Hi,
Sorry, I haven't logged into the site for a fair while, so this is what I found out for those who are interested !
2014 as per top post ..I searched everywhere! no luck! I eventually got all my parts I needed from partzilla.com
The above mentioned pistons/rings were no longer available, but what works is just to go ahead and fit later model o/s pistons and rings like I did.
After telling all this to my mechanic, he told me the only difference is the ..piston side wall/curtain length.. which is shorter on newer models and doesn't effect anything, (older 85 model have a longer side wall/curtain),that's the only difference!! the shorter side wall/curtain gives a little bit more power with less weight as you would expect
And he said that the shorter piston side wall/curtain on the 1987 FZR750RT and 1988 FZ750UC would go in no worries, so I have done all this 4 years ago now and not a problem since.
I replaced the head gasket and clutch with aftermarket ones too
I put a full list below of what went into my 1985 FZ750N back in 2014 if it helps
Goodluck
Pistons …>>>>>>> 2MG-11636-00-00 PISTON 2 O/S 0.50 (Yamaha Motor)
From >>>>>
www.partzilla.com/product/yamaha/2MG-11636-00-00?q_ref=2MG-11636-00-00---------------------------------------------------------------------------------------------------------------------------
This was my order list back in 2014 from partzilla.com , when I finally pieced it all together !!
AU Prices are a little higher now I would expect……
Order Details Ordered Shipped Ext. Price
1AE-12410-00-00 THERMOSTAT ASSY (Yamaha Motor) $35.67
In Stock Awaiting Shipment
1 0 $35.67
1AE-12439-00-00 O-RING (Yamaha Motor) $10.03
In Stock Awaiting Shipment
1 0 $10.03
1AE-15456-00-00 GASKET,O/PMP CVR 1 (Yamaha Motor) $6.33
In Stock Awaiting Shipment
2 0 $12.66
4FM-15461-00-00 GASKET, CRANKCASE (Yamaha Motor) $10.89
In Stock Awaiting Shipment
1 0 $10.89
4AM-15463-00-00 GASKET,CARB CVR 2 (Yamaha Motor) $7.63
In Stock Awaiting Shipment
1 0 $7.63
1FN-14147-00-00 O-RING (Yamaha Motor) $8.60
In Stock Awaiting Shipment
4 0 $34.40
2KT-11610-20-00 PISTON RING SET (Yamaha Motor) $26.03
In Stock Awaiting Shipment
4 0 $104.12
2KT-11633-01-00 PIN,PISTON (Yamaha Motor) $18.50
In Stock Awaiting Shipment
4 0 $74.00
2MG-11636-00-00 PISTON 2 O/S 0.50 (Yamaha Motor) $56.87
In Stock Awaiting Shipment
4 0 $227.48
33M-12119-00-00 SEAL,VALVE STEM (Yamaha Motor) $4.40
In Stock Awaiting Shipment
20 0 $88.00
36Y-81638-50-00 OIL SEAL (Yamaha Motor) $11.92
In Stock Awaiting Shipment
1 0 $11.92
4FM-15451-00-00 GASKET, CRANKCASE (Yamaha Motor) $6.18
In Stock Awaiting Shipment
1 0 $6.18
90430-06014-00 GASKET (Yamaha Motor) $1.94
In Stock Awaiting Shipment
1 0 $1.94
93210-18417-00 O-RING (Yamaha Motor) $1.77
In Stock Awaiting Shipment
2 0 $3.54
93210-19216-00 O-RING (Yamaha Motor) $1.90
In Stock Awaiting Shipment
2 0 $3.80
93210-23787-00 O RING (Yamaha Motor) $1.99
In Stock Awaiting Shipment
2 0 $3.98
93210-30694-00 O-RING (Yamaha Motor) $2.59
In Stock Awaiting Shipment
2 0 $5.18
93210-33133-00 O-RING (Yamaha Motor) $5.19
In Stock Awaiting Shipment
1 0 $5.19
93210-49046-00 O-RING (Yamaha Motor) $7.38
In Stock Awaiting Shipment
1 0 $7.38
93450-19052-00 CIRCLIP,INNER (Yamaha Motor) $1.01
In Stock Awaiting Shipment
8 0 $8.08
Subtotal: $662.07
Shipping & Handling: $77.99
Tax: $0.00
Order Total: $740.06