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honda cg no compression

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lozza59
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Joined: 19 May 2011
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PostPosted: 21:16 - 19 Jul 2011    Post subject: honda cg no compression Reply with quote

well i bought an old cg to play with. it was only 10 miles from me and got it with tax and mot for 70 including delivery to the door!
pretty good i think Cool
it does however have an issue.
take a look at pics!
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TUG
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PostPosted: 21:18 - 19 Jul 2011    Post subject: Reply with quote

Ha sweet! I'm jealous! I love CG's and might be holy... but make sure you remove the rest of the debris and they are pretty basic engines anyway. Thumbs Up
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lozza59
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PostPosted: 21:28 - 19 Jul 2011    Post subject: cg Reply with quote

so now you have seen the piston and i am still looking for the head from the valve that went through it Laughing
barrel is fooked too.
amazingly the bottom end turns and im wondering do i really need to split the bottom end to get all the bits out, is there another way to get any bits out that may be in there? i am assuming splitting the bottom end would be normal procedure??
one other part i am after is an inlet rubber from the carb to the engine the style usually found on chinese engines, specifically a hongdou chituma ctm 125, but im quite sure others such as kymco, ajs, yamasaki, skyjet, jialing and other chinese single cylinder cg type motors would be the same as i have a cylinder head but it takes a different inlet rubber. (need one with the mounting holes to the engine facing the ground and the sky not the left and the right if that makes any sense Confused )
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stonesie
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PostPosted: 23:07 - 19 Jul 2011    Post subject: Reply with quote

There is no other way of getting all the bits out, they are alloy so you can't even fish them out with a magnet.


They are such easy engines to work on though, and parts are cheap.
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Ade75
Borekit Bruiser



Joined: 14 Jun 2011
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PostPosted: 00:28 - 20 Jul 2011    Post subject: Reply with quote

I think thats broken Thumbs Up Laughing Bargain though, well found Thumbs Up
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TUG
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PostPosted: 02:20 - 20 Jul 2011    Post subject: Reply with quote

For the sake of it, I would look into how small the oil ways are first and if the oil goes through the strainer before being picked up.

To be perfectly honest with you though, I would split it and clean it out. Its easer with a bike so small like a CG, I wanted to sort my VTR out but no space. Crying or Very sad
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stonesie
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PostPosted: 11:08 - 20 Jul 2011    Post subject: Reply with quote

As it happens I have the piston and barrel from the 150 engine in the shed (standard, used 125 fare) some marks on the piston but should help to get yours up and running, no spare head though...
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lozza59
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PostPosted: 11:40 - 20 Jul 2011    Post subject: Reply with quote

thanks for the info everyone Thumbs Up
looks like im going to be stripping the engine further then...

Quote:
There is no other way of getting all the bits out, they are alloy so you can't even fish them out with a magnet.


this thought did cross my mind but as you say it wont fish the alloy out, checked with the local motorcycle shop that agree with the engine being stripped completely but they thought the bike wasnt worth it Shocked and that a cheap complete engine is the best way.

Quote:
I think thats broken Bargain though, well found

thanks i thought so! full tank of petrol too Very Happy


Quote:
Posted: 12:08 - 20 Jul 2011 Post subject:



As it happens I have the piston and barrel from the 150 engine in the shed (standard, used 125 fare) some marks on the piston but should help to get yours up and running, no spare head though...


sounds interesting, if i can successfully rebuild the bottom end i will look into it Thumbs Up
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Samber
Derestricted Danger



Joined: 15 Jun 2011
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PostPosted: 12:57 - 20 Jul 2011    Post subject: Reply with quote

Is this any use to you? Might be a quick way to get the bike running again.
Seller is nothing to do with me by the way.
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1977 CZ 125 476 series
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mccluskeyd
Two Stroke Sniffer



Joined: 16 Jul 2011
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PostPosted: 19:08 - 20 Jul 2011    Post subject: Reply with quote

The problem with another engine is that the wiring may not be exactly as per the CG's.

Especially if it is a Chinese copy, which mainly use pattern bits from the electric start engines which are slightly different internally than what looks to me as being a pre-Brazil model....?

I would try and put your own engine back together, as if you want to do it the correct way (!!??) you would have to inform DVLA of an engine swap which is often more troublesome than the bike itself. (i.e. they sometimes want proof that a garage did it for you, or a RAC check etc).

As for a head ; breakers are full of them, same with the Carb inlet rubber. You are better sticking to CG stuff, as if you go the Chinese route it may not fit exactly.

Splitting the engines :
You quite often need an impact driver to undo the casing bolts as it may never have been opened. Having someone with you that has done it before is a good idea.
As for the internals ; they are very simple inside, and make sure and have plenty of clean workspace to work on, and label everything as you go.

As for the bike ; it's a cracker at that price ; I love CG's and have had a few, they are brilliant little machines.

All the best,
DMcC.
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Rob Fzs
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PostPosted: 19:18 - 20 Jul 2011    Post subject: Reply with quote

i had a head,but sold it to that ^^ guy lol

yours is a 82' cg so it'll be 6v which is a arse

you could do what i did and put a newer cg engine in and change the loom etc,but its alot of work
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mccluskeyd
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Joined: 16 Jul 2011
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PostPosted: 20:05 - 20 Jul 2011    Post subject: Reply with quote

Aaaaah !!!

Thought you would bring that one up Rob ! Very Happy

And very grateful I was as well....!

