DIY 142 kit...with part numbers...

[Msfitoy]

 

[m in sc]

man that sounds like a royal pain in the ass. i trudged thought he video, nothing was relevant until about 7 minutes in. sort of. Theres been 133 and 143 kits out for ages... and cheap. https://store.hardracing.com/grom-g...o-fuel-controller-no-camshaft-01-05-0316.html

I'm all for DIY but there so many turn key options, i value my time a bit more than that. and there cheaper options out there as well. some good, some garbage.

 

[r80rt]

If I wanted more power, I'd have bought a different bike.

 

[m in sc]

My grom had a 164 kit on it for a LONG time, 2v, and it was really good and, very reliable. going up a hill at 40 mph in traffic is an annoyance. more -usable- power is a great thing (without over doing it). hence why i did the cam in my 125. I can now maintain 50 up a hill i used to struggle with at 42-45. it certainly didnt make it a power house.

 

[r80rt]

If I ride in traffic, I'll definitely use another bike.

 

[m in sc]

.. ok. But most of us will use them on the road to some degree. .02

 

[T-Rev211]

man that sounds like a royal pain in the ass. i trudged thought he video, nothing was relevant until about 7 minutes in. sort of. Theres been 133 and 143 kits out for ages... and cheap. https://store.hardracing.com/grom-g...o-fuel-controller-no-camshaft-01-05-0316.html

I'm all for DIY but there so many turn key options, i value my time a bit more than that. and there cheaper options out there as well. some good, some garbage.

Just found this forum. Thanks for all the info. I see your link for the Takegawa 143cc Big Bore Kit. So can we use any of the Grom Motor kits on the CT125? Are there others in the forum that have done it yet? I see the TB Cam upgrade video, but nothing else yet. I'm a bigger guy with a 30-minute commute. Would love to have a little more power on the hills. If anyone knows what would be the best/most reliable other than keep it stock. I know Honda is Honda. I've worked for a Powerhouse dealership for most of my life.

I would assume changing the cam would be a good idea too. Will I need a fuel mapping setup? Will the Grom ones work? Any videos or links to pages showing other CT125 motor upgrades would be greatly appreciated. Looking forward to being in this group. Can't wait for it to warm up here in Utah.

 

[op46]

Some expats in Thailand have put a larger power kit on/had put on/ the CT125 there and tested with video documentation. Its being done but haven't seen any thing on what will or will not work coming out of Grom setups. Seems like most if not all items may. Sprockets and Cam replacement is first documented on this forum, suspect the 142cc Big Bore might be the next. Bigger oil pump and cooler too? Thailand is a year ahead and have already had a see what you can do to the CT125 one off bike show with some amazing looking bikes. Not sure what the power upgrades might be on those but from the YouTube video post here in another tab there are defiantly power enhancements.

 

[m in sc]

I haven't found any ecm units as of yet. yes heads big bore kits will swap. throttle body setup is a bit different configuration as well. so yes most will swap over. bigger oil pump is a good idea of course as well. no downside to that at all. oil cooler helps too but you should get a cyl with oil ports to do that since the clutch cover doesnt swap you might be able to get by with a bigger injectorif you go big bore. . MY opinion is that unless you are willing to change intake and exhaust you may not see really noteworthy gains. I'm not doing that on this bike, it for sure it could easily be done. .02

 

[m in sc]

well, to backpedal a bit, I have a 143 kit on hand for mine arrived earlier this week, and a pcx150 injector. the flow rate of the pcx injector will do the job fueling wise (as i'm not sure what the stock ct injector flow rate is).. If nothing else, the higher compression piston and few extra cc's will def help maintain power up longer hills, etc. and yes, it will fit right in as a bolt in. that in combination with the efie system i have already, should handle it just fine and make the most out of the cam i have in there as it is. I'll also put in my koso chain tensioner setup as well while i'm in there to round it all out. I'll post progress as I do it. These are all still considered very mild updates in the grom community, and also the most reliable to do. Im not recommending anyone else do it, just stating what i'm going to do to mine. should add 3-4 hp. I'll probably get it dynoed when its all sorted out and tuned just out of curiosity. total cost for all of this is in parts is 200 for the bbk, 70 for the cam, 70 for the chain tensioner set up, 35 for the injector., 25 for the efie... so around 400 bucks.

 

[AZ7000']

Looking forward to the report! Did you do a baseline dyno run?

 

[m in sc]

I didn't, even though i should have. Really not chasing numbers on this one as much as i do on other projects. I'm assuming stock is around 8.5 or so.

 

[AZ7000']

Copy, thanks

I just need a tiny bit more, big hills in most directions from my house, 18mph at the bottom of one and maybe 20 at the top, the other is posted 45 and I can tap at 41ish until it levels out.

 

[m in sc]

the cam and decat made a huge difference already, this should def round it off. when it's sorted and settled I'll take some running vids. as a side note, i noticed yuminashi makes an adjustable cam gear, which i always thought these motors could benefit from. this then allows you to advance or retard an aftermarket cam. by advancing it a few degrees you can increase low end, and it would be a huge help to run an aftermarket one that would typically be more of a high revver help with low end and midrange. cams are cheap overall, and the cam gear was like 18 bucks? + shipping. THAT may suit most on heres needs I'd think. Just my .02.

 

[AZ7000']

So just the cam? No computer or injector? And you pulled the cat with a new pipe? I recall you mentioning just pulling it would be some work?

 

[m in sc]

i remade the headpipe up to the muffler and took a bend out of it as well, and its a few mm bigger.

yes, i used a honda pcx150 injector and an efie unit to aim for 13.5 afr + the cam.


fwiw, the swap is done, it fired right up and sounds great. took about... 4 hours total with dinner in there somewhere. got late so no test ride tonight but did a few heat cycles in the garage varying rpms, it should be really good. need to take a few gentle (15/20) miles to seat rings and let computer learn.. then another ride with same method, then its go time.

 

[AZ7000']

Good to hear, my honda 450x's both have the most favored R cams. Run on a carby though...

 

[m in sc]

test rode to work this morning,(about 9 miles) so far so good. when warmed up took a few stalls to get it to re-learn idle @ full temp (but its good now) & the fi is definitely adjusting well. this ecm seems to apply changes faster than the old school grom/monkey/cub ones do. it certainly has more low end grunt.