honda 350x pistons ?

[dustrunner]

what is the stock size of a 350x honda piston ? i found 1 and it has a 12:1 piston in it ? is that good or should i stay away from it ? guy said its a little hard to kick over...

[bmanley]

81mm is the stock size and 8.5:1 is the stock compression ratio. I put a 10.25:1 in mine and am very happy with it. Still a little hard to kick but will run on pump gas (91 oct). With a 12:1 you would need to run racing fuel.

[wonderboy]

Stock bore is 81 mm. I've got a 12:1 piston in one of mine, and it really isn't any harder to physically kick it over (as long as your decompression cable is adjusted right). It is a pain, however, to start when it is hot. It just doesn't like to start. You do need to run high octane fuel also. I got away with premium pump gas (93), but mine is a bit tired, and probably not up to full compression. It also will run hotter, so if it is a hot summer day, and you are riding hard, you might not want to sit there with the machine idling for a long time.

For what it's worth, I think 10.25:1 is a great way to go. More compression and power from stock, without the potential problems of the 12:1.