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Honda Trail 125 Forum

Welcome to the Honda Trail 125 Forum! We are an enthusiast forum for the Trail 125, Hunter Cub, CT125 or whatever it's called in your country. Feel free to join up and help us build an information resources for this motorcycle. Register a free account today to become a member. Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!

Sprockets

m in sc

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Its a 428 stock. its that simple. the model is a CT125. dealer will be hit or miss on accurate info.
 

WillJohn68

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Dec 27, 2021
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Hi, complete newbie here and numpty. What is the standard sprocket setup up on the CT when they come ? Picking mine up tomorrow. What do I need to change to to gain some more speed on the pavement, I don't mean 100mph speed lol. Also another setup for trails for climbing etc ! Any advice is most welcome. Ive read the inputs here but there's so much about this an that im confused. I just want a set of cogs for the road and different set I can swap over to when im camping ready for trails. Cheers
 

m in sc

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the gearing isnt limiting top speed, its the hp. just fyi. just pick up a 13t front sprocket for off road. leave the back alone. my .02
 

WillJohn68

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the gearing isnt limiting top speed, its the hp. just fyi. just pick up a 13t front sprocket for off road. leave the back alone. my .02
As said im newbie and have a few other bikes but I don't mess around with them. That said if I made the front bigger and back smaller surely that would increase my speed ! Maybe slower on the pickup but cruising should be improved no !
 

m in sc

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NOPE. doesn't work that way if you don't have enough horsepower, and the trail doesn't. in stock configuration it comes nowhere near redline in 4th gear wide open at max speed. theres posts about this elsewhere but trust me on this one.
 

WillJohn68

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NOPE. doesn't work that way if you don't have enough horsepower, and the trail doesn't. in stock configuration it comes nowhere near redline in 4th gear wide open at max speed. theres posts about this elsewhere but trust me on this one.
hmmm But you guys are swapping the cogs to make it pull better for trails, So it works one way but not the other lol.
 

dmonkey

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You would need a different tune on the bike to go faster. The Super Cub 125 is capable of (slightly) higher speeds (on flat ground) in part because it's tuned for more HP and less torque than the Trail is, along with the gearing. If you were to tune it for HP you'd lose much of the hill climbing ability which is already a struggle for the bike beyond low speed.
 
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WillJohn68

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You would need a different tune on the bike to go faster. The Super Cub 125 is capable of (slightly) higher speeds (on flat ground) in part because it's tuned for more HP and less torque than the Trail is, along with the gearing (transmission gear ratios and rear sprocket).
Lol this is where my basic nut gets lost. I have the same legs but if I change gear (bigger front smaller rear) on my pedal bike I go faster. So why does this not work on a motorbike ? This is seriously warping my peanut lol
 

dmonkey

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There's a decent explanation here. It's talking about transmission gears, but the same applies to final drive gearing.
 

m in sc

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its basic physics. you need 'x' hp to move an item with 'y' mass (and 'z' wind (and rolling) resistance) to a certain speed.
 

WillJohn68

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There's a decent explanation here. It's talking about transmission gears, but the same applies to final drive gearing.
Yeah ok I get ya now lol. It is that simple lol. SO the only way is to go for the 201cc upgrade hahahah
 

dmonkey

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Daytona 212. Need a carb on top of that at £185 so £1385 in total and your driving.
If you're talking about swapping in a Chinese cate motor expect a lot more parts to replace or install, some that will require fabrication by you or someone else, and lots of labor. You might need engine mount modifications and other clearance mods to fit the engine, you'll need to sort out the air filter, sort out throttle cables, and you'll have a lot of electronics to sort out for TPS, ignition timing, etc. It's probably best to find answers and price everything out before you unexpectedly end up with a bunch of time and money into the bike and it's still not finished while you could have been riding it in the meantime just slower, or a bunch of time and money into the bike and you've got a 2xxcc bike that isn't what you hoped it would be, requires a lot of upkeep, and is as sketchy to ride as an 8hp Briggs & Stratton powering a folding bicycle. Depending on where you are the bike may also no longer be street legal. Just words of caution, if you're up for doing it more power to you and I'd love to see it, just don't expect it to be cheap and easy.

The Takegawa top end kits paired with other BBK upgrades on WeBike look expensive up front but would probably still end up cheaper (and definitely be easier) than swapping the motor and going to a carb, and with much better reliability.
 

m in sc

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yeah good luck with that chinese motor & fitting it.... I've been in the grom game a long time, since they came out actually. I can say this, you get what you pay for. you might get out for 2500-3k if you do all the fab work yourself and hope it holds together. I've been down the road with 4 valve heads, etc. could do 95 on a grom based motor, and was sweet no doubt but was very pricey. Built to the point to the point the rod finally gave out shifting into 4th at 75 mph. then I swapped in a 250cc 2 stroke motor. If you're up for the tack of fabricating it to work, have at it, its a LOT of fun. But its no1200 bolt in mod, neither is an anime or daytona, not by a long shot.
 

WillJohn68

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Dec 27, 2021
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Cheers lads ive been told by Zontal racing that the Daytona's are solid engines and they they would be a straight swap in to the ct125 with only a carb as a extra. Reckons I could do it on a day stop over ! Maybe I will have to quiz a bit more. It was never a definite. I have Ducati for going proper fast. I just wanted to stay safe on the A roads and push a 60 if not 70 rather that 50 and have trucks bring to kill me (cousin on his too) if we off for a few days/weeks adv/camping trips. So if any of you know the easy way to cruise at least at 60 id appreciate the advice. Cheers again dmonkey & mn in sc ;)
 
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