CG 125 engine seizure repair or replacement options?

[joss1]

Yesterday, I bought a 2001 CG 125 nostalgia. However, whilst riding it back on the 80 mile trip home the engine seized,(there was no oil in the engine, the dipstick was screwed in so tightly it was impossible to remove without pliers) so after pushing it for two miles I left it at the nearest garage for safe keeping. Now I am £700 out of pocket, with a CG which doesn't work 50 miles away from me. However, I happen to have a written of CG125-W also 2001 in my garage with a working engine. so I have a few questions regarding my predicament.
1. is it possible to get a seized CG engine working again, or is it irreparable?
2. would it be possible to switch the engine from the broken CG ( which works) with the seized engine?
3. Would the above process be legal, and what would the procedure be for initiating such a change?
this entire ordeal has been an expensive and frustrating one, and I look forward to any advice that can be given, especially that which will help me get back on the road.

[andym]

Personally I'd say the seized engine would be repairable, and maybe without the need to strip anything down either

[numpty2]

You could strip the seized just to see what has gone, but don't build you hopes up.

The engine swap would be fairly easy. There are various approaches to the legality issue. You could declare it all, informing DVLA & insurers of the swap, quoting the new engine number, but there will be some charges for this. Or you could forget to tell them, maybe grinding or filing off the engine number on the donor engine just to protect yourself from any problems down the road. After all, it's not like you're fitting a more powerful engine, its just a straight swap. If it was me, I'd file off the number and do it.

[joss1]

[andym]

I know there is going to be a lot of people who would disagree with anything I say here, but what the hell...

I'd be tempted to put some fresh oil in then try to hand crank the engine slowly backwards and forwards (or in a high gear and try pushing it, but don't try to start it) first...

If that doesn't work then try a good spray of WD40 down the sparkplug hole and leave it for about 24 hours and try again....

If that doesn't work then it will probably need stipped down unfortunately. As for what would need repaired, I haven't a clue, you would know that when it was stripped down hopefully

[Kai.Wilson]

Take out a breakdown policy wait 24 hours the claim youve broke down?

That way you'll get take home

Most breakdown polices have 24 to 48 hour inception periods

[joss1]

[Im-a-Ridah]

Engine swap on something like a CG should be pretty easy. At a guess the bolts are probably going to be rusted on, so here's a quote from another thread on removing them:

f a bolt feels like it's going to round off, I take to it with a blowtorch and heat it up, then WD40 it, hit it with a hammer a few times then leave it a while. Then come back, heat it up again, and it usually undoes Thumbs Up

Also, make sure you use a decent spanner which grips the whole bolt/nut, not just the corners. Even spanners as cheap as these will do the job

[Islander]

[jimbob005]

[joss1]

[jimbob005]

[Kickstart]

Hi

With a 4 stroke running out of oil then I would expect the engine to be pretty much wrecked. However the CG might get away with it, being a pushrod engine with a load of roller or ball bearings.

However I would say it would be far easier to swap in the other engine. Then maybe take the seized one to pieces when you are feeling bored.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[joss1]

right, So I delivered the old CG frame and engine to the mechanic who has my bike, and it's now going to be transplanted into the CG. However, the bike the spare engine came from was my old cat B write-off CG 125, so I'm a little worried there may be legal issues with getting the bike back on the road (the engine wasn't damaged, and still works). So how would one declare the engine change legally, and will there be any issues with the cat B engine?
Thanks again, Joss.

[Kickstart]

Hi

Just inform the DVLA of the change of engine number. Cat B just means spares only, so fine to use the engine as a spare part

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[devojunior]

no no no, just put the working engine in the new bike its should take a competant mechanic a few hours at most its a bloody cg then reguarding the engine number change it on the logbook and also the address and they wont charge for the engine swap as they automaically do it when the adresss is swapped then when you get v5 back with new engine number put it back in your address.

[bradh511]

I would have changed cg engine or even swapped barrel and piston over my self playing with a cg engine is like building a Lego house only takes a few mins 40 to redo top end and about 2hrs max to change the engine ... Just hope u don't get screwed to much on labour... Get your blown engine back .. I would get it apart check the conrod then rebore and a piston and barrel and gasket set and all will be good did u not feel the clutch get funny and makes a whining noise when engine oils low my old one befor to end would use 2 or oil on a 40mile run and my Hartford I've even put a whole in piston and that's still going now when mot's out in April I'll have a top end and piston or engine for sale
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Theory 11-10-12 lets hope i get mod 1 and 2 done by the 18th of jan 2013

[bradh511]

I would have changed cg engine or even swapped barrel and piston over my self playing with a cg engine is like building a Lego house only takes a few mins 40 to redo top end and about 2hrs max to change the engine ... Just hope u don't get screwed to much on labour... Get your blown engine back .. I would get it apart check the conrod then rebore and a piston and barrel and gasket set and all will be good did u not feel the clutch get funny and makes a whining noise when engine oils low my old one befor to end would use 2 or oil on a 40mile run and my Hartford I've even put a whole in piston and that's still going now when mot's out in April I'll have a top end and piston or engine for sale
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Theory 11-10-12 lets hope i get mod 1 and 2 done by the 18th of jan 2013

[scarborough_lad]

Well there's a great thread in show and tell about someone who did a few modifications to a CG. How about you head over there and give it a go!

Here's a link https://www.bikechatforums.com/viewtopic.php?t=237889
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'96 Suzuki GS500

[kramdra]

Return to seller. He sold you a bike with no oil, it siezed and could have killed you (..rear wheel locks, slides you under a car...)

I dont belive I would accept "sold as seen" in this case, the fact you only got 30 miles.


How can you trust that the rest of the bike will be safe?

[smegballs]

[joss1]

Regarding the lack of an oil check, we did try to unscrew the dipstick, but it was impossible (we only managed to do it after the engine had gone and another biker turned up, and even then we needed his leatherman pliers before we could actually get the dipstick out. A foolish mistake, but one which I am sure I will never repeat.)

[kramdra]

And how do you know it didnt simply dump the oil or burn it? dumping the oil on your tire could be far worse. The fact is that the seller would have known, been laughing as you failed to check the dipstick, and the failure could have caused you serious injury. If you know where he lives, and he does not know you, then the engine through his window would be a good start although Id personally be demanding for some monies back, assuming you plan to keep it.

Caveat emptor starts imo when you arrive home, unless the seller told you it were un-roadworthy. He is going to do same again to somone else, unless it hurts him.

Ive had a similar experince on my first car, except I did check the oil. It was a burner. Every tank of fuel, it needed new oil, and it took some very hard abuse in the 1.5 years she ran. Although it took more effort to maintain, I had no bad feelings towards the seller, becuase I did get my monies worth from it.

*note* that I use pliers to do up my dipstick. I dont like the idea somone could easily undo it and urinate, for example.