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Rode Lazy Dog's CT with 142cc BBK

orbitzor

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Dec 6, 2022
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Hi all, thought about putting this in the BBK thread that is going on but decided to do it here since this bike also has other mods that added to the performance.

I am sure more then a few members here have seen Lazy Dog Productions vids on all of his R&D on the CT. He has also posted some pretty detailed info in the BBK thread here.

For a little background, the wife and I have 2 new 2022 CT's...each has about 500 kilometers on them now, so not even at the first oil change yet. We relocated from southern central Thailand (mostly flat terrain) to northern Thailand (not so flat terrain) so I knew we might need to make some adjustments to the bikes to give them a little better performance on the hills.

Thinking I would go for the BBK, I got in touch with Eddie (Lazy Dog) to get his guidance. As it turns out, his place is just down the road 15 minutes from my house. Called him up last Sunday when out on a ride and he invited us over to check out this CT aka El Diablo. After about a minute, Eddie took a quick look at our bikes (as in about a 2 second look lol) and said our bikes were not 2022 bikes, they were the 2023 bikes....at least the engines were the new engines in the 2023 models. A bit puzzling since the dealer here in Thailand sold (and titled them) as 2022 models. Not sure if this is specific just to Thailand or not. Of course, this meant no BBK options right now. Bummer, but the fun was just starting.

We headed out for a ride....somehow my wife got the first crack at El Diablo! Eddie jumped on her CT and we headed out. Great ride through the Thai countryside, a quick lunch and then a run up some pretty steep hills to a temple. I could tell she was a little reserved on Eddie's bike...though she kept saying over the helmet comm's she couldn't believe it was the same model as ours. After I got a chance to ride it, I think it was just the load of additional power his bike has that kept her easy on the throttle.

We switched bikes and I took a run up the hills...and I can say the work he has done has transformed the little CT into the beast it should be. Climbing steep hills in 3rd gear with a bunch of throttle to spare was a hell of a surprise. Overall, I probably rode with the throttle cracked maybe a quarter of the way open vs. 75% on my bike in any kind of hills. In all conditions we rode in, his bike had ample pull through all gears. Like real pull that is normal on bigger bikes. In 4th gear cruising along at 65 KM's per hour, rolling on the throttle had noticeable acceleration....not a sensation I am used to in 4th gear on my CT lol. At any point, I could have blown past Eddie and my wife on stock CT's without a problem....and on a hill of any major elevation they would get left far behind. Had I not actually ridden his bike myself, I would be a very tough sell that the CT would capable of that level of performance bump without a ton of custom / specialized / expensive engine work and other mods.

I don't think his mission was try and turn it into a different bike...he loves the CT for what it is but wishes Honda would have done a bit more with the stock bike since all of his mods are pretty straight forward i.e. no splitting the case or swapping out the engine. The BBK, a new muffler, at 42T rear sprocket and some, head ported and remapping, etc. All stuff other members here are discussing or are doing. He has about 10,000 kilo's on his bike so reliability is there. But the results of all of the trial and error he has gone through to find the right "tune" for the CT are pretty impressive. They make a fun bike even more fun for sure. And he has detailed all of it on his channel which is a bonus. I would be surprised if Honda doesn't at least know about Eddie's channel...if they don't they need to. He is the CT whisperer.

For our bikes, with no BBK available yet, we are going to do change out to a 42T rear sprocket, new mufflers and a remap of ECU (at least I think I heard him say something about that) to try and get a decent performance bump for the hills. Will post an update when we get the work done.
 

orbitzor

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Dec 6, 2022
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EDIT: I forgot to add Eddie also suggested trimming additional weight off the bikes...the after market accessories we added (crash bars, passenger seat / pegs, back box, etc) added about 17 KG's to the bikes weight so we are also going to swap out the swing arm for an aluminum one and dump the back deck for something lighter which, with the weight savings with the new muffler, will gain back a material amount of the KG's the other mods added. We are also going to swap out the air filter. He also may have suggested a diet for me, but seeing my love for his ICE cold beer in the hot Thai sun probably took that off the table 😁
 

dmonkey

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There are BBKs for the updated Euro 5 engine, just haven't seen a kit specific to the 2023+ CT125. If you're able to get the ECU remapped, these might be viable options:
 

RustyRodder

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Oct 23, 2022
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149
Really wish there was an easier way than bandaids or Japanese tuners that are half un-understandable. Almost makes me want to trade for a monkey. almost.
 

m in sc

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my Band-Aid has been working pretty well, but i agree, lot to be desired. I really wish i could find the plugs to adapt the new ecm plug to the old school grom/1st gen trail ecm and then its wide open, and for cheap since unlocked ecms of that gen can be had for near nothing.

