troutrader1 Posted January 3, 2008 Share Posted January 3, 2008 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 Quote Link to comment Share on other sites More sharing options...
paul w Posted January 3, 2008 Share Posted January 3, 2008 (edited) 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 Quote Link to comment Share on other sites More sharing options...
29r Posted January 4, 2008 Share Posted January 4, 2008 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 . Quote Link to comment Share on other sites More sharing options...
wrenchbender Posted January 10, 2008 Share Posted January 10, 2008 Yes, Tri Z250 3 wheeler Quote Link to comment Share on other sites More sharing options...
troutrader1 Posted February 20, 2008 Author Share Posted February 20, 2008 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 Quote Link to comment Share on other sites More sharing options...
pat Posted February 21, 2008 Share Posted February 21, 2008 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 Quote Link to comment Share on other sites More sharing options...
troutrader1 Posted February 29, 2008 Author Share Posted February 29, 2008 Hey pat, not sure what B&J does to the heads? does anyone know about this??? The new piston was made by" Quote Link to comment Share on other sites More sharing options...
pat Posted March 3, 2008 Share Posted March 3, 2008 (edited) 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 Quote Link to comment Share on other sites More sharing options...
rory Posted January 21, 2009 Share Posted January 21, 2009 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. Quote Link to comment Share on other sites More sharing options...
alan_nc Posted January 23, 2009 Share Posted January 23, 2009 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 Quote Link to comment Share on other sites More sharing options...
pat Posted January 25, 2009 Share Posted January 25, 2009 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. Quote Link to comment Share on other sites More sharing options...
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