My Chinkie GY125 Project

satelliteone · Nitrous Nuisance Joined: 08 Feb 2007 Karma :

After selling my DTR, I always wanted to polish a turd!

A 2007 Sukida GY125 only done 182 miles from new. Paid 300 Quid!

Idea!. Modding! a 4T sleeper.

Modds.. an long bar in the end can, knocked the plate right out for the restrictor.

Head porting and valve work.

Race CDI.

Expected Power, unknown. but! stated power is 8.2KW 11hp. I rekon about 15-ish.

the day i got it..

https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/B2TvfWkKGrHqVhsEqBUUSPBBMh9geoUqg_12.jpg

https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/B2TvcggWkKGrHqRiEqnOiEWhBMh9gFb_12.jpg

I cant believe how much rust! on the rack/handle bars/yokes/brackets/swing/exhaust .. A good old wire wheel and slap of ronseal gate paint sorted that out! along with wire wool on the rims.. Then a few coats of lacquer. Nasty chrome!
https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/IMGP4311.jpg

https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/IMGP4304.jpg

https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/IMGP4305.jpg

https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/IMGP4312.jpg

engine out

https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/IMGP4302.jpg

https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/IMGP4297.jpg

porting awaaaaaay
reprofiled the valves, ported the inlet and exhaust ports. and matching the manifolds.

now photo bucket crashed.. grrrr

more pix to follow...

satelliteone · Nitrous Nuisance Joined: 08 Feb 2007 Karma :

herulach · World Chat Champion Joined: 19 Apr 2010 Karma :

You're going to rev that to 14k when it's that close to your balls? You're a braver man than I am.
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YBR 125>FZS600

CHR15 · Turbo nutter bastard Joined: 14 Jun 2008 Karma :

14k on a 125 single

expect it to last about 5 minutes.
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Turbocharged drag thing / project death weapon / GK73A
Ste: I'm not entirely sure how you'd go about verbally abusing someone with a potato but I'm sure it's possible.

satelliteone · Nitrous Nuisance Joined: 08 Feb 2007 Karma :

agree.. 14K will destroy the engine. doubt if it will get up there in any case.. i was more intrested in the advance of the ignition, as the original cgi was very retarded. should be a bit more nippy

BenR · World Chat Champion Joined: 23 Jun 2008 Karma :

Appreciate this thread, will be good to see if you can achieve any more power. What are you going to do about fuelling? I would've thought you would need to increase both fuel & air delivery as well doing something with the exhaust?
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Current bikes: suzuki RG125UN wolf. Yamaha MT-07

mysterious_rider · World Chat Champion Joined: 11 Sep 2010 Karma :

Not bad! I'd like to know how this thing performs once you're done.

lewis87 · Scooby Slapper Joined: 24 Jul 2007 Karma :

I doubt it will make 15bhp or get to 14000 rpm. Still cool that you are modding it though and I enjoyed the pics Thumbs Up

I have ridden and worked on someones Kinroad GY125 and it looks like the same bike as this, the engine looks exactly the same.

evoboy · World Chat Champion Joined: 20 Aug 2009 Karma :

The gearing was the main thing we changed on a mates on of these, it took it from some 50mph redline to 60mph.

Thats it

It was terrible in pretty much everyway.

Id be looking into just junking the end can and putting somthing lighter and more free flowing. If i recall, the carb was also tiny.

Ill keep an eye on this thread though as i admire your enthusiasm!

Karma

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Suzuki GT250 x7------- Fazer 600------CB250RS------Aprilia Rally 70----- Bandit 600

APT Motorcycles

nowhere.elysium · The Pork Lord Joined: 02 Mar 2009 Karma :

How far was the ignition retarded on it? I'm curious, given that I've got one of these, and if I could eke even the tiniest bit more out of it on the cheap, I'd be chuffed.

What does the emissions control thing do/how does it do it? Is it just a matter of removing the thing, or would I need to account for that anywhere else (presumably the CDI)?
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'10 SV650SF, '83 GS650GT (it lives!), Questionable DIY dash project, 3D Printer project, Lasercutter project

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

187 Miles?
How the FUCK does a sproket get teeth THAT sharp in so few miles!?!?!
https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/IMGP4311.jpg
Intreguing project though......
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My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'

Ed Case · World Chat Champion Joined: 01 Mar 2009 Karma :

Wotcha gonna call it..........The Grenade ?.

satelliteone · Nitrous Nuisance Joined: 08 Feb 2007 Karma :

oh my oh my so many questions. ..

Teeth! on a cog and the restricted Cdi on a chinki bike.

