Nope, doesn't need it. Honda has been building this similar design for oh what 60 years now? They run forever with pretty minimal maint. About every 2500-3000 miles check the valves, change the plug and the oil. I have owned a BUNCH of small Hondas over the years with no oil filters (50s, 70s, 80s, 100s, and my current 150). Never ever ever had a single problem with any of them.Strange that the manual doesn't mention an oil filter where it talks about changing oil. Elsewhere, K&N says the 303 filter fits it which would make the filter very common and the same one used for Ninja 300 and Ninja 650 among many other bikes and obtainable in many different brands. However, I cannot find an oil filter on any of the Grom diagrams. I did have a 50cc scooter once that had no oil filter, but surely they put one on the Grom, right?
I notice there is a valve inspection/adjustment at 600 miles (early), 2500, then every 2500 mi. after that. I guess it won't be so difficult to check valves though. My Honda Dealer will offer a Service Contract, but they haven't priced it yet. For my Gixxer 1000 it was $1550 and included all SCHEDULED maintenance plus 3 free anytime oil changes, plus some discounts on tires, parts, batteries. The contract lasts 3 years. I have put 9500 mi. on that bike in 6 months. The valves are a huge deal on the Gixxer just to get to them and that apt due at 14000 mi. would normally cost over $800 if paid for separately. I will just have to see what the dealer plans to charge for the contract for a Grom before I decide. I kind of like to fiddle with bikes, but if the price is right, I'll let the mechanics handle it. Anyone else looking into a maintenance contract? Note these are different than extended warranties and are handled by the dealer, not Honda. I figure Japanese bikes will hold up for years without needing an extended warranty. Never had a problem yet with one that would have benefited by an extended warranty anyway. I don't see screw holes for spools in the swingarm so I guess you'll just use a swingarm rear stand. Doesn't look like my center stand is going to fit it since the exhaust runs along the bottom so that's something else to deal with if I want to change a rear tire, adjust chains, etc. The bike is so small. I wonder if my front stand will even fit the triple tree without bumping into headlights, etc. I really need to see one of these bikes in person.