Yamaha piston assembly part numbers

General forum on engines, transmissions, gearing and modifications to each

Moderator: rztom

Message
Author
Bengt Weil
Posts: 224
Joined: Sat Aug 04, 2012 2:01 am
Location: Ventura, California

Yamaha piston assembly part numbers

#1 Post by Bengt Weil » Sun Feb 03, 2013 4:21 pm

Can anyone verify for .25 OS Yamaha pistons, the following part numbers are what I need to order?

47X-11635-00-00 piston only (upper) -
* order rings (47X-11610-10-00), pin (4Y2-11633-00-00), clips (93450-17129-00) & bearing (93310-316C9-00) separately.

99999-02109-00 piston & rings (lower) - (superseded from 47X-11645-00-00 lower piston only)
* order pin (4Y2-11633-00-00), clips (93450-17129-00) & bearing (93310-316C9-00) separately.

Do the rings come with the new lower piston part number 99999-02109-00 or do they have to be order separately as done for the upper pistons?

Thanks for the help.

User avatar
jackson.40
*****
*****
Posts: 2328
Joined: Fri Dec 30, 2005 7:01 pm
Location: Cambridge,UK

Re: Yamaha piston assembly part numbers

#2 Post by jackson.40 » Sun Feb 03, 2013 4:37 pm

Hello,

If you order 99999-02109-00 it will come with the rings.

Steve

User avatar
Speed Freak
- - - - -
- - - - -
Posts: 930
Joined: Sun Oct 28, 2012 6:38 pm
Location: Voitsberg, Austria

Re: Yamaha piston assembly part numbers

#3 Post by Speed Freak » Sun Feb 03, 2013 5:38 pm

I have ordered this pistons last week.
They came with a set of rings and were cheaper than the 47X piston without rings!

I have compared it with the original 47X pistons.
The piston pin bore has got 2 holes, i think for lubrication.
There are 4 little holes in the piston skirt at the exhaust side, i think also for lubrication and the top land is a little bit lower.
My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda CBR 1000 RR SC57
Yamaha R1 RN04

User avatar
solo 2
Posts: 390
Joined: Wed Feb 01, 2012 1:49 am
Location: Edmonton, Canada

Re: Yamaha piston assembly part numbers

#4 Post by solo 2 » Sun Feb 03, 2013 6:04 pm

Get prices on all your parts and then check this guy out.

http://www.ebay.com/itm/YAMAHA-RZ500-TO ... 69&vxp=mtr" onclick="window.open(this.href);return false;

User avatar
jackson.40
*****
*****
Posts: 2328
Joined: Fri Dec 30, 2005 7:01 pm
Location: Cambridge,UK

Re: Yamaha piston assembly part numbers

#5 Post by jackson.40 » Sun Feb 03, 2013 6:50 pm

Speed Freak wrote
There are 4 little holes in the piston skirt at the exhaust side, i think also for lubrication and the top land is a little bit lower.

Read about it here,they are tdr/tzr pistons.

http://www.pure-2-stroke-spirit.info/do ... lem_en.pdf" onclick="window.open(this.href);return false;

User avatar
Speed Freak
- - - - -
- - - - -
Posts: 930
Joined: Sun Oct 28, 2012 6:38 pm
Location: Voitsberg, Austria

Re: Yamaha piston assembly part numbers

#6 Post by Speed Freak » Sun Feb 03, 2013 7:18 pm

Thanks for this information!

Now there is a question.
Are the original 47X pistons better than the tdr/tzr pistons or are the pistons i have got from the dealer better than the original RD pistons?
As far as i know there were no problems with the front cylinders of the rd500, just with the rear cylinders (because of the carburetors).
My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda CBR 1000 RR SC57
Yamaha R1 RN04

RZColinPaul
- - - - -
- - - - -
Posts: 117
Joined: Tue Jan 04, 2011 2:14 am
Location: Canada

Re: Yamaha piston assembly part numbers

#7 Post by RZColinPaul » Sun Feb 03, 2013 9:23 pm

Mr Jackson.40,
I was just about to put the cast Yamaha RZ500 pistons with TSI spec done to them in to my bike. Willy weighed all four pistons and they are all the same. Would you drill the holes in the pistons as recommended above for more lubrication on break in. I have pushed an old RZ to far during break in and ended up rebuilding the top end. Might this help for my build. :smt017 Thank You lots !!!!!
Colin from Ajax Canada
colinpaul@rogers.com
RZ350 race bike
RZ500 stock
RZ500, TSI spec factory tune stage two,ported polished,JL pipes,28m Mikuni carbs,EB brakes, R6r front end, R6r swing arm, YZR fairing, V Force reeds, Olhin shock, Wasp Performance