Teeth looks fine to me !.. do you want me to take a better foto?.

and google a race Cdi for a GY125. or even GY6 engines.

common lads tiz a bit of fun here, not a track day buster.

like i said at the beginning.. All i wanted to do was polish a turd!

satelliteone · Nitrous Nuisance Joined: 08 Feb 2007 Karma :

The emission control, well.. Co2 levels in some counties are very strict for import, the idea is to inject more air into the exhaust system. Cooling the gasses, reducing Co2.

The way these chinkies got around it was to, use inlet pressure to drive a relay valve. Air from out side getting sucked into the exhaust system.

Why u ask is the point, i agree, these carbs are so lean in many cases IMO.

As to the Cdi. Again for importation and legal imports, Power outputs had to be low. The book figures are 8.2Kw on the 125. Only in two ways restriction exists. Exhuast and Cdi. You also forget that the CB125 push rod engine, (the older points) was book figure of 14.6HP. just on the legal requirement of the UK, 11Kw way back in the early eighties.

A bored out CB125(150) single cylinder with better timing can reach 18Hp.

Not a lot you say, against a DTR or KMX gasgas or 2T 125`s. My DTR was around the 18HP just sticking a Dep on it.

The 2T`s are great om a MX track but a 37inch seat hight 36HP 125 in a green lane is mad!. A 4T will keep you alive for longer!.

here is a link to the CDI`s, Gy125,150,200 and the GY6 engines.

https://gokartsusa.com/performancecdigy6150.aspx

https://cgi.ebay.co.uk/POSH-CDI-Bashan-Shineray-GY6-Chinese-200cc-CDI-ATV-/200502735586?pt=UK_Motorcycle_Parts&hash=item2eaee4f2e2

https://www.youtube.com/watch?v=FAl-XM7t218

satelliteone · Nitrous Nuisance Joined: 08 Feb 2007 Karma :

another great site

https://www.monstergy6.com/product_CDI.htm

nowhere.elysium · The Pork Lord Joined: 02 Mar 2009 Karma :

pepperami · Super Spammer Joined: 17 Jan 2010 Karma :

satelliteone · Nitrous Nuisance Joined: 08 Feb 2007 Karma :

ta pepper..

video of removal of the SAI unit.. emission control crap..

https://www.youtube.com/watch?v=KPfmZIsSuKM

satelliteone · Nitrous Nuisance Joined: 08 Feb 2007 Karma :

almost fnished, renewed the engine oil to day, next is the fresh DOT4 in the brakes.

https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/IMGP4376-1.jpg

awating another set of forks. These are pitted.. Grrrr.. Chinky metal

and the sproket looks great to me..

https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/IMGP4377.jpg

CHR15 · Turbo nutter bastard Joined: 14 Jun 2008 Karma :

i think youve put the forks in the wrong way round.

the brake caliper should be between the forks and frame, not on the front.
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Turbocharged drag thing / project death weapon / GK73A
Ste: I'm not entirely sure how you'd go about verbally abusing someone with a potato but I'm sure it's possible.

Carvel · World Chat Champion Joined: 01 Jun 2010 Karma :

satelliteone · Nitrous Nuisance Joined: 08 Feb 2007 Karma :

We have some eagle eyed viewers in the house!.

The forks are pitted, and mr postie is on the way to give me some really good second hand ones, The Ebay parts department sorted that out.

Agreed. iam not sure why they are either carvel. It looks like. some one has damaged them in the first place. The history of the bike, was left in a back garden with loads of small children for quite a while. The marks are pretty uniform horizontal. makes me wonder. Hitting with a stick or somthin. then just left to rust. OR just could be crap metal! But 50 quid to replace!.not too bad.

Yup and they are on the wrong way round too. Also the bottom yoke bolts aint done up yet. It was just temp way of getting the front end sittin proper, while i put the engine back in.

Dont worry, It will be righted..!

Comon mr Postie!.. i want to ride the beast..

satelliteone · Nitrous Nuisance Joined: 08 Feb 2007 Karma :

its finished!.. all i need now is a can of petrol. Wheel it out side. and see if it fires up..

https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/IMGP4411.jpg

https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/IMGP4410.jpg

https://i31.photobucket.com/albums/c357/satelliteone/Sukida%20GY125/IMGP4406.jpg

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

OK, sproket looked rather pointed in first pic.... butr hey-ho... nice to know that they have out-lived the fork-chrome Shocked

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My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'

Glenben92 · Nearly there... Joined: 01 Jul 2010 Karma :

Get it tested and we want reports of performance!
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57 Huoniao HN125-8 - Smile

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99 Yamaha FZS 600 - Wink

Mod 2 Passed - 01/10/2010