piston rod valves
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  1. #1
    Junior Member Rookie
    Join Date
    Jul 2018
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    5

    piston rod valves

    good. i am doing a review on my 450 sx engine.
    I will change connecting rod, valves and piston. what material do they recommend? prox would be a good option?

  2. #2
    Senior Member KTMATVHQ Addict
    Join Date
    Feb 2008
    Location
    wildomar, socal
    Posts
    566
    Get the pro-x rod. I have had luck with the stock valves. I have used stock, wossner 13.5:1, and wiseco 13.5:1. I got great life out of all three of them. The wiseco finally cracked but it had a great amount of use. I also had used CP pistons once on it, and I had poor luck with them cracking early. But I had great luck with them on the ltr450 and my brothers trx450r.

    Also use stock gaskets. Don’t be cheap. And also get a DJH manual cam chain tensioner. It helps deliver more oil to the head.
    2009 KTM 505sx, Baldwin engine, Full P.E.P., Walsh: arms, subframe, stem, Quadtech seat and hood, Rath Signature nerfs, KTM Bill shorty exhaust, Hinson clutch, KTM orange bling, Idol Speed holeshot device, Precision Pro stabilizer, Renthal bars.

  3. #3
    Junior Member Rookie
    Join Date
    Jul 2018
    Posts
    5
    Thanks for the information

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  5. #4
    Senior Member KTMATVHQ Guru
    Join Date
    Dec 2008
    Location
    Billings, MT
    Posts
    1,083
    Go with the OEM Del West valves. KTM sells a valve kit with new springs for the bikes with this engine (450SXF 2009-2012) that would probably be the most economical. Pro-X rod and crank pin bearing are good. I used a Carillo rod with the Pro-X pin and bearing in my last rebuild and had Thumper Racing balance the whole assembly with a new CP piston. Noticeably less vibration than before. Stock piston is best for longevity. I've run a few CP 13.5:1 pistons through my 505sx. Changed them before the 50hr mark except one I ran to 64hr and it cracked. The 505 uses a bigger wrist pin so even the stock ones are prone to crack after while. I also recommend the DJH manual chain tensioner.
    Mine:
    2017 Husky FX 450
    2009 505 SX
    2008 525 XC-modded for mx (currently 450 cylinder)
    Dad's:
    2009 450 SX
    2008 540 XC


 

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