Pro-X Piston Kit (Big Bore) - 0.50mm Oversize to 66.50mm 0283

Pro-X Piston Kit (Big Bore) - 2.00mm Oversize to 68.00mm 0288

Pro-X Piston Kit (Big Bore) - 1.50mm Oversize to 67.50mm 0641

Pro-X Piston Kit (Big Bore) - 1.00mm Oversize to 67.00mm 0286

Namura (NA-10010T) 79.96mm Top End Gasket Kit

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Honda Trx250 Big Bore Kit Popular Q&A

Q: How much faster will a honda 300ex go with a big bore kit?
A: A Big Bored kit will produce small boost in throttle response for a... ...MORE... Read More »

Q: How fast will a Honda CR125R with a big bore kit on it go?
A: The best way to increase displacement is to increase the 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: Does anyone know were to find a big bore kit for my 2007 trx 250e...
A: Try Pep Boys or Johnny Jingletree's Goodtime Car Expo in Chicago, Illinois. Read More »

Q: Quad bore-in out my Honda trx250ex?
A: I have the same exact bike only its a 2007, right now I'm looking into the FMF Powercore 4 exhaust, it will fit the bike and gives it more hp. It's about $215 d... Read More »