All the best,

David.
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Xenocide
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Joined: 17 Aug 2008
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PostPosted: 20:59 - 20 Jul 2011    Post subject: Reply with quote

I've got a paperweight on my desk which is the battered remains of a cg piston. I quite like it. No hole in the top though.

You win.
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lozza59
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PostPosted: 22:38 - 20 Jul 2011    Post subject: Reply with quote

Quote:
Posted: 13:57 - 20 Jul 2011 Post subject:



Is this any use to you? Might be a quick way to get the bike running again.
Seller is nothing to do with me by the way.


thanks for the link but i want to keep it all honda, Very Happy

i thought about making it into a 'cafe racer' style when i noticed it on ebay but as soon as i saw it with all the original bits including the mirrors i decided against it, might go as far as a custom exhaust but not at the expense of the one on it as that doesnt look a week old!
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unitynotsocri...
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Joined: 29 Jun 2011
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PostPosted: 17:41 - 21 Jul 2011    Post subject: Reply with quote

Other posters are right.If you swap for a chinese copy or later cg engine you'll need to change the wiring loom and switchgear.If you restore it as origional you can do the g/box and main bearings,just check the big ends ok before you spend any money on the engine,it would be cheaper replacing it with a second hand one otherwise.
On the plus side they are cheap to rebuil and a good bearing supplier can provide superior bearings cheaper than honda,don't trust cheap bearings.Try brigand engineering for bearings.
Cos its a points model it looks like the timings been wrong and as people abuse em and dont change the oil they can overheat.
The pistons are ally so should 'nt wreck the crank or other steel components much.
One of the last points model,made in brazil i think.If you cafe racer/custom it ,the fork rubbers and shite front drum are the biz.
The pick is one i did'nt finish off.Its got lifan forks and a late 60's rear wheel and front wheel.The standard decals are crap.
This one has a ohc 'norton' engine which is a chinese copy cb/xl engine.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS
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lozza59
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PostPosted: 21:42 - 21 Jul 2011    Post subject: Reply with quote

Quote:
Cos its a points model it looks like the timings been wrong and as people abuse em and dont change the oil they can overheat


im glad you mention this, how do i check/adjust the points?
thanks
also ive been to another bike shop today and they recommend i just get another engine, if i go down this route i will be looking for the later cdi honda cg engine and loom. having said that i do have a cb100 engine, its ohc but should bolt straight in, anyone know if the cg loom would work with it? only as an alternative to buying another honda engine, i have two chinese engines that would go in but i hate those things!
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unitynotsocri...
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Joined: 29 Jun 2011
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PostPosted: 22:14 - 21 Jul 2011    Post subject: Reply with quote

just keep looking for an old scrapper cg engine,before about 79 they were 6 volt electrics but you can swap the coil/flywheel setup.the cb100's have a fancy 'alternator' setup.get a manual or let the grey haired ones at the bike shop set the points unless you want to studey engine design/ignition timing principles.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS
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humanbeing
Renault 5 Driver



Joined: 20 Mar 2011
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PostPosted: 12:04 - 22 Jul 2011    Post subject: Reply with quote

lozza59 wrote:

im glad you mention this, how do i check/adjust the points?
thanks
also ive been to another bike shop today and they recommend i just get another engine

the chinese way to do it cheaply http://www.motoyes.net/bbs/forum.php?mod=viewthread&tid=193561
AB glue the CD70 pickup / some welding / DC CDI (ie. bigger size & a extra red wire) / GY6 rectifier Razz


Last edited by humanbeing on 10:44 - 28 Mar 2012; edited 1 time in total
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lozza59
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Joined: 19 May 2011
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PostPosted: 00:39 - 23 Jul 2011    Post subject: Reply with quote

Quote:
the chinese way to do it cheaply http://www.motoyes.net/bbs/viewthread.php?tid=193561
AB glue the CD70 pickup / some welding / DC CDI (ie. bigger size & a extra red wire) / GY6 rectifier


thats amazing! Thumbs Up
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unitynotsocri...
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PostPosted: 18:21 - 23 Jul 2011    Post subject: Reply with quote

The link shows how to covert it to a cdi.if the engines fckled then its just extra work.get a type 2 cg brazil engine with 12v and points or get a chinese clone cdi with a loom ,simpler cheaper.The external sidecases can be reused so it still says 'Honda'.Not worth doing the engine unless you restore it and then you might as well keep it origional/points/6v electrics to keep its value.

Be wary of mixing chinese/honda engine /gearbox internals as they lots of minor differences.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS
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lozza59
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PostPosted: 23:06 - 23 Jul 2011    Post subject: Reply with quote

thanks for the info everyone but its all done and back together now with original engine, runs sweet enough and ive done 100 miles on it today starts first kick too.
i planned to get another cg engine so for the sake of it i turned the original motor upside down and shook it, flushed with petrol and shook again, i think most/all of the bits are out of it now and the lot works very well. how lucky is that!
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humanbeing
Renault 5 Driver



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PostPosted: 06:00 - 24 Jul 2011    Post subject: Reply with quote

There's also another way to CDI that don't need new pickup & welding http://www.chegongshe.com/News/20074/car_N_412.html BUT Embarassed the "points" need to be in working order
That config is LESSER problem than "pure" form due to no "amp" passing on it BUT the "gap" ...
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unitynotsocri...
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PostPosted: 10:59 - 24 Jul 2011    Post subject: Reply with quote

yeah but you still have to fkkukle about with the gap through the tight fanny on the flywheel so its may be easier but not much.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS
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