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Thread: 400ex stroker piston

  1. 10-19-2018, 08:59 AM #1
    randallp1
    randallp1 is offline Registered User
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    400ex stroker piston

    I知 running (trying to run) a 460 stroker. When I purchased the engine the whole top end was off bc the seller burnt up rings running methanol. He told me it was a 13 or 14:1 compression piston. JE or vertex sold the piston so I ordered new rings. After rebuilding the engine (rings in correct orientation) the oil blow by was unreal. So now I知 looking for a new stroker piston kit with 11:1 or so. All I知 finding is 9.3:1 pistons. Is there a noticeable big difference between to 2 ratios? Thanks for your time, Randy.
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  2. 11-02-2018, 07:10 PM #2
    DragonGunner
    DragonGunner is offline Registered User
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    A stroker piston will create 1 more compression...so a 9.3: 1 would create 10.3:1 compression. It is what Powroll back in the day told me. Never did the stroker kit, as explained to me it will only gain about 1 to 2 hp more, not worth the $$$$.
    1984 Honda 200M ATC
    1985 Honda 200X ATC
    1986 Honda 200X ATC
    1999 Honda 406EX....11:1, Web Cam / Hardened rockers. Ported. WB CDI. CT Racing header. WB E-Series slip on. Lonestar swinger.
    2001 Honda/KTM 520 Hybrid Quad. Its like a 400EX but twice the horsepower.
    2014 Artic Cat Wildcat Trail XT
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  3. 12-04-2018, 08:27 PM #3
    atvrider13
    atvrider13 is offline Registered User
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    Cp makes a stroker piston in higher compression ratios than vertex. They are on ebay
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