A6franz Posted June 6, 2010 I have 110 hours on my '06 RMZ 450 as the second owner - a new wiseco piston (stock size) was installed when I bought it by the original owner. This bike has been awesome and runs strong and still starts 1st kick hot or cold. Obviously with the engine time I am anticipating an engine rebuild and I am considering either a Pro-Circuit High Comp piston or the Athena Big Bore kit. I suppose I could also do a stock Wiseco piston as well. Any thoughts? I absolutely do not want to sacrifice reliability. Motosport is cutting some real deals on these kits but I have heard mixed things about the Athena kits. I run a Big Gun pipe and exhaust. Share this post Link to post Share on other sites
bullshipus Posted June 7, 2010 Big bore kits put too much stress on the stock bottom end such as crank and bearings without changing those too --- to a more heavy duty... I bet you will be sorry in the long run. good luck! Share this post Link to post Share on other sites
darkstar8698 Posted June 7, 2010 I may be wrong but didnt the 06 motors have alot of crank bearing issues to begin with? might not be the best candidate for either of those mods. but again i could be misinformed... Share this post Link to post Share on other sites
Polishhammer Posted June 8, 2010 I would put a 13.1 piston in it and mix half race gas with half pump gas to be safe. Should make more low to mid power. Share this post Link to post Share on other sites
Wiseco Posted June 8, 2010 You could run the Wiseco 13:1 as well. No need for race fuel. Runs great on pump 93 octane. Running high octane race fuel could do more harm than good if you don't need the octane. Share this post Link to post Share on other sites
