Hello all,

Does anyone know where I could purchase a Piston Kit for 1985 ty250 .75 O/S?

I am in Australia and seems to be none here...

Thanks

Chris

it may end up costing more in postage but you could try

http://www.jkhirst.co.uk/acatalog/Pistons_Rings_Pins.html

or

http://www.tytrials.co.uk

Edited January 3, 200818 yr by paul w

Seems I fitted one from a Trimoto or was it a Tri-Z? (3wheeler ) Had to cut the back of the skirt to clear the crank halves . A good match otherwise that I recall .

Yes, Tri Z250 3 wheeler

Hey all,

Just finishing off a rebuild on ty250n, anyway may save someone some trouble and money down the track, try using IT250 83-85 model piston rings, half the price and exact size, rings, gudeon and ring locator pins. even the cutaway for intake is nearly identical.

hope this helps

Troutrader,

You achive benefits, some reduced pinking, using a IT piston -83, pref die cast aftermarkets, if you dont chose to go all the way and sending your TYR head to B&J.

Cheers, Pat

Hey pat,

not sure what B&J does to the heads? does anyone know about this???

The new piston was made by"

Troutrader,

In 2-s RR squish and chamber volume are critical factors I know, but my TYR pinking on RON 98, better on RON 102 but far away from perfect.

I might acting incorrect passing links, (moderator, please guide me here).

BJ Racing machining TYR head chamber volume and correct squish band, http://www.bjracing.com/services.html

Basic 2-s head chamber data: http://www.muller.net/mullermachine/docs/squish1.html

//Pat

Edited March 3, 200818 yr by Pat

I have just done a re-bore and am going to use a TRI-Z piston they look the same. The only difference I can notice is slightly larger port holes on the piston might run a little richer. I don't think the back of the piston needs cutting looks the same size.

Just went through the same thing. Used a DT250 piston. You do have to grind the skirts to clear the crank but everything else is fine. I found one on Ebay for a very good price with rings, clips, pin included. I also replaced the small end bearing while I was in there. I was surprised at how much harder it was to kick over after replacing the parts.

Alan

TRI-Z = IT250, 515M

I have just done a re-bore and am going to use a TRI-Z piston they look the same. The only difference I can notice is slightly larger port holes on the piston might run a little richer. I don't think the back of the piston needs cutting looks the same size.