I just changed the oil on my Polaris 500 and 350 Grizzly and friends 660 Grizzly.
Found out they all take the same oil filter. So if you want another option these filters will work. The longer 3.5" vs the 2.5" long are a tight fit on the Yamaha but do fit.

These Oil Filters have 20 x 1.5mm threads, 14 psi by-pass valve, anti-drain back valve, 2.3" O.D. gasket 2.5" to 3.5" long.


Motorcycle Filters.
AC Delco PF2135
AMSOil SMF103
Carquest 85358
FRAM PH6017A
Honda 15410-MCJ-000
K&N KN-204, about $13. Metric nut on end for easy removal.
NAPA Gold 1358
Purolator ML16817. Imported, not made by Purolator.
STP SMO 17
WIX 51358
WIX PS1358

Recommended filters. All have superior filtering. (I,m told)
About 2.5 inches long.
Purolator Pure One PL14612, about $6.
Mobil M1-108, about $12. Made by Champion.
Bosch 3300, about $6. Made by Champion.

About 3.25 inches long.
Purolator Pure One PL14610, about $6.
Mobil 1 M1-110, about $10. Made by Champion.
Bosch 3323, about $6. Made By Champion.
WalMart SuperTech ST7317,about $2. Made by Champion.

Buy these filters Automobile Filters,about 2.5 inches long.
AC Delco PF1237
Baldwin B1400
Firestone TF2876
Hastings LF113
NAPA Gold 1365
Purolator L14612
STP S-02876
WalMart SuperTech ST6607
WIX 51365



Automobile Filters, about 3.25 inches long.
AC Delco PF-2057
Auto Pro 2356
Autopride CF240AP
Baldwin B1402
Carquest 85356
Carquest Red B4620
Casite CF240
Castrol 7317
Champion Labs Ph2867
Defense Filters Dl7317
Deutsch D-370
Federated Filters LF240F
Fram PH6607


Automobile Filters, about 3.25 inches long.
Fram Double Guard DG7317
Fram PH7317
Fram Tough Guard TG7317
Fram Xtra Guard XG7317
Group 7 V4610
Group 7 V4620
Hastings LF240
Mighty M4612
Motorcraft Long Life FL-821
Napa FIL1356
Napa Gold 1356
Parts Plus PH2867
Pennzoil PZ-109
Penske 7317
Powerflo SL14610
Powerflo SL14620
Pro Gauge PGO-4620
Pro Tec 164
Promotive PH4610
Pronto PO3593A
Purolator L14610
Service Champ OF-4622
Shell SH48
Shell SH529
Stp S-02867.
Valvoline VO50
Warner PH2867
Wix 51356
Wix PS1358 (specific for ATV's) What ever that means.

 

you've done some serious homework! wow, did not know these facts!thank you

 

I used the longer Fram PH6607 on the 500 Sportsman and 350 Grizzly.
I used the shorter FRAM PH6017A on the 660 Grizzly because it was behind a plastic cover but I think the longer filter would of worked.

I had that filters list for my Polaris along time ago, I was just suprised when I notice the Yamahas had the same size filters.

 

bonus!