I wonder how expensive a 1st year thai ct125 wiring harness is? that would do it. hmm....
 

RustyRodder

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Oct 23, 2022
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my Band-Aid has been working pretty well, but i agree, lot to be desired. I really wish i could find the plugs to adapt the new ecm plug to the old school grom/1st gen trail ecm and then its wide open, and for cheap since unlocked ecms of that gen can be had for near nothing.

I wonder how expensive a 1st year thai ct125 wiring harness is? that would do it. hmm....
That would be an interesting possibility. Can you swap an entire harness and ECU from a grom/monkey? or is the TPS different here too?
 

m in sc

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good q... and one i thought about early on. I have a full '14 grom harness actually, from my previous project, and where things are and how its routed is different, for sure. also, there is a map sensor ( i believe) the trail and supercub have that the monkey and grom do not have. then, theres the instrument cluster plug to deal with, which is different.

My thought is after modifying all that, it might be easier jus to get a whole harness or splice-in the grom ecm plug, if it will work.

one thought i have had, and i DID do this on my 87 TZR250 with the cdi and powervalve controller, is to get a large multipin connector set, and splice out the stock ecm plug but with about 3-4" left on the plug. then, do the same on the grom one. put a large multi plug connector (conventional, male for example) on the trail harness, then put the corresponding female on on each stubbed out ecm plug. therefore, it can be swapped out by simply unplugging it, and is 100% reversible.

I have -no- idea how this would affect the gauge, or abs setup. would have to study the wiring pretty closely but i mean, the speed sensor, injector, tps etc are all basically the same between the 2 models. no real reason it wouldn't work. 🤷‍♂️ I just havent tried it.
 

dmonkey

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There's the aRacer RC Mini X, easy but spendy. Quite a few CT125 Kitaco Neo 181cc builds in the USA running it now. Works with the current USA JA55 models, will likely work with the 2023+ JA65 models in the future since it already has support for the latest Grom and Monkey.

@orbitzor , since you are in Thailand with the 2023+ model, if Eddie doesn't already have a connection to remap it you can reach out to Remap Motorcycle Thailand
 

orbitzor

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Dec 6, 2022
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@dmonkey thanks for the link! I will be with Eddie tomorrow for a ride and will ask him. By the way, do you know if the motor in the 2023 Trail is the same as in the new Grom? We were thinking it is only the DAX that shares the same engine. Also, just as an aside, this morning Eddie tried to put a 13T countershaft sprocket for the 2021 CT's on our bikes and they don't fit...they slide part of the way on and then stop. Closer inspection shows very minor changes to the splines on the countershaft thing. He also noted that he plastic cover that has to be taken off to get to the CS sprocket is different. It apparently has a new tab on there that makes it a bugger to get off. The rear sprocket is now stock 38T, not 41T as on the 2021 model. At least I think that was his finding. Also, he took a look at the muffler on the new bikes and they have changed the head pipe quite bit...there is no longer the 3 bends in it. It is just one gradual bend now. When Eddie has time, we are going to pull my stock muffler off and see if the 2021 stock muffler lines up correctly before I order a new one...Murasawki I think it is. Little surprises around every corner with the new model.
 

dmonkey

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For the new Euro 5 engines they're all the same base engine, just with a few minor parts different between them. The latest Super Cub, Dax, and CT125 are most similar since they all share the semi-auto transmission setup. I think Honda made it a point to keep more parts in common between the models than they had on the previous generation of miniMotos, because the latest Super Cub, Dax, and CT125 all share the same crankshaft for example while the prior gen CT125 only had the crankshaft part number in common with the Wave 125i and its various regional names and differences. One of their benefits of iterating to a new generation across the whole line up

The rear sprocket changed from 39T to 38T but I didn't know the the splines changed too, that's a good find. I noted some of the model year differences here, but the new engine is the big one since it results in so many other part changes:

The exhaust is a great mod for dropping weight and adding some character, the stock exhaust on my 2021 was right around 10 lbs. The Outex one I have mounted now is certainly lighter, didn't weigh it but I'd guess around half the weight. Then I added on other heavier stuff and canceled the weight savings out lol

