Help with a TY250a

[Oldbiker]

Please I need help sourcing a piston, rings kit for my TY. A 70.75mm kit is needed and my mates in the industry cant find 1 in OZ. They suggested to go overseas. I have contacts in the UK but they cant do the 3rd O/S only 4th O/S as a kit.

[cyclegod]

http://www.ebay.com.au/itm/YAMAHA-NOS-PISTON-DT2-3-DT-TY250-3rd-72-77-/350393658954?pt=Motorcycles_Parts_Accessories&hash=item519516ee4a

http://www.ebay.com.au/itm/Yamaha-TY250-Piston-Ring-Set-3rd-OS-75mm-74-77-OEM-NOS-NEW-/200698452127?pt=Motorcycles_Parts_Accessories&hash=item2eba8f589f

[Freakshow]

is it a reed vavle  or Pisotn port ?  pp for the DT1 as a kit are $60 delivered ex us, reed ones are cheaper.  i would have some here but gen yamaha if you get stuck

[tony27]

That piston looks to be the same as the complete kit I got for my C model, from memory the cost was about $100us & postage was another 35 or so. I've noticed quite a few things listed lately with $150 postage for small parts.
All TY Yamahas are reed valved Freaky

[Oldbiker]

I already stuffed up with new rings, so I want a full piston, rings etc kit in one package.
thanks for ya help.

[Iain Cameron]

www.yamatopdog.com  Cindy Appleman  is the way to go . speed & sport . Iain

[firko]

www.yamatopdog.com  Cindy Appleman  is the way to go . speed & sport . Iain

I couldn't agree more...I get 90% of my new Yamaha parts from this crew. They're efficient and the prices are fair.

[tony27]

From memory the kit I got started with 311, its dt2 etc so that expands the possibilities

[Iain Cameron]

Any yamaha 250 piston kit up to 1978 will be good they all are the same except the non reed dt1 's   . So DT  , YZ  , MX  , IT   . You have a huge range to choose from including Wisco . Iain

[Oldbiker]

Tony, Ive discovered I had a DT250(438) piston in the bike after all these 28 years! it was needing a hone and new rings, but I mistakenly ordered 434(TY250a) rings...but I didnt know then.
so I'll order a full piston/rings kit so it survives another 30 years!

[tony27]

Guess I'm lucky, mine is still on standard bore but the rings were worn enough that they left a light mark at the back off the bore, probably could get away with a set of rings & honing the bore but chose to bore to 1st oversize
Are the DT250(438) rings normal type rather than the L shaped top ring? The kit I got has the L top ring exactly the same as the original ty one
If you want the number of my kit I won't be able to get it for a week, flying over to Brisbane & the gold coast in the morning & heading home next saturday

[Oldbiker]

let me get back to ya on that..I got rings from the US and they were different to the DT ones fitted. The piston and the 2 ring sets are at a mates place.

[tony27]

Remembered to grab piston kit to get numbers for you

Complete kit is 311-11630-10, pretty sure the last pair of numbers would become 30 for 3rd over
Piston is 311-11635 00(possibly wrong box) has 311 12 01 09 underneath, not sure what 3rd over would be
Rings are 311-11610-10, 3rd over probably finish with 30

Should help you broaden your search

[Iain Cameron]

Ok here is the Yamaha part # std piston ass'y 434-11630-00
                                              1st                   same         -10
                                              2nd                  same         -20
                                              3rd                   same        -30
                                              4th                   same        -40
these are the full kit piston rings clips .   Iain

[Oldbiker]

thanks all, Ive emailed www.tytrials.com (?) in the uK and they can help me with a full piston kit for UK$104 delivered, I may go thru them.
I'll put those part numbers away for future use.