Video

That’s pretty awesome 👍

Is there a gasket for the rocker cover or does it just use permatex?

Cool project

Puts gloves on while stripping engine but non when removing sump plug!

I don’t even need a two wheeler but I still watched the whole thing…..you’re good

59mm bore cam lift 5.3 valve spring 5 turns 140cc injector head works- turbulence

Play with sprockets now to get more top speed

Really interesting, but it did sound at the end that the best results come from rider weight loss. Just a thought😊

Another benefit of this jack compared to a hi-lift is that it is significantly safer and easier to control. Using either style of jack can be dangerous, but this is a much better option.

I hate fuel injection. I love the carb

Needs a camshaft upgrade!!!!

I've not heard of anyone using EVANS cooling waterless radiator fluid to replace stock fluid in a motorcycle. But I know Jay Leno swears by it for his vehicles. 375 boiling temp no vapor non-boil over and stops corrosion of water pump. Might be something for this Honda Trail if it is running hotter. $50 on Amazon.

That’s really great idea I have 4 seater tracker planning doing same thing Just wonder where do you relocate the battery?

Trailers are funny. Always could use bigger or wider or lower or or or.....been think about a deck over setup but I really like my 16 ft heavy trailer, its 83.25 wide 2 foot dovetail. Its 5" over 6" channel and 2k lbs even, as said heavy. Ur setup must be a feather, ever weigh it?

Bad ass! Designed, better than anything I’ve seen!

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.

Every postman in Australia 🇦🇺 wants this mod!

The top record of the C70 engine is in the 87mm piston by a workshop in Yogyakarta, Indonesia

Swap it with daytona engine 4valve. .

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 pour beer on mine 😂

The float level dose not dictate mixure

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.

This sounds great BUT being an old geezer with arthritis- does this require a TON of power to utilize the crank? I have a 67 IH Scout to use this deal on- Will it be ok for me? AND I can weld but only have a 110 V Lincoln that I can use.

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 .

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

Similar to a VW Vanagon jack

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

Great break down and I think you pick the right size bore for that bike bullet proof...

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.

what year this thing is made?

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

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

Will be nice if it came welded where it need to n just add bolts will like one but dont have a welder or place to weld it.

So cool I had to watch it twice.

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. 🙂

One thing missing on the hi-lift jack, the ‘winter feet’ to keep it from sliding around when you don’t want.. I used 3/8 by 1 1/4 bolts with nuts on the bottom. The thread locked into the ground, End of slide-out..

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

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

Turbo technics were doing this in the 1980s if you still interested

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.

what is the top speed after the big bore kit install?

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.

I almost broke my jaw with my farm jack when the mechanism released and the jack handle shot up and wacked me in the jaw. I think I need this jack.

Take my money!

Love the budget simplicity. How would you add a spare tire?

Nope! Not worth it for sure!

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

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

Hello how is the engine breaking with the new piston?