I watched the whole damn video….and I don’t have any intention of owning a Trail 125 much less modding one. Very soothing voice and detailed easy to understand explanations. 👍👍

@ozarkgarage

5 ай бұрын

Thanks!

When my 50cc 2 stroke died, my dad bored it out to 80cc and a new piston. Before it would cruise at 45mph but after the rebore would cruise at 60. It started a trend for my mates😂

Great illustrations of the upgrades

Looking forward to seeing your approach to tuning this thing

Excellent job Mate!

Great video, as a kid I worked on these single cylinder Honda’s. They sure take a beating, great camera work. 🤓

very nice video and well done ! thanks !!

Awesome video ❤

👏🏼 👏🏼 👏🏼 dude, appreciate the detail. Thanks for sharing!

@ozarkgarage

3 ай бұрын

You bet!

Excellent video, thank you very much!

The ct125 dosent need something to make it go faster, it goes at the correct speed to see life and beauty and humanity unfold in an enjoyable way. The problem is the worlds going to fast and it’s everybody’s job to recognize this and slow it down. The ct125 is a tool to help you recognize this and recalibrate your life. Don’t screw the tool up by making it fit in with the broken world.

Dude this was excellent. I appreciate the info about what can happen when things aren’t as they should be ie piston ring gaps causing seizing. Provides a lot more context for me as a hobby mechanic

@ozarkgarage

Ай бұрын

The Yuminashi kit includes ZERO instructions, so I definitely had to rely on some prior experience with the ring gap.

Great video even if it didn’t end up quite the way you wanted.

great video thanks

Great video. Really helpful and visually detailed. I probably will do this on my 2021 Trail125 by this summer. And thank you for showing the wideband sensor result, because of that, I changed the fuel injector order from 170 down to pcx155 on my Yuminashi's shopping list. I hope it will make my Trail run less richer. What do you think?

@ozarkgarage

4 ай бұрын

I think the 150cc is still too rich with the stock intake and exhaust. I'm still tuning and waiting for some warmer weather to do some extended riding and get the engine hotter, so I'm not ready to share a recommendation just yet.

What a lovely little engine to work on. That's another advantage of choosing a smaller machine, as well as great economy and just the lower weight when you need to push around or manhandle. I had a 90, super little sporty model (SS90, 90SS?) in the 70s and it was the most fun bike I've ever owned. Great video, thanks for posting.

@ozarkgarage

3 күн бұрын

All the engine weight is down low because of the cylinder lying almost flat, the triple clamp and frame neck being low, and the tank under the seat. The bike feels lighter in terms of balance than what the scale says.

@RetroYamaha

2 күн бұрын

How come it says 124 on your bigbore cylinder barrel kit ​@@ozarkgarage

@ozarkgarage

2 күн бұрын

@@RetroYamaha I'm guessing they use the same casting for all cylinders regardless of bore size. Either that or to keep the mod low key for places where it may not be legal...

i just subscribed to you now i need to go back and watch your videos so i know what you did wrong and did to fix it. so i can do it right the first time. I HOPE. lol thanks i wish i had found your channel a couple months ago.

The installation appeared straightforward until it came to filing the rings, which I wouldn't be capable of handling. I assumed it would be a simple install-and-ride process. Moreover, riding at high speeds, such as 60 mph, on a small bike seems perilous without larger tires. I appreciate the power for hill climbing, similar to the CT110 that featured a sub-transmission, allowing it to traverse any terrain.

I look forward to the CBR300 swap 😅

Very rare to find an interesting video these days. Don't know how people can be so boring and think they are the greatest. Don't know why I'm watching this video, as this is something I did more than once, a sign i enjoyed the video. You're absolutely right about going higher on cc brings more issues. I installed a 181, and guess what? Installed the original 125cc back and never again had another issue with it. Kept the piggyback ecu for the high RPM camshaft though. By the looks of it, you're also having problems with yours. I took mine to the dyno, 13hp. And I still brought it back to original cc due to the constant issues. The worst of all was stock bikes not only keeping up with mine, but also overtaking me. That was not funny.

@ozarkgarage

6 ай бұрын

What kind of issues did you have with the 181?

@zefautino

6 ай бұрын

@@ozarkgarage lack of power at high RPM. Difficulty starting some time after installing it. Don't forget the little detail it will chew 420 chains.

I have a green mean stock machine 2023. In 1966 had a Honda Super 90. It was beaten up by the delta phy fraternity at Edison High school Fairfax county VA. I rebuilt it fought of the hate. If I had your video in the day... Really was a well presented video.😊

Hello how is the engine breaking with the new piston?

I find this interesting, i would have changed the gear ratio before the engine for going on the road, it also defeats why they call it a trail 125 bike. If anything i would have shorten the bikes gear ratio for acceration and torque by the rear aftermarket sproket to just to closly match the 1977 honda ct 125 trail bike with a 53 teath rear sproket for trails, back roads, and neighborhood riding to grocery stores. But i also know everyone has there own purpose for it. I know this because find parts parts for the '77 is like fishing for needles in hay stacks. I had to learn every inch of my grandfathers bike to fix it. its got a top speed of 30 mph, it was imported by japan only in '77 to america. And it was mostly bought by the goverment / forest service and advertised to the public for a farm bike.

