston Kit (490cc Big Bore) (A) - 4.00mm Oversize to 99.95mm, 11.6:1 Compression, Manufacturer: Athena, PISTON KT "BIG BORE" - Athena
Automotive Parts and Accessories: Athena Piston Kit (490cc Big Bore) (A) - 4.00mm Oversize to 99.95mm, 11.6:1 Compression S4F10000007A - Athena
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Trx 400 Big Bore Popular Q&A
Q: How much will a 416 bore kite effect a trx400ex?
A: With a 416 bore kit you can expect Gain of 3-5 HP from its JE Piston Read More »
Q: What is faster trx 450R or a big bore trx 440EX?
A: The top speed of a Big Bore 440EX reported has been 75mph, but you Read More »
Q: How do you make your 400ex with stage 2 hot cams and a big bore k...
A: fix the jack underneath the car and charge the spark lines, hope it helps! : Read More »
Q: How fast is a honda 400ex with a 440 big bore kit and pipe?
A: The 440 is a great power add but even with the bigger head studs, it will blow the head gasket if ridden hard for any length of time. report this answer. Update... Read More »
Q: I have a 2000 Honda 400ex, how much more power would a 440 big bo...
A: You should expect about a 10% increase in torque with just the big bore kit, with the cam and carb, along with some flow work in the port of the head, horsepowe... Read More »