Yam piston

[betty2015]

Hi lads were would i buy a first over size 64mm yam piston
Thanks

[Warkton Tornado No.1]

Good quality, affordable components that your Tuner probably prefers you don't know about:

Grampian Motors: http://www.mitaka.co.uk/index.html

However, you might check the 'steps' of over-sizes as the OEM Yamaha pistons used to be in increments of 0.25 mm whereas pattern pistons might only go in 0.5 mm variations. There are NOS items on eBay.

This one looks OEM @ Ø64.25 mm:

272510496938

I hope that information helps

[betty2015]

Thank you

[bazza3004]

Ive used 'yambits' a few times for pistons and always found them good to deal with.

[Fast n Furious]

If its the Banshee piston, you may have problems with the 2nd ring peg position. With some cylinders it will drop over the inlet port.