Please keep us posted on how you and your wife like your Honda Trails and whatever mods you end up doing!
 

orbitzor

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Dec 6, 2022
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@dmonkey, thanks for the great into. Just to confirm, it is the splines on the front sprocket that have been adjusted. I did swing buy Honda today and picked up pair of 13T front sprockets and a pair of 42T back sprockets to experiment with. The Honda tech said the front sprocket was the same one for the DAX, while the back sprocket was still the same one used on the Wave. In comparing the 13T Eddie tried to put on and the new one I just picked up, the diameter of of whole to accept the shaft is noticeably larger. We want to try the 13T to just to test if it still causes intermittent problems with the ABS. Eddie opted to go with the 42T and leave the front sprocket alone because of that. Though his crew rides in some of the toughest terrain up here so he is really pushing the limits of the bike which might explain why he seemed to see the ABS problem more frequently. Even if we stay out of the hellish stuff he has fun in, he is still thinking 14T / 42T is the way to go for us because having the ABS get upset and shut off coming down a 13%+ grade hill is not ideal especially for my wife who is on her tippy toes even with a low profile seat. I will report back the results of the sprocket tests with the part numbers in case anyone else is playing around with this.
 

orbitzor

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Dec 6, 2022
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Also, one other data point. We did pick up gear shift indicators to add to the bikes. Eddie did verify the sensor whatchamajig (it is a little round looking thing down by countershaft sprocket) is still the same as what is on his bike so he thinks the shift indicator should work fine. He has what looks like the same shift indicator on his bike and I have to admit, I did like having it to reference so I am glad we grabbed them to throw on the bikes. He put it on for a different reason though. Since the unmodified bike has to take some of the hills here by cycling between first and second gear, the concern was accidentally shifting into neutral going up hill means you are rolling backwards in a hurry. Made sense to me when he explained it. Now that his bike is set up the way it is, it isn't a concern any longer as his bike can handle most of the hills here in third gear and still have power to spare.
 
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I need to chime in here a little bit also. If not for Shawn and his wife Natta, I still would not have gotten my hands on the new 2023 model CT125. I think I understand Hondas thinking behind making this change on the engine as consolidating the clutch bikes together and the auto-clutch bikes together means they can bring engine components in line and make it easier on the factory. Of course we ride one of the bikes that got the engine changed on it, makes it a bit tougher to modify it for power until some of these hop-up guys can figure out what parts from what engines will make these things scream. Until then, we are working old school on their two bikes to get them to where they can take them into the mountains around Chiang Mai and not suffer the same fate as those who have tried it on a stock CT engine. Chris Sable and a friend of his have both taken some nasty falls because of low power on steep sharp curves in the mountains. The addition of the shift indicator helps limit the thinking your in 2nd when you're really in 1st and then downshift into Neutral which has caused multiple wrecks on these mountain passes. If you've ever been on a steep incline and hit neutral, you'll understand how quick the bike stops and then proceeds to go down the hill backwards... We'll play with gears and a better pipe to get some of the giddy-up and go in these two bikes so they don't get hurt on their adventures around Thailand. We'll be sure to post what we find out and exactly what parts will interchange. Once we get the shift indicator installed on one of them, we'll have a chance to look at the ECU (You all call it the ECM in the states) and find out if any of the current bikes ECU will interchange so they can be re-mapped, we'll also let you all know. We should be doing that next week...... Be safe out there and enjoy your CT's....
 

orbitzor

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Dec 6, 2022
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Thanks for the link @m in sc. Eddie is researching whether kits like this can be made to work on the CT. In looking at the pictures, he said the BBK and CT have the same number of cooling fins so that might be a good sign that it could be workable. Couple other things we found out today:

That plastic that you need to remove to get to the countershaft is a pain to get off. You need to loosen the bash plate and shifter / foot peg assembly almost to the point of taking it off in order to get the plastic off. We loosened and I just stood lightly on shifter lever and foot peg to force it down a little bit and even then it takes some forcing to get the cover off. It looks like it is because there is a new tab (plastic) that extends out past the bottom bolt hole in the plastic. That little tab does have a an oblong hole bored out of it but from what we could see it serves no purpose at all, at least on the CT. It doesn't connect to anything or even make contact with any other part of the bike. Maybe that same panel is used on one of the other bikes or something where that little tab is utilized? Next time we have the panel off, we are going to cut that little tab off to see if it makes it easier to get at the countershaft assembly.