Bengt Weil
Posts: 224
Joined: Sat Aug 04, 2012 2:01 am
Location: Ventura, California

Re: Yamaha piston assembly part numbers

#8 Post by Bengt Weil » Mon Feb 04, 2013 2:34 am

Thank you for the replies, subject embellishments and link to ezpezie's ebay ad. I will proceed with ordering the "TDR" pistons, knowing the rings come with them.

User avatar
jackson.40
*****
*****
Posts: 2328
Joined: Fri Dec 30, 2005 7:01 pm
Location: Cambridge,UK

Re: Yamaha piston assembly part numbers

#9 Post by jackson.40 » Mon Feb 04, 2013 7:42 am

RZColinPaul wrote
Mr Jackson.40,
I was just about to put the cast Yamaha RZ500 pistons with TSI spec done to them in to my bike. Willy weighed all four pistons and they are all the same. Would you drill the holes in the pistons as recommended above for more lubrication on break in. I have pushed an old RZ to far during break in and ended up rebuilding the top end. Might this help for my build. Thank You lots !!!!!
Colin from Ajax Canada
I think there are other members here who might be able to give you a better answer.If it was mine i would leave it as it is.

Steve

vma500
- - - - -
- - - - -
Posts: 668
Joined: Thu Jan 26, 2006 3:56 pm
Location: la belgique
Contact:

Re: Yamaha piston assembly part numbers

#10 Post by vma500 » Mon Feb 04, 2013 3:57 pm

Steve is wright about the pistons with the holes on exhaust side = TDR/TZR pistons
they re not so identical as the Rd500 oem ones ,second ring is diffrant (locater pin etc..)
other sizes (icrement of 0.20mm )and tighter clearances needed ,but they can be used for RDs as long the holes are not exposed in the exhaustport .

the rear bank seizures are discussed many times on here , cooling problems ???
the RG500 rear bank cylinders did nt suffer that much despite fully covered by the front bank , so very doubtfull to say only cooilng problems
my bikes :RD500 2X ,RD 350 F2 , RD 350 31K,RD350 4LO,RG500,RG250 WW,RGV250,TZR250 3MA,TZR250 3XV,NS400r,NSr250 mc21,KR1250S,

RZColinPaul
- - - - -
- - - - -
Posts: 117
Joined: Tue Jan 04, 2011 2:14 am
Location: Canada

Re: Yamaha piston assembly part numbers

#11 Post by RZColinPaul » Mon Feb 04, 2013 10:00 pm

Thank You Mr Jackson/vma500, :grin:
I talked to Willy and he said that the extra holes are not needed. He also said that I should quit looking for more power on all these sites my bike will be hard enough to keep on the ground allready. Getting very excited and we are three month's from riding weather up here.
Colin from Canada Ajax
colinpaul@rogers.com
RZ350 race bike
RZ500 stock
RZ500, TSI spec factory tune stage two,ported polished,JL pipes,28m Mikuni carbs,EB brakes, R6r front end, R6r swing arm, YZR fairing, V Force reeds, Olhin shock, Wasp Performance

User avatar
2smoke
Posts: 662
Joined: Wed Apr 20, 2011 3:18 am
Location: Niagara, Ontario,Canada

Re: Yamaha piston assembly part numbers

#12 Post by 2smoke » Tue Feb 05, 2013 2:23 am

jackson.40 wrote:Speed Freak wrote
There are 4 little holes in the piston skirt at the exhaust side, i think also for lubrication and the top land is a little bit lower.

Read about it here,they are tdr/tzr pistons.

http://www.pure-2-stroke-spirit.info/do ... lem_en.pdf" onclick="window.open(this.href);return false;
Steve: That info is about adding holes to the intake side. a different matter.
These guys are talking about holes on the exhaust side of the piston.

