Automotive Parts and Accessories: Namura NA-10004 Standard Big Bore Piston Kit for 400 EX-440cc - Namura
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Automotive Parts and Accessories: 1999-2008 Honda TRX400EX - Big Bore 440cc (11:1 Hi-Compression) ATV Engine Piston Kit - Namura
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: Wiseco (CK140) 89.0mm 12.5:1 Compression 440cc Overbore Re-Sleeving Kit - Wiseco
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Automotive Parts and Accessories: Wiseco PK1041 89.00 mm 11.0:1 Compression ATV Piston Kit with Top-End Gasket Kit - Wiseco
Automotive Parts and Accessories: Wiseco 4794M08900 89.00mm 12.5:1 Compression 435cc Piston Kit - Wiseco
Automotive Parts and Accessories: 2007 Honda TRX400EX Sportrax Ring Set - 85.00mm, Manufacturer: Wiseco, 3347XC REPL RING, HON - Wiseco Piston
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400Ex 440 Big Bore Kit Popular Q&A
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 »
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: What do you need to get to make I stock 400Ex top end a 440 big b...
A: Wiseco sells a big bore kit, but you nee... Read More »
Q: What is the biggest bore kit made for a honda 400ex?
A: i believe you can go 8mm over stock bore but im not one hundred percent my machanic did mine and he said a 4 over was the best bore for one. Read More »