mystery bike

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Hi can anyone help me, I have a gas gas trial bike,engine number F0498024.
On the cylinder it has TR37 stamped,It is fitted with a Mahle piston,which are now unobtainable according to their website! The piston seems to be around 83mm when i measured it roughly. I bought the bike as a 250 ,but im not really sure,
Does anyone have any idea what piston kit would fit this ,and what cc it is
Thanks in advance

 

[Caravan Monster]

Maybe try the gas gas section on trials central http://www.trialscentral.com/forums/forum/7-gas-gas/ Mostly enduro bikes here

 

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Thanks

Hi,thanks for the tip,i,ll give it a try