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JIMFROMTEXCO
08-21-2006, 07:48 AM
hi yester day i pickjed up a 250x for free! it sat out side since last summer with no spark plug in it. i stripped it down to frame and took the top end off the engine and its shot bad.. the bottem end is fine as it had oil in it.. any ways i was wondering what everyone thought i set a stock 300ex piston at the bottem of the cylinder and its deffinetly to lose for it.. it had a highcompression piston in it.. i then set a 330 piston at the bottem of the cylinder and it was to big.. so my question is can i bore a 250x to accept a 330 kit or should i just buy a used one at standard bore so i know were its at? btw my cylinder is all pitted and and rusty above were the piston sat it was a real pain in the arse to get the head off due to the piston being rusted to the cylinder.

Thanks
bradley300
08-21-2006, 08:08 AM
you can bore the 330 piston to fit, but it will only be a 296 in a 250x.
JIMFROMTEXCO
08-21-2006, 08:48 AM
i dont plan to race it i want a reliable trail quad... would the 296 generate to much heat? i would like to stay with pump gas and keep it cool..
bradley300
08-21-2006, 09:21 AM
it should be ust fine. stay with a piston abput 10.5 or 11.1 and you can run pump gas
bwamos
08-21-2006, 10:48 AM
You have to get a big bore sleeve for an 80mm piston 0.236" overbore (74mm stock bore). It "may" be possible to get it in a stock sleeve.. but the sleeve would be paper thin and very very unreliable.

But, an 11:1 80m piston w/ bigbore sleeve in the 250x is a very nice , and very reliable combo. ;)

It should be ok on the heat side.. but an oil cooler never hurts. ;)
JIMFROMTEXCO
08-21-2006, 01:00 PM
YEA THATS HOW I HAD MY OLD 330 SET UP I THINK IM GONNA GET A 300EX JUG AND RUN A STOCK PISTON OR A WIESCO 11:1.. IVE GOT A CAM STILL FROM MY 330 I THINK IT WAS A TC STAGE ONE OR 2 I CANT REMEBER WHAT ONE I HAD IN IT WHEN I SOLD IT
JIMFROMTEXCO
08-26-2006, 11:04 AM
ok heres another question.... what would a 60 over bore bring it to and would that be to much for the stock cylinder?
bradley300
08-27-2006, 06:55 AM
thats not going to make any big difference, it might end up being a 251, lol reliability wise it should be fine