Honda Trail 125 Forum
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Oil filter
- Thread starter RayWebb1
- Start date
A supplementary question now: The later engine with the oil filter now has the dipstick on the filler cap at the back because the oil filter sits where the little mini dipstick sits on the earlier engines. Again, no manual yet, so I am wondering if the oil level is checked with it screwed in or resting on the threads? It says unscrewed, resting on the threads, for the short dipstick in the 2022 manual, but is it the same for the long dipstick at the back now? The level in mine (which has only done 50 miles) appears low if it is read unscrewed, but OK if screwed in. One thought I have is that the "wiggle" on the long dipstick unscrewed is huge and therefore the oil level showing could vary a lot if it is not screwed in?
m in sc
Well-known member
thats the way the groms were, its on the threads, not in. far as i know, honda hasnt used 'thread in level' since the 1st gen of v4s in the 80s.
Oil level check procedure is the same as prior years: check on flat ground, bike on center stand, front tire touching the ground, with a warm engine, when you reinsert the dipstick after wiping it you do not thread it in, just set it in and then pull it out to check the level.
Engine oil change is 0.80L on the new motor, 0.85L when replacing the filter (filter change isn't at every oil change, unless you want it to be). When you pull the filter cover there is a metal spring between the filter and filter cover, then you pull the filter itself to replace it. The filter has a rubber seal attached to it so you can't goof it up and double o-ring gasket it. The filter also has a directional label on each side, like "THIS SIDE TOWARDS ENGINE", to eliminate confusion there. Reinstalling it with the spring is simple as there's a recess in the filter to fit the spring. It's a replaceable paper element filter.
You can follow the maintenance schedule from the 2023 Super Cub's owner's manual while waiting for the 2023 Honda Trail owner's manual, though it seems odd you were able delivered a bike without one.
Page 39 has the maintenance schedule:
The oil filter is P/N: 15412-MGS-D21
It fits many other Honda models and should be easy to obtain.
Engine oil change is 0.80L on the new motor, 0.85L when replacing the filter (filter change isn't at every oil change, unless you want it to be). When you pull the filter cover there is a metal spring between the filter and filter cover, then you pull the filter itself to replace it. The filter has a rubber seal attached to it so you can't goof it up and double o-ring gasket it. The filter also has a directional label on each side, like "THIS SIDE TOWARDS ENGINE", to eliminate confusion there. Reinstalling it with the spring is simple as there's a recess in the filter to fit the spring. It's a replaceable paper element filter.
You can follow the maintenance schedule from the 2023 Super Cub's owner's manual while waiting for the 2023 Honda Trail owner's manual, though it seems odd you were able delivered a bike without one.
Page 39 has the maintenance schedule:
The oil filter is P/N: 15412-MGS-D21
It fits many other Honda models and should be easy to obtain.
Last edited:
m in sc
Well-known member
incidentally this overdue change in the motor (filter capability) came from the aftermarket covers that were being sold by takagawa for the groms and monkeys for the past..9 yrs? . It even uses the same filter. lol.
Did you ever find out why the dip stick is reading low? I just did an oil change using the manual spec 0.8L and it reads below the low line on the stick. I'm not screwing in the dipstick when taking the reading, as per the manuals instructions.
I also called the dealership and they don't have an answer for me.
I ended up putting a bit more oil in, up to 0.9L. I can't imagine that will be an issue.
Thanks, Ryan
brbo
Member
FYI - New Eng. - couple weeks ago - checked oil after PDI - wasn't even on dip stick (stand/flat/not screwed in).... advised dealer no real answer, then added maybe 150ml app to get it near top line.... after 100km did oil change no filter - 800ml was at bottom line added another ~100ml to get to top line....
I have also since done an oil change. 800ml came out of the sump. Changed the filter at the same time. It took 900-950ml to get the level at the upper mark on the dipstick. I feel happier with those extra ml's in there. The dipstick is a little hit and miss. it you hold it on the threads as though you were about to screw it in it sits at a diagonal angle. If you hold it vertically it does not sit on the threads. I opted for the former diagonal method and filled it to the upper mark, after running the engine to fill the new oil filter. There is a bit more in there than it came with. Nice Castrol semi-synthetic 0-30w.
Why not run an oil that is made for wet clutch use. It's what 3 or $4 more for Castrol T4 10W-40? They certainly don't give these little bikes away, seems a little short sighted to save a couple bucks on oil
Good deal, you said 0w-30, Castrol doesn't make motorcycle oil in 0w-30
BaldRider
Well-known member
I like to keep regular maintenance consumables on hand and was shopping for oil filters and o-rings. I cross-referenced the 2023 Grom, C125 and CT125. They all use the same filter (15412-MGS-D21) but the Grom uses a different o-ring part number (91302-PA9-003) than the CT and C125 (91302-K0G-911). They are both 39.8x2.2 but the one for the Grom costs about 5x more.
Edit: I just realized that the 125 oil filter is the same one as the secondary oil filter on my Goldwing (it has two filters). That's nice from a garage inventory perspective.
TrailSnot
Active member
- Joined
- May 16, 2023
- Messages
- 101
Any chance you know a torque value for the filter cover fasteners? Firmly snugged up sufficient? Or is there an established value that you know of? TIA
BaldRider
Well-known member
The bolts just hold the filter cover in place. The o-ring does all the work. Honda doesn't specify torque for the Goldwing filter cover, either. Just snug enough to hold the cover in place and that cover is on the underside of the bike. Another lesson learned from the Goldwing is to be careful not to pinch the o-ring when reinstalling. It is super easy to do and it will leak. I'll be changing the oil in Booger this weekend or next weekend and I'll confirm. I probably have other o-ring gaskets that will fit, as well.
TrailSnot
Active member
- Joined
- May 16, 2023
- Messages
- 101
After giving Snot the beans I'm changing it sometime over the weekend. I have the oil already and am going to the dealership tomorrow armed with the part numbers you previously posted for filter and o-ring. Will be cautious putting the cover back on.