The countershaft is actually tapered now.

The 13T countershaft sprocket for the DAX did fit the shaft correctly...but the retainer clip (not sure if that is the correct name for it..it is the diamond shape piece that goes on after the sprocket that you rotate slightly to lock in place before putting the bolts in) that came on my bike does not work. The holes on the DAX sprocket are about 1-2mm (guestimate) off from my original clip so it is off to Honda again to get the retaining clip for the DAX to see if that solves the problem.

Eddie tried to put on the 42T rear sprocket for the Wave I picked up. Confirmed that the bolt positions for the rear sprocket have not changed and the Wave 42T sprocket fit correctly. However, the chain was not quite long enough...he could have probably gotten it on but aborted because it would have left the chain too tight when everything was back together. He took a shot knowing it would be close, but hoping that my chain had stretched just enough to get it on there correctly. We decided to wait until either the current chain stretches a bit more (our bikes only have 500KM on them) or I pick up a longer chain.

It is Songkran aka New Years here in Thailand (think worlds largest squirt gun fight) so everything is closed down until Monday so I have to wait until then to get the parts. On a fun note though, my wife and I got absolutely soaked on the bike ride from Eddies house back to our house....gauntlet after gauntlet of kids with hoses, buckets and squirt guns eager to cool you down as you ride by! Since it was 100+ degrees outside, we just slowed down and let the kids have at it. As a little trivia, the Thai's believe that the water washes away any bad luck going into the new year so they are actually doing a good deed for you by soaking you. A lot of fun to be a part of :)
 

m in sc

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It will work, heck my 2014 grom cyl bolted right on to my 21 trail. honda will typically keep a lot of this stuff similar, and all the development is going to be on the grom side at least for most of the world., that's just the reality of it for the aftermarket where people will pay for it. heck, the big bore kits were available like 2 mos after the groms were released back in 14, i know, i had one of the 1st groms (still have it). Its no surprise the '2nd gen' cyl types big bore kits/heads/ etc are already on the market at this point. the -only- real issue i have found concerning swapping stuff over has been the primary drive stuff to the clutch, and even -thats- available, and the ecm stuff. other than that, pretty much all the grom 'hot rod' stuff will swap. i would imagine over there in that part of the world, most is driven by the wave 125 market.
 

orbitzor

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Dec 6, 2022
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Another update. I think I added it above but we did confirm the 13T countershaft sprocket for the DAX does fit the 2023. However, the DAX retainer ring for the counter shaft sprocket does not seat correctly so does not work. Honda has apparently not only tapered the counter shaft a little bit but they also adjusted the splines. So, at present there is not a way we can find to change out the front sprocket with stock parts until Honda or someone else makes a retainer ring that both lines up with the bolt holes on the DAX sprocket AND correctly locks in place on the splines. Unless maybe there is another 13T sprocket out there we haven't tracked down that will allow you to use the stock retainer ring that comes on the 2023 CT's.

In the mean time, Eddie went ahead and changed out the rear sprocket to to a 42T which also required changing out to a longer chain. It is a big jump from 38T to 42T size wise. To confirm, it is the sprocket for the Wave that fits the rear.

Immediately noticeable in terms of pull in each gear...not earth shattering but noticeable. Even on small hills, the bike pulled right through them. However, we did a 70+KM ride up into the mountains and even with the larger rear sprocket, a few of the hills had to be done in first gear with most of the rest being painful, but doable in 2nd gear. Admittedly, these are some pretty steep hills but I think the bike would have really struggled without that 42T sprocket to keep enough forward movement to keep from falling over on hills with a 180 degree turn at the same time.

Some other interesting notes. Eddie and Robert (both have the big bore kit and a 42T rear sprocket both weigh close to what i do) could easily blow past me on the hills. My wife, who weighs 38KG's less then me riding on the exact same configuration on her bike as mine struggled WAY less. She was able to keep up with Eddie and Robert for the most part and all 3 had to slow down to keep me with the group. This was so apparent in our debrief that Eddie suggested we wait on a BBK on her bike...her weight difference alone will probably mean she will have the same performance as I do with a BBK on my bike. No surprise weight is a big factor in performance but in the real word it was surprising just how much difference it made. Of course I could always just loose some dam weight too lol. Also, no issues on either bike with ABS for far. Eddie is looking into which BBK we should try with.
 
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