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Thread: Trx250r piston

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    Trx250r piston

    Hi guys I have blown my piston is there different pistons for the long and short rod engines. My engine is long rod I bought a trx piston but gudgeon to gudeon the piston I've taken out is quite a bit taller that the wiseco I've bought for it. Could the damaged piston be a yz250 piston if so what year of piston would it be thanks

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    Racer Langbolt's Avatar
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    Does the OLD piston you took out have a boost port on the intake side ? ('87-89 style) or a half moon a the bottom of the skirt ? ('86)

    A 'YZ piston starts at 70mm and requires a 2mm spacer plate.

    Do you know the year of your Cylinder ? '86 is wide open intake..... '87-89 has the vertical bridges.

    Maybe take a pic or two and we can get you sorted out


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    Hi langbolt these are pics of old and new id be grateful if you could shed light on where I have gone wrong thanx

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    Racer Langbolt's Avatar
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    Looks like the OLD one was an OEM Honda Piston from an '86. ART made the pistons for Honda.

    The New piston has the Boost port found in the '87-89 series Pistons.

    Sorry Mate, You're gonna have to get an '86 style piston to solve your problem.



    Please take a pic of the INTAKE of your Cylinder.....just want to confirm you have an '86 Cylinder too.

    Did you buy a W562 instead of a W526 ?



    Are you sure it's a long rod ??? What is Stamped on the beam of the connecting rod ? KA4 is Short rod 125.5mm & HA2 is long rod 130.5mm

    http://www.eddie-sanders-racing.com/...od%20125.3.htm

    http://www.eddie-sanders-racing.com/...od%20130.3.htm

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    Thanks for your help it is running a Base plate and double gaskets when I stripped it. I bought 2 rebuilt engines one of which was ct 330 the other was supposed to be a 1988. From what I see it's more of a 86 piston I will get more pics tomorrow thanks again.

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    Racer Langbolt's Avatar
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    Sounds like an Long Rod '86 Motor.....SO the Piston & Cylinder are from an '86 and the Connecting rod is from a '87-'89 which requires the 2 Gaskets & 0.190" Space Plate to take into account the change in piston pin height between those years,

    If the Cylinder is a '88......then just run that NEW piston you have with 1 base gasket and NO SPACER PLATE.


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