I looked closely at my spare RZ500 cylinders and as long as the piston holes line up with the 2 strips of cylinder wall on either side of the exhaust port, i think they will work out fine. (Looks like they do, but i dont have these pistons to measure.)
Usually holes in the exhaust side of a piston are to cool and lubricate the exhaust bridge area on the cylinder. But the 500 doesnt have an exhaust bridge.
The 2 strips of cylinder wall on either side of the exhaust port on the 500 are quite narrow and i can see how they could expand out with heat and scuff the piston.
So again, as long as the holes only line up with the 2 strips of cylinder wall and dont line up with any ports, i think they would work out fine and be a nice upgrade.
Colin

silverstrom
- - - - -
- - - - -
Posts: 3236
Joined: Sat Feb 04, 2012 7:36 am

Re: Yamaha piston assembly part numbers

#13 Post by silverstrom » Tue Feb 05, 2013 2:43 am

jackson.40 wrote:Speed Freak wrote
There are 4 little holes in the piston skirt at the exhaust side, i think also for lubrication and the top land is a little bit lower.

Read about it here,they are tdr/tzr pistons.

http://www.pure-2-stroke-spirit.info/do ... lem_en.pdf" onclick="window.open(this.href);return false;
Thanks for that link Steve. The timing here is perfect. I have an 87 2MA that will need a rebuild in a few months. The Yamaha Measure Report, which I was unaware of, has provided some excellent and valuable information. Seems I'll be wanting TDR pistons for my rebuild. I just happen to have the 1988 TDR250 fiche if anyone needs it.

vma500
- - - - -
- - - - -
Posts: 668
Joined: Thu Jan 26, 2006 3:56 pm
Location: la belgique
Contact:

Re: Yamaha piston assembly part numbers

#14 Post by vma500 » Tue Feb 05, 2013 6:54 am

Steve: That info is about adding holes to the intake side. a different matter.
These guys are talking about holes on the exhaust side of the piston.

I looked closely at my spare RZ500 cylinders and as long as the piston holes line up with the 2 strips of cylinder wall on either side of the exhaust port, i think they will work out fine. (Looks like they do, but i dont have these pistons to measure.)
Usually holes in the exhaust side of a piston are to cool and lubricate the exhaust bridge area on the cylinder. But the 500 doesnt have an exhaust bridge.
The 2 strips of cylinder wall on either side of the exhaust port on the 500 are quite narrow and i can see how they could expand out with heat and scuff the piston.
So again, as long as the holes only line up with the 2 strips of cylinder wall and dont line up with any ports, i think they would work out fine and be a nice upgrade.

exactly , i ve seen them on many bikes already on as well exhaust side as intake side , KR1,rgv, rs ,TZR , as long the holes line up with the cilinderwall or bridged port no need to worry , you can place some yourself there , and they don t need to be drilled all threw the pistonwall ,it helps lubrication penetrating
also pay attention that the ring gaps are not exposed into the boostport or any other port , always keep them lined up on the cilinderwalls , use the clearance that is reccomanded for the piston
i not agree that the YZ ring-locator -pin is better , this type of second ring is more prone to jump over then the original pins from the RD500 ,this type of ring needs tighter clearance
my bikes :RD500 2X ,RD 350 F2 , RD 350 31K,RD350 4LO,RG500,RG250 WW,RGV250,TZR250 3MA,TZR250 3XV,NS400r,NSr250 mc21,KR1250S,

User avatar
Speed Freak
- - - - -
- - - - -
Posts: 930
Joined: Sun Oct 28, 2012 6:38 pm
Location: Voitsberg, Austria

Re: Yamaha piston assembly part numbers

#15 Post by Speed Freak » Wed Feb 06, 2013 1:02 pm

I think i have confused you all :grin:
My pistons are also the TDR/TZR pistons with holes on the intake side.

I had them just 5 minutes out of the box and i thought (i wasn`t looking exactly at them) the holes are at the exhaust side because 2-stroke engines have always more problems with lubrication/heat at the exhaust side.

Now i`m confused.
The TDR/TZR pistons need another clearance than the RZ/RD pistons (0,06-0,065mm)? How much?
And they have not the same diameter like the original RD/RZ 47X pistons?
I have not measured them yet - i`ll make this tonight after work...
When they are really so much different, i`ll try to get 2 original 47X pistons for the front cylinders.
Maybe can get some of them when i`m in japan next month :grin:
My bikes:
RD500 YPVS 1GE
RD350 YPVS 31K 1985
Honda CBR 1000 RR SC57
Yamaha R1 RN04

Post Reply