Ty250 Piston Kits

[troutrader1]

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

[paul w]

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, 2008 by paul w

[29r]

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 .

[wrenchbender]

Yes, Tri Z250 3 wheeler

[troutrader1]

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

[pat]

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

[troutrader1]

Hey pat,

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

The new piston was made by"

[pat]

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, 2008 by Pat

[rory]

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.

[alan_nc]

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

[pat]

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.