Quick view Honda 1999–2008 Honda TRX400EX Cylinder Boring Service Compare MSRP: $100.00 - $400.00 1999–2008 Honda TRX400EX Cylinder Boring ServiceCommon engine problems are low compression, oil burning, poor performance, or visible cylinder wear.This service will restore compression, stop burning oil, increase horsepower and extend engine life... Choose Options Choose Options Add to Wish List Add to My Wish List Create New Wish List