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Hi everyone, I’m Brooklin and I’m the owner of a 1996 Honda CG 125. I’ve restored this bike, which was last on the road in 2013. She has MOT and is now my commuter. I’m learning more and more about bikes and these are wicked fun to learn on. I want to get into engine tuning; how can I go about getting more power into these 125’s? I can only find ancient threads saying it’s impossible. Being that it’s 2021 now, I’m hoping for this to of changed. I’d love to add more midrange and torque to my trusty steed so I can keep her. The bike gets me around 3-5 compliments from strangers every time I take her out so I’m not really up for buying a bigger bike that everybody has seen before and nobody appreciates. I like the unique tone that this specific CG has I just want to make her a bit more fun uphill, whilst learning a thing or two about tuning 4 stroke engines. I’m not a 17 year old virgin that is desperately trying to impress every female within a 20 mile radius, I’m a 24 year old grown ass man literally trying to impress myself with a project I’ve put back on the road, she looks like a Cafe Racer so now I just want her to have a bit of stink to suit the look.
Brooklin.
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93fxdl
Posted a lot
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Posts: 1,998
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Aug 10, 2021 12:57:47 GMT
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There are 150 big bore kits available, lot of tuning is done to these in Latin America, so with some work you can get cams for them.
Can use a honda stationary engine piston to make a larger bore engine. Theres also a 250 version available, actually 230cc which often gets used in Cheap quads and dirtbike
Similar to the engine in the skyteam ace, and they are quite into tuning
Ttfn Glenn
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bstardchild
Club Retro Rides Member
Posts: 14,880
Club RR Member Number: 71
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Honda CG 125 1996 Cafe Racerbstardchild
@bstardchild
Club Retro Rides Member 71
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Aug 10, 2021 13:32:10 GMT
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CB250RS engine transplant
I seem to remember the CG125 has quite decent frame clearance even with quite a tall engine
I'm not sure I'd bother with tuning as the cost benefit equation just wouldn't work out
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Aug 12, 2021 20:56:17 GMT
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There are 150 big bore kits available, lot of tuning is done to these in Latin America, so with some work you can get cams for them. Can use a honda stationary engine piston to make a larger bore engine. Theres also a 250 version available, actually 230cc which often gets used in Cheap quads and dirtbike Similar to the engine in the skyteam ace, and they are quite into tuning Ttfn Glenn Thanks for this pal I appreciate the insight, I’m going to look into this. I’m a fair bit worried about the manufacturers. Seems like sacrilege to throw a Chinese-made lump in there after wrenching out the solid Japanese original. Nonetheless you answered the question which was very welcome btw, thanks for the input I’ll let you know what I find. Brooklin. |
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Last Edit: Aug 12, 2021 21:02:03 GMT by bsibley97
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Aug 12, 2021 21:01:48 GMT
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CB250RS engine transplant I seem to remember the CG125 has quite decent frame clearance even with quite a tall engine I'm not sure I'd bother with tuning as the cost benefit equation just wouldn't work out I like the sound of throwing in the Honda lump, bit dubious to if I will be able to find the specific RS version being that its olddddd, but hey I’m going to have a look at that online so that’s a good shout. Can I ask did you specifically choose the RS version to mention due to that being the one that fits or was it because most of the CB engines will fit and that’s just the say the nicest out of the bunch? Thanks for the post mate. Brooklin. |
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bstardchild
Club Retro Rides Member
Posts: 14,880
Club RR Member Number: 71
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Honda CG 125 1996 Cafe Racerbstardchild
@bstardchild
Club Retro Rides Member 71
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Aug 12, 2021 21:31:36 GMT
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CB250RS engine transplant I seem to remember the CG125 has quite decent frame clearance even with quite a tall engine I'm not sure I'd bother with tuning as the cost benefit equation just wouldn't work out I like the sound of throwing in the Honda lump, bit dubious to if I will be able to find the specific RS version being that its olddddd, but hey I’m going to have a look at that online so that’s a good shout. Can I ask did you specifically choose the RS version to mention due to that being the one that fits or was it because most of the CB engines will fit and that’s just the say the nicest out of the bunch? Thanks for the post mate. Brooklin. It’s a big single - had one years ago went very nicely I certainly wouldn’t go down the superdream twin cyl engine as I think that would ruin the lock you have achieved CB250RS was the model code for the bike that ran it - there might have been later versions but the alternative would be xl250 or even xl185 (trial bikes with 4 stroke singles) |
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Aug 13, 2021 11:00:36 GMT
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I think you’re right about that also; separate to the looks that extra exhaust weight wise would be ruining the bike. I can literally pick this thing up so it’s a real laugh. I’ll have another look for a RS version then bud thanks again for that.
Brooklin.
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Aug 25, 2021 15:00:41 GMT
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CB250RS engine transplant I seem to remember the CG125 has quite decent frame clearance even with quite a tall engine I'm not sure I'd bother with tuning as the cost benefit equation just wouldn't work out I like the sound of throwing in the Honda lump, bit dubious to if I will be able to find the specific RS version being that its olddddd, but hey I’m going to have a look at that online so that’s a good shout. Can I ask did you specifically choose the RS version to mention due to that being the one that fits or was it because most of the CB engines will fit and that’s just the say the nicest out of the bunch? Thanks for the post mate. Brooklin. The CB250RS is physically much much bigger as well as being sought after as it also ended up in modified form in the XL and XR range. You can bore and stroke these CG engines out to around a 220cc If you look for information on the ohc versions most of the details are the same. From memory you will need to offset the crank pin and use an XL185 barrel along with either an XR200 or one of the generator pistons. I don't know if anybody who carried out port our valve work on them so I've got no idea what advantages that would bring. |
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Last Edit: Aug 25, 2021 15:01:32 GMT by dodgerover
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Aug 25, 2021 16:21:52 GMT
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The Cg125 engine was designed to run at max revs every where carrying your family and chickens to market.
Once you start trying to tune it bang for buck is a negative equation.
CB250Rs engine is likely to be unobtainium, they also suffered chocolate cam syndrome.
I would keep the engine stock, fit a rortier exhaust and enjoy.
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Needs a bigger hammer mate.......
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Aug 26, 2021 10:57:40 GMT
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The Cg125 engine was designed to run at max revs every where carrying your family and chickens to market. Once you start trying to tune it bang for buck is a negative equation. CB250Rs engine is likely to be unobtainium, they also suffered chocolate cam syndrome. I would keep the engine stock, fit a rortier exhaust and enjoy. The café racer looks great  Agreed on the engine, just throw a nice can on and enjoy it for what it is. You'll end up throwing a lot of money at it and get little in return otherwise. We always referred to the CG as the chicken chaser. I never really liked the CG at the time, early 90s, as I was into racers and owning a Suzi RG125 and an Aprilia AF1 meant the Honda just seemed like the dull option. However, the passing of time has been pretty kind to the CGs of the late 80s era and the simple design has aged well. I'd happily ride one as a daily. |
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