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Wiseco Pistons

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I am getting ready to rebuild the top end on my 2008 450 SX-F. I see that Wiseco makes to different sets of pistons for my bike, there are 12.2:1 and 13.5:1 compression ratio versions. Does anyone have any experience with either of this pistons versus the KTM OEM parts. Any information or input would be greatly appreciated.

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Wiseco is the leader in replacement pistons. Oem pistons are great, but with a wiseco not only will you gain more performance you will also see very accurate tolerances for a smooth running machine and you can also expect a great life expectancy out of any of their products.

You can expect to notice an improved powerband if you raise the compression while remaining on premium pump fuel. Dollar for dollar, raising the compression is about the best bang for the buck you can get.

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I put the 12.2:1 in my bike at the start of the season and it has been great so far.

Dont hold me to this but im pretty sure if you use the 13.5:1 you will have to run race gas to run properly, you will get more punch out of your engine but I just couldnt afford race gas with the amount of riding I do.

EDIT: If you go wiseco make sure you let your engine warm up till ur radiators are warm to the touch before you go riding. One of the main causes of premature failures is improper warm up wehre as the OEM/Cast pistons do not need this.

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I have about 13 hrs on a Pro X 13.5:1 Piston with no probs yet. Didn't notice a difference in power from stock nor do I need to run race gas.

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good to know, my buddy put one in his CRF250 and while he didnt have detonation issues it ran like shit even with rejetting till he used race fuel. Every beast is different i guess! Sorry for the misinformation.

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Thanks for all the input, it sounds like a Wiseco is the way to go. One more question, does a 13.5:1 compression ratio effect the dependability of the lower end versus the 12.2:1 ratio.

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I believe the stock piston is 12.8 so 13.5 is not that big of a jump. I'm running premium with a 13.5, no detonation.

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I just went to a 13.5 High Comp in my 2010 450 SMR and it made exactly 1 HP more!!!!! From 56 hp to 57 hp 4th gear roll on.

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I bought the bike used so I cannot be sure how many hours were on it at the time of purchase, I only have about 40 hours on it since then. The lower end seems tight so I think I will go with the 13.5:1 compression ratio piston.

Thanks for the help.

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I have used both the std and high compression Wisecos in MX/SX race 450SXF's back in 07/08/09 They worked perfectly and gave no issues. The Hi comp was a bit much for some of the riders, the Power hit a little too hard for the rough tracks. HP wa up @ 1-1.5 HP

Way cheeper than the OEM piston.

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I have used both the std and high compression Wisecos in MX/SX race 450SXF's back in 07/08/09 They worked perfectly and gave no issues. The Hi comp was a bit much for some of the riders, the Power hit a little too hard for the rough tracks. HP wa up @ 1-1.5 HP

Way cheeper than the OEM piston.

I just ordered a Wiseco set up this morning, man you are correct way cheaper than the OEM unit.

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