Ordered a new crank seal set online (winderosa 822140) for my 1987 trailboss 250es but one is completely rubber and the other has a metal backing. The two seals I removed both had the metal backing. Which side get the rubber only and what side gets the metal backed seal? Also why the difference from the original two metal backed seals?

 

Both seals had metal backings on the early engines,but years ago both oem seals were changed to solid rubber. The metal backed seal that still comes with some aftermarket kits goes to the stator side of the crank case.

 

I actually ordered 2 sets of seals should I open both sets and just use the two all rubber ones. If the rubber type seals better or something I don't mind using two sets. Not sure if both sided are same size

 

On the aftermarket kits I'd still use the metal backed seal that came with the kit for the stator side because there may be a slight amount of difference on them,can't say for certain on this aftermarket set.No sense in wasting a second set of seals. Especially since this 27 year old machine still had the original metal ones.To be honest with you,seals changed several times on part numbers over the years,but I just kept in stock a bunch of OEM 3082162 updated seals that fit a bunch of different machines.
Usage : 3082162

Year Product Model Assembly
1999 ATV XPRESS 300 CRANKCASE and CYLINDER - A99CA28CA
1999 ATV XPLORER 300 CRANKCASE and CYLINDER - A99CC28CA
1998 ATV XPLORER 300 CRANKCASE and CYLINDER XPLORER 300 W98CC28C
1998 ATV XPRESS 300 CRANKCASE and CYLINDER XPRESS 300 W98CA28C
1997 ATV XPRESS 300 CRANKCASE and CYLINDER (300) XPRESS 300 W97CA28C
1997 ATV XPRESS 400 CRANKCASE and CYLINDER (300) XPRESS 300 W97CA28C
1997 ATV XPLORER 300 CRANKCASE and CYLINDER XPLORER 300 W97CC28C
1992 ATV TRAIL BOSS 2X4 CRANKCASE and CYLINDER 250 2X4 / W927527
1992 ATV TRAIL BOSS 4X4 CRANKCASE and CYLINDER 250 4x4 / W928127
1992 ATV BIG BOSS 4X6 CRANKCASE and CYLINDER ASSEMBLY 250 4x6/W928627
1992 ATV Euro Big Boss 6x6 CRANKCASE and CYLINDER ASSEMBLY 250 6x6 / W928727
1992 ATV BIG BOSS 6X6 CRANKCASE and CYLINDER ASSEMBLY 250 6x6 / W928727
1992 ATV TRAIL BLAZER CRANKCASE and CYLINDER ASSEMBLY Trail Blazer / W927221
1992 ATV TRAIL BOSS 250 CRANKCASE and CYLINDER Trail Boss / W928527
1991 ATV TRAIL BOSS 4X4 CRANKCASE and CYLINDER 250 4X4 - Update
1991 ATV TRAIL BOSS 250 CRANKCASE and CYLINDER Trail Boss - Update
1991 ATV TRAIL BLAZER CRANKCASE and CYLINDER ASSEMBLY TRAIL BLAZER
1991 SNO STARLITE CRANKCASE AND CYLINDER Star Lite
1991 SNO LITE CRANKCASE AND CYLINDER Star Lite
1991 SNO SWE STARLITE CRANKCASE AND CYLINDER Star Lite
1991 SNO SWE LITE CRANKCASE AND CYLINDER Star Lite
1987 ATV TRAIL BOSS Crankcase and Cylinder Assembly
1987 ATV CYCLONE Crankcase and Cylinder Assembly
1987 ATV TRAIL BOSS 4X4 Crankcase and Cylinder Assembly
1987 ATV TRAIL BOSS 4X4 Crankcase and Cylinder Assembly
1987 ATV TRAIL BOSS 4X4 Crankcase and Cylinder Assembly
1986 ATV SCRAMBLER Crankcase and Cylinder Assembly
1986 ATV TRAIL BOSS Crankcase and Cylinder Assembly
1986 ATV TRAIL BOSS Crankcase and Cylinder Assembly
1985 ATV SCRAMBLER Crankcase and Cylinder Assembly
1985 ATV TRAIL BOSS Crankcase and Cylinder Assembly

 

I'm heading out to start putting it together.
Thanks for your help