OzVMX Forum

Clubroom => Twinshock Trials => Topic started by: Oldbiker on June 27, 2012, 03:08:17 pm

Title: Help with a TY250a
Post by: Oldbiker on June 27, 2012, 03:08:17 pm

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.

Title: Re: Help with a TY250a
Post by: cyclegod on June 27, 2012, 03:25:48 pm

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

Title: Re: Help with a TY250a
Post by: Freakshow on June 27, 2012, 03:51:42 pm

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

Title: Re: Help with a TY250a
Post by: tony27 on June 27, 2012, 07:52:23 pm

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

Title: Re: Help with a TY250a
Post by: Oldbiker on June 28, 2012, 05:36:19 pm

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

Title: Re: Help with a TY250a
Post by: Iain Cameron on June 28, 2012, 06:56:32 pm

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

Title: Re: Help with a TY250a
Post by: firko on June 28, 2012, 10:26:00 pm

Quote

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.

Title: Re: Help with a TY250a
Post by: tony27 on June 29, 2012, 06:29:13 pm

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

Title: Re: Help with a TY250a
Post by: Iain Cameron on June 29, 2012, 06:50:21 pm

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

Title: Re: Help with a TY250a
Post by: Oldbiker on June 29, 2012, 06:51:44 pm

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!

Title: Re: Help with a TY250a
Post by: tony27 on June 29, 2012, 07:14:13 pm

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

Title: Re: Help with a TY250a
Post by: Oldbiker on June 29, 2012, 07:22:06 pm

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.

Title: Re: Help with a TY250a
Post by: tony27 on July 10, 2012, 03:54:17 pm

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

Title: Re: Help with a TY250a
Post by: Iain Cameron on July 10, 2012, 05:51:51 pm

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

Title: Re: Help with a TY250a
Post by: Oldbiker on July 12, 2012, 11:18:27 am

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.

Title: Re: Help with a TY250a
Post by: firko on July 12, 2012, 11:53:47 am

TY stuff is pretty easy to find on eBay. I recently bought the exact kit you're looking for for a friends project (that I'll end up fixing ::) ) from the below seller on eBay. Too easy.

http://www.ebay.com/itm/Yamaha-DT250B-0-75-Over-Piston-Kit-DT2-DT250A-TY250-RT2-438-11637-01-/330695800394?hash=item4cff01764a&item=330695800394&pt=Motorcycles_Parts_Accessories&vxp=mtr (http://www.ebay.com/itm/Yamaha-DT250B-0-75-Over-Piston-Kit-DT2-DT250A-TY250-RT2-438-11637-01-/330695800394?hash=item4cff01764a&item=330695800394&pt=Motorcycles_Parts_Accessories&vxp=mtr)

OR

http://www.ebay.com/itm/NOS-1974-Yamaha-DT250-75-Piston-Kit-445-11630-30-/160413677740?hash=item25596678ac&item=160413677740&pt=Motorcycles_Parts_Accessories&vxp=mtr (http://www.ebay.com/itm/NOS-1974-Yamaha-DT250-75-Piston-Kit-445-11630-30-/160413677740?hash=item25596678ac&item=160413677740&pt=Motorcycles_Parts_Accessories&vxp=mtr)