Tuning the 143cc Honda Trail 125 - Big Bore Part 2
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- Опубліковано 22 лип 2024
- How much faster is a 143cc big bore kit on a Trail 125? We use a wide-band AFR to find the right size injector and compare results to before.
0:00 Recap
0:49 Fuel Injector Sizes
1:34 Test Parameters
2:29 Air Fuel Ratio Test
5:05 Octane
7:15 Best Injector?
8:09 EFIE?
10:07 Removing the AFR
11:55 Shifter Mod
12:16 Big Bore Worth It?
#trail125 #ct125 #hondamotorcycles - Авто та транспорт
Oh my god this is the best video I’ve ever seen on ct trail mods. You’re the Project Farm of the Honda trail world. Great job, looking forward to your future videos.
We're going to test that!
Hi i'm so happy with your video.. did you try to make a bigger valve. To make more air more power i think@@ozarkgarage
@@ozarkgarage Need bigger exhaust.
Personally having worked on and run the Z155 Zongshen motor, which is a similar design of engine, I would start with porting the cylinder head as it is free BHP (OK a top end gasket set) and match the ports to the gaskets and smooth out the ports. Next up I would either get a slotted cam sprocket, which is cheap enough or just slot the stock one and back the cam timing of to move the power a bit higher in the rev range. These things don't rev that high anyway with peak power at about 9000rpm and slotting the cam sprocket lifts peak power to about 9250rpm but helps let the engine hold onto the power for longer. My Z155 on the dyno is 14.6bhp and in stock trim was 13.2bhp. But it is not the peak power gain which is important as 1.4bhp is not a massive gain, but where it shows the most is at 11,000 rpm where the stock engine was 10.5 bhp and after tuning it was 14 bhp so it is a 3.5bhp gain over stock. If you need more power still then I would go for the 143cc big bore kit. BUT regardless I would still suggest running an oil cooler as these engines don't have the best design for keeping them cool and the bottom end is still close to the original 50cc motor and these get hot and heat will kill power. The oil cooler just adds a bit of security that it will not overheat or increase heat related wear when using it on trails.
the biggest restriction is the exhaust.. just look how small is the pipe. with a bigger exhaust, not necessary louder,you will se huge great improvment
😊
I wish you were my neighbor so I could hang out with you and learn what you know 😂
Love the data and discussion with the chart/board.
Thanks! No room in the budget for on-screen graphics, unfortunately.
@@ozarkgarage I actually like it, reminds me of Engineering Explained who does or did a lot of whiteboard
This right here is making me want this for a great first fun motorcycle. I’m a father of 4 so I don’t need a death machine to have fun while puttering around town haha. I’m glad I found your video should I get a Honda trail 125 in the next year but would want a little more speed but nothing crazy at all. Thanks for your time and effort to finding a great upgrade option!
You are amazing at explaining why and how you work through the modification process….👍
Thanks!
Great video hand part one). I do not have one of these bikes, but still really enjoyed the videos.
Thanks! 👍
Great break down and I think you pick the right size bore for that bike bullet proof...
Nice, glad to see a follow up video.
Glald you liked it. I thought it would be a quick follow up but it turned into more of an ordeal than anticipated.
@@ozarkgarage makes me want that sensor on every toy I own so I can dial it in
Very well done!
Thank you very much!
Cool project
I watched Part 1 and just finished watching Part 2 of the video series explaining this experiment to get more power for your Honda Trail.
I found it interesting and educational.
As a relatively affordable upgrade for the Honda Trail 125 (now 143cc), it's an appealing solution.
That said, it seems the overall limits of the Honda Trail continue to manifest.
As a "do it all" bike, the demands of highway riding or heavy loads of cargo (or rider) continue to push the envelope of what the bike's engine can accomplish.
Or, put another way, the engine's power output remains the "limiting factor".
Thanks for sharing your upgrade adventure. 🙂
I cover more of the limitations in this video: ua-cam.com/video/SkEUSZYzPk8/v-deo.html
Every postman in Australia 🇦🇺 wants this mod!
Thanks Mate! Love to see a guy who knows what he’s talking about.
Cool
Really interesting, but it did sound at the end that the best results come from rider weight loss. Just a thought😊
Too true! Also a cautionary tale about loading up a bike with a bunch of bolt-on accessories... they all add weight and likely aerodynamic drag...
This is what Australia Post use to deliver mail there little work horses and great for that purpose
Not for long, they have been deemed unsafe for the Aussie postmen. Getting replaced with an electric 3-wheeler.
Thank you very much for making this video and the 143cc BBK instal video. They are super well done and exactly the info I was after to mod my 2020 Super Cub C125. One question I have is do you think the cam is also worth it? Thanks Again!
I did forget to mention the cam was included in the $313. If I were to do it again, I would strongly consider sticking with the factory cam. The factory cam has a compression release so it was much easier to start, you can definitely tell the difference in cranking speed. The kick starter is almost worthless now. One of these days I might throw the factory cam back in and redo the test just to see if there is any real difference.
@@ozarkgarage Thanks, really appreciate your help!
Would be cool to see it on full e85 with a bigger injector to see if you see or feel any improvements. While it does still make more power without increasing the timing, you wont be able to use its full potential but will be much safer at 105 octane.
For a pure race car or something with a flex fuel sensor and programmable ECU, E85 is great. I had a vehicle set up for E85 once and it was a pain (carburetor) because E85 isn't sold at every station.
how many miles do you have on this big bore engine now.
My first time seeing your channel and that was a wonderful video. I have a 2024 Honda XRM 125 in the Philippines and that extra power sounds wonderful. How did it affect your fuel economy? I am getting 65 km/litre here which is 153 mpg. And I ride her as fast/hard as I can most of the time.
I honestly don't think it has changed that much. We put ~90 miles on it between fills and it takes around a gallon +/- so its still good enough for us.
I wonder on how much the cylinder temp change after the BBK was install , I'm thinking of getting one for my grom and i personally dont like the look of the after market oil cooler .
I have considered adding a $25 temp/tach to monitor it.
I wonder what a change in gearing would do for top speed. Add a tooth or two up front.
I don't know the engine has enough torque to go that much faster. It would probably go faster losing a tooth up front. Regardless, the tires are only rated for 60mph...
Do you think a modified exhaust would benefit this big bore set up ?
Probably. It looks like there is more restriction in the exhaust than the intake and I'm sure the cam would be more effective if it could breathe better.
what is the top speed after the big bore kit install?
On flat ground it will hold 60-62, before it was 54-55. Interestingly enough, the tires have max speed of 61 marked on the sidewall!
Nitrous (for the hills😊)
The thought has crossed my mind!
so is it 140cc injector ?
What I would recommend
I would use an oil cooler, so 87 would work. These bikes have so little gas tanks, that you need to be able to get it to run 87 fuel.
Whats wrong with higher octane?
Play with sprockets now to get more top speed
Nope! Not worth it for sure!
59mm bore
cam lift 5.3
valve spring 5 turns
140cc injector
head works- turbulence
I think ,you got a wrong bike for you....