@ozarkgarage

4 ай бұрын

I did some research on swapping sprockets and with the ABS, it seems a mismatch between the front wheel sensed speed (ABS tone ring) and the rear wheel sensed speed (via engine RPM) causes an ABS error and the light to kick on and disable the system. This bike is for a new rider, so I wanted to keep ABS intact.

What about a more free flowing exhaust? Would the stock exhaust not be to restrictive? I love these video's. Thanks.

@ozarkgarage

13 сағат бұрын

Free flowing exhaust is an option, but I'm trying hard to keep this from becoming a loud bike.

Interesting and a lot of fun but not for the average rider. Solution? buy an XT225 or a CRF300.

You can also use the o2 sensor like a probe and put it in the end of the tailpipe?

@ozarkgarage

9 күн бұрын

Innovate Motorsports makes a tailpipe adapter to use the O2 sensor like a probe, but the CT125 tailpipe is way too small for it.

Could you measure the OE ring gap and use that as a base line?

@ozarkgarage

9 күн бұрын

Gap increases with the bore size so using the OE ring gap would be too small for a larger piston.

@Artoconnell

8 күн бұрын

@@ozarkgarage Hence baseline.

fuel consumption increased ?

@ozarkgarage

6 ай бұрын

More power takes more fuel unless you have some magical gains in efficiency. It will likely be in the neighborhood of 20% increased fuel consumption.

i might be wrong but why did the cylinder say 125cc on the big bore?

@ozarkgarage

13 сағат бұрын

Either they use the same cylinder casting for all of them, or the marking keeps it "stealthy" for places where the mod is illegal.

Unless it fixes some gremlin like oil consumption; I dont get the point of punching a bore over a few thou to gain 5hp.

You'll need a bigger tank too😂

Idk why honda wont sell the Xadv 750 in America. It's a total shame

@ozarkgarage

13 сағат бұрын

Never heard of it before, so I had to look it up. Pretty interesting.

By the time you buy all the parts you might as well have bought a DR400

what year this thing is made?

@ozarkgarage

Күн бұрын

This is a 2022 model

@sixthguardian6914

Күн бұрын

@@ozarkgarage ohh i thought its an old model.

Seems a lot of work and expense for what? 4 or 5 mph?

@ozarkgarage

6 ай бұрын

I'm less concerned with top speed as much as speed loss going up hills. On 2-lane back roads, dropping to 45-46 mph on a hill is not only inconvenient, but also unsafe. If we can get a 15% increase going up hills (displacement was increased by 14.4%), that will be 52-53, which is a lot more reasonable on a 55mph back road. In the next vid I will show some before/after footage and see if we achieve the desired results!

I don't know what was the expected power (probably about 14% more, just like the displacement) but do you know this would only increase the top speed of 4.5% ? This is definitively useless, in my opinion.

@josephperazzo9431

2 ай бұрын

TORQUE

You gotta do the exhaust dude you can’t just do a big poor kid and take a bigger breath and without being able to exhale it all

@ozarkgarage

26 күн бұрын

Trying to keep it from being a LOUD bike, but never is a long time...

Why not just buy a more powerful "adventure" bike that can keep up with highway traffic? Same situation as a motorized bicycle guy wanting to go 50mph, just buy a used Trail 90.

All the crap that comes with bikes now in times past screws on the carbi or a kit would have fixed it

what's wrong with your honda is that it only got small intake valve ideal only for good fuel consumption and not for high speed. the multi hole injector is for bigger valves or 125 cc chinese motorcycle. a stock 125 cc chinese motorcycle are 27mm intake valve and 24 mm exhaust. your honda is tiny 22 mm intake valve.

I don't understand why people buy these then scream how can't go on highway and proceed do all kinds stupid expensive mods . Yeah these where never designed go at highway . Get the right tool for the job. The new honda xr150 is cheaper than a trail 125. used bikes from honda xr125 t0 250, nx 125, nx250 , kawasaki klr250, yahma xt225 xt250 tw200 are all cheaper than a new trail 125. Get the right tool for the job, then save yourself money and not have to do mods.

@Stinkyfish723

15 күн бұрын

Try putting 20kg+ worth of luggage on the rear rack of any of those bikes Champ. Pretty much all of those bikes are also manual.

I did this same thing to my ex wife and she was NOT happy about it.

Hi, came over this video because I own a couple of Skyteam / Honda Dax 50cc and both are upgraded, one to 140cc and the other to a racing z155cc. That exhaust pipe inner diameter is 16mm on the Honda Trail 125cc - That is too tight, I have 28mm on anything greater or equal => 125cc or the airflow will suffer and the HEAT increase... Maybe a little tip, maybe increase the outlet pipe diameter!? Cool bike, but my Daxes rules... Cheers :)

@ozarkgarage

4 ай бұрын

I've thought about increasing airflow via exhaust, but I'm trying really hard not to turn this into a loud bike. I already have enough of those!

@supertrn76

4 ай бұрын

@@ozarkgarage I see. I did it for the heat, so the engine / outlet isn't gonne reach too high temp. I chopped the exhausts muffler part and welded on the 28mm pipe - almost same noise, more airflow and less heat! But like I said, an upgrade from moped 50cc to 140 and 155z engine = needs more air.