300EX and 250X Cylinders

[Darrell]

Hey! are the cylinders from a 300EX and a 250X the same? I need a new one for my 300 and and found one off a 250X. I looked at the OEM Honda part numbers, and they are differant. What would I have to do to make it work? Thanks in advance.

[bradley300]

you would also need a 250x piston or have the cylinder bored to match the 300ex piston. if th cylinder is off anyway might as well put in a new piston, if you dont have the new piston and rings yet, talk to the quadshop about a LRD309 kit, it dosent require a sleeve so its just as easy to instal as a stock pistion and you will love the power increase. just food for thought

[Darrell]

Thanks for the info..:)

[300exazzkikr]

I believe the piston sizes are the same, the stroke is different. Makeing the cylinder for a 300 a little longer, I know the heads are the same. Not positive on this info but 90%. Hope this helps.

I would do a little more research before you buy the cylinder.

[250x#93]

I'm almost positive that he is right, honda did add a bigger stroke to make it 300, The piston sizes should not be different.

[Darrell]

Well it does makes sense it would be differant. Although it seems like some people think everything on a 300EX and a 250X is interchangable.

I know some things are (like the cylinder head) or atleast thats what I'm told.

Thanks for your input. :)

[TRX300X]

The cylinders are 100% interchangable. The bore is the same but the stroke is different.

[HotRod2Fitty]

The piston skirt on the 300 is longer due to its